Turbo Expo

Turbomachinery Technical Conference & Exposition

Presented by the ASME International Gas Turbine Institute

Phoenix Convention Center, Phoenix AZ, USA

June 17-21, 2019

June 18-20, 2019


Program - Workshops


Consider attending one of the workshops and take advantage of the LOW registration fee. Registration will be available online. **Subject to cancellation if the minimum number of registrations is not achieved. Must register by April 22, 2019.

WORKSHOP 1 –  Physics-Based Modeling of Gas Turbine Secondary Air Systems

Sunday, June 16
8:00 am – 5:00 pm
Cost: $300 per person

In gas turbines used for power generation and aircraft propulsion, the main flow paths of compressors and turbines are responsible for the direct energy conversion. To ensure acceptable life (durability) under creep, LCF, and HCF from operational transients causing high temperatures and their gradients in critical engine components, around 20% of the compressor air flow is used for cooling and sealing. This is analogous to blood, water, and air flow within a human body for its proper functioning. The main thrust of this workshop is to develop a clear understanding of the underlying flow and heat transfer physics and the mathematical modeling of various components of gas turbine secondary air systems (SAS). In addition to developing a clear understanding of the key concepts of thermofluids, the workshop will discuss vortex, windage and disk pumping in rotor/stator cavities, centrifugally-driven buoyant convection in compressor rotor cavities, pre-swirler systems, multiple reference frames, hot gas ingestion and rim sealing, and whole engine modeling (WEM) using nonlinear multisurface forced vortex convection links with windage in a layered approach. Additionally, the workshop will provide a design-friendly overview of rotating compressible flow network methodology along with robust solution techniques, physics-based post-processing of 3-D CFD results, and the generation of entropy map for design optimization. A number of design-relevant examples will also be presented in the workshop.

Notes: Five complimentary, autographed copies of Gas Turbines: Internal Flow Systems Modeling (Cambridge Aerospace Series) will be distributed among workshop attendees using a random draw.

Learning Objectives

  • Develop a strong foundation in flow and heat transfer physics of various components of gas turbine secondary air systems
  • Develop an intuitive understanding of 1-D compressible duct flows under the coupled effects of area change, friction, heat transfer, and rotation
  • Gain knowledge in developing accurate physics-based and solution-robust secondary air flow network models
  • Gain knowledge in detecting input and modeling errors in their flow network models
  • Interpret results from their models for design applications.
  • Develop skills to hand-calculate results to perform sanity-checks of predictions by design tools as well as to validate these tools during their development and continuous improvement
  • Improve your engineering productivity with reduced design cycle time


8:00 – 10:00 am
Module 1: An Overview of Secondary Air Systems
  • Role of Secondary Air Systems (SAS) modeling in gas turbine design engineering
  • The concept of physic-based modeling
  • Key components of SAS
  • Flow network modeling and robust solution techniques
  • Role of 3-D CFD in SAS modeling
  • Physics-based post-processing of CFD results
  • Entropy map generation and application
10:00 – 10:15 am Coffee Break


10:15 am – 12:00 pm
Module 2: Special Concepts of Secondary Air Systems – Part I

  • Free vortex
  • Forced vortex
  • Rankine vortex
  • Windage
  • Compressible flow functions
  • Loss coefficient and discharge coefficient for an incompressible flow
  • Loss coefficient and discharge coefficient for a compressible flow

12:00 pm – 1:00 pm Group Lunch

1:00 – 2:00 pm    
Module 3: Special Concepts of Secondary Air Systems – Part II


  • Euler’s turbomachinery equation
  • Rothalpy
  • Multiple reference frames
  • Pre-Swirler system
  • Rotor disk pumping                                

2:00 – 3:00 pm  
Module 4: Physics-Based Modeling – Part I

  • Stationary and rotating orifices and channels
  • Rotor-stator and rotor-rotor cavities
  • Windage and swirl distribution
  • Centrifugally-driven buoyant convection in compressor rotor cavity with and without bore flow

3:00 – 3:15 pm Coffee Break

3:15 – 4:00 pm  
Module 5: Physics-Based Modeling – Part II

  • Hot gas ingestion
  • Turbine rim sealing
  • Coupling with rotor-stator cavity purge flow and windage

4:00 – 5:00 pm  
Module 6: Physics-Based Modeling – Part III

  • Whole engine modeling (WEM)
  • Multisurface forced vortex convection link with windage
  • Junction treatment in the network of convection links
  • Layered flow network modeling methodology
  • Key recommendations on SAS modeling

Earn 7 Professional Development Hours (PDH’s) and receive a certificate of completion!

Dr. Bijay (BJ) K. Sultanian, PhD, PE, MBA, ASME Life Fellow
Dr. Bijay Sultanian is an international authority in gas turbine heat transfer, secondary air systems, and Computational Fluid Dynamics (CFD). Dr. Sultanian is Founder & Managing Member of Takaniki Communications, LLC, a provider of high-impact, web-based, and live technical training programs for corporate engineering teams. Dr. Sultanian is also an Adjunct Professor at the University of Central Florida, where he has been teaching graduate-level courses in Turbomachinery and Fluid Mechanics since 2006. During his 30+ years in the gas turbine industry, Dr. Sultanian has worked in and led technical teams at a number of organizations, including Allison Gas Turbines (now Rolls-Royce), GE Aircraft Engines (now GE Aviation), GE Power Generation (now GE Power & Water), and Siemens Energy (now Siemens Power & Gas). He has developed several physics-based improvements to legacy heat transfer and fluid systems design methods, including new tools to analyze critical high-temperature components with and without rotation.

During 1971-81, Dr. Sultanian made landmark contributions toward the design and development of India’s first liquid rocket engine for a surface-to-air missile (Prithvi) and the first numerical heat transfer model of steel ingots for optimal operations of soaking pits in India’s steel plants.

Dr. Sultanian is a Life Fellow of the American Society of Mechanical Engineers, a registered Professional Engineer in the State of Ohio, a GE-certified Six Sigma Green Belt, and an Emeritus Member of Sigma Xi, The Scientific Research Society. He is the author of three graduate-level textbooks: Fluid Mechanics: An Intermediate Approach, published in 2015; Gas Turbines: Internal Flow Systems Modeling (Cambridge Aerospace Series), published in 2018; and Logan’s Turbomachinery: Flowpath Design and Performance Fundamentals, to be published in 2019.

For the ASME Turbo Expo 2019, he is the Heat Transfer Committee Point Contact, a role he also had for Turbo Expos 2013, 2016, 2017, and 2018.

Dr. Sultanian received his BTech and MS in Mechanical Engineering from Indian Institute of Technology, Kanpur and Indian Institute of Technology, Madras, respectively. He received his PhD in Mechanical Engineering from Arizona State University, Tempe and MBA from the Lally School of Management and Technology at Rensselaer Polytechnic Institute.

WORKSHOP 2 –  Basic Gas Turbine Metallurgy and Repair Technology Workshop

Sunday, June 16
8:00 am – 5:00 pm
Cost: $300 per person

This workshop will explain superalloy metallurgy as it applies to gas turbine components. We will look at component damage experienced from gas turbine service exposure and the techniques used to analyze the remaining life of components removed from service. We will compare and contrast protective coatings, component repair technologies, and repair quality assurance techniques. The workshop includes many case study examples, and the last section is devoted to a workshop where attendees develop component repair solutions. Participants may submit questions in advance regarding repair issues faced in their jobs.

Who should attend: GT repair shop personnel, GT designers and technical staff, Operations and maintenance engineers and technicians responsible for gas turbine component repairs, and insurance companies.

Earn 7 Professional Development Hours (PDH’s) and receive a certificate of completion!

Douglas Nagy is the manager of component repairs at Liburdi Turbine Services in Canada, where he manages industrial gas and steam turbine component repairs and provides guidance to research, metallurgy, and development engineering groups. He has 25 years of extensive experience in the analysis of industrial and aero gas turbine components, failure analysis, wear and friction research, high temperature gas turbine component inspection, condition assessment, superalloy metallurgy, and development of coatings and repair processes.

Doug lectures on superalloys and metallurgy at university and commercial levels. He is a part time instructor at McMaster University, supervising undergraduate and graduate student projects and theses. He has also served as expert witness on turbine component condition assessment, failure analysis, and metallurgy.

An experienced speaker, Doug has presented at numerous conferences and seminars such as the ASME/IGTI Turbo Expo, ASM Materials Solutions Conference, Various Gas Turbine User Meetings, Gas Turbine Users Symposium, and ASME International Gas Turbine & Aeroengine Technical Congress. Doug is co-author of numerous technical papers on repairs of gas turbine components as well as coating design and application in publications such as Surface and Coatings Technology, Surface Engineering, Journal of Engineering for Gas Turbines and Power, and SAMPE Journal of Advanced Materials.

His professional affiliations include the Professional Engineers of Ontario (Canada), the American Society of Mechanical Engineers (ASME), and ASM International.

Dr. Warren Miglietti is currently the President of Miglietti and Associates, based in Kansas City, Missouri. Prior to this he was Director of Repair Technology at ProEnergy based in Sedalia, Missouri. In addition he worked at the Reconditioning dept at PSM, (a wholly owned subsidiary of Alstom) initially as a Principal Engineer and later as a Technical Expert.

He worked at PSM for 7 years, after working 5 years at GE’s Repair Development Center. Prior to this he worked 5 years for Sermatech International both as a component repair engineer and as a process repair engineer. His principal responsibility is the development of novel repair techniques and processes for components, operating in advanced land based gas turbine engines, such as the Frame 7/9FB, Frame 7/9FA+e, GT24/26 and W501F/M501F engines. He has 30 years of experience and expertise in the Arc Welding, Electron Beam Welding, Laser Beam Welding, Plasma Arc Welding, Narrow Gap Brazing, Wide Gap Diffusion Brazing, Fluoride Ion Cleaning (FIC), Acid Stripping and Heat Treatment of Nickel and Cobalt base superalloys, as well as Titanium, Aluminum and Stainless Steels.

Since University graduation (B.Sc and M.Sc from University of Natal-Durban, South Africa and Ph.D from University of Pretoria-South Africa) Warren’s career has focused on developing repair techniques and processes for turbomachinery components for industrial, aircraft and aero-derivative components. In South Africa he focused on repair of aviation and military components; whereas in the USA, it has focused more on the IGT side of the business. Warren continues to support the industry as chairman of the Commission XVII – “Brazing and Diffusion Bonding” of the International Institute of Welding (IIW). He was past chairman of the Manufacturing, Materials and Metallurgy Committee of IGTI. Warren has supported this organization for over 25 consecutive years. He has also authored or co‐authored the publication of 47 technical papers and has 12 repair technology patents granted and has 1 repair technology patents pending. He was won numerous awards from the American Welding Society (AWS), German Welding Society (DVS), American Society of Mechanical Engineers/International Gas Turbine Institute (ASME/IGTI) and (International Institute of Welding (IIW), including a few Best Paper Awards.

WORKSHOP 3 –  Gas Turbine Aerothermodynamics and Performance Calculations

Sunday, June 16
8:00 am – 6:00 pm
Cost: $300 per person

This interactive workshop introduces in 1 day carefully selected essential material on gas turbine aerothermodynamics and performance calculations. The pedagogical treatment with illustrative examples, flavored with practical considerations, will make the workshop comprehensible, interesting, and useful to both early career and experienced engineers. After completing the course the participants will have the knowledge to propel themselves in studying other gas turbine and turbomachinery topics.

  • Principle of thrust generation: propulsive, thermal, core, transmission, and overall efficiencies; SFC to overall efficiency relationship; gross and net thrust. Calculated propulsive efficiencies of propeller, transport and military turbofans, and supersonic cruise vehicles. Practical considerations in selecting bypass ratio.
  • Essential aerothermodynamics applied to gas turbine engines: Review of thermodynamic concepts including enthalpy, entropy, and variable specific heats toward understanding cycle analysis. Illustrative cycle analyses of both aircraft and industrial engines. Use of thermodynamic tables and turbine cooling flow accounting. Compressible flow review including conservation equations, nondimensional parameters including total to static relationships, mass flow function and impulse function. Concept of choking. Nozzle and diffuser analysis with illustrative examples in spreadsheet format including C/D nozzle.
  • Non-dimensional gas turbine and turbomachinery parameters. Advantage of generalized presentation. Maps used in aircraft and industrial engine models.
  • Overview of turbomachinery aero design. Energy transfer in a generalized turbomachine; Euler equation; illustrative example. Compressor stage velocity diagram showing the benefits from variable IGV and stators; conversion of velocity diagram parameters into thermodynamic parameters; radial equilibrium equation and its use in blading design; work coefficient, pressure coefficient, isentropic efficiency, polytropic efficiency, and degree of reaction; stage characteristics and development of overall map; illustrative examples of stage design; variable IGV/stators in constant speed industrial compressor; tip clearance effects, operability summary, and stall margin audit. Turbine stage velocity diagram analysis; work coefficient, pressure coefficient, isentropic efficiency, polytropic efficiency, and degree of reaction; Smith’s turbine efficiency correlation and its adjustments for tip clearances and cooling flows; chargeable and non-chargeable cooling flows; illustrative examples including one showing blade twist in a free vortex design; Overall turbine maps
  • Overview of Combustor Characteristics: Multidisciplinary design requirements; flow path through aviation and industrial combustors; emission reduction with premixing; pressure loss; combustion efficiency; stability, and pattern factor.
  • Component Matching and Integrated System Performance: Requirement to satisfy conservation laws; Design point & off-design calculations; compressor/turbine matching; illustrative examples of turbojet and turbofan in a spreadsheet format showing key iterations
  • Multivariable solver: Newton’s 1-D method; multidimensional Newton-Raphson iteration; application to a mixed flow turbofan; model/data matching
  • Performance enhancement of subsonic turbofans: High bypass ratio benefits; mixed flow turbofan; on-line control optimization; ejector/engine/nacelle integration for increased installed thrust.
  • Hybrid cycles used for power generation: Flowpath schematics and cycle performance(SFC & Specific Power) of combined cycle, cycles with steam ingestion, aeroderivatives with regeneration and intercooling, cycles with reheat.

Learning Objectives
  • Introduce participants with major topics in gas turbine performance of both aircraft engine and industrial gas turbines including review of relevant aerothermodynamics and cycle analysis with illustrative problems
  • analyze turbomachinery velocity diagrams and relate those to thermodynamic parameters; appreciate the usefulness of the degree of reaction and the radial equilibrium equation. Understanding facilitated with illustrative examples.
  • comprehend the discipline of operability and combustor characteristics
  • analyze cycle analysis problems on integrating the component performances to get the overall engine performance including compressor/turbine matching, design point and off-design calculations, and multivariable solver with capability to match model to test data. Understanding facilitated with illustrative examples.
  • Present methods of performance enhancement of subsonic turbofans including analysis
  • Hybrid gas turbine cycles used in power generation


Who should attend: undergraduate & Graduate; Early Career and Experienced; Gas Turbine and turbomachinery design, performance, applications, and education.

Items to bring: Laptop to be brought by each registrant would allow access to the illustrative examples in excel spreadsheets provided with the course notes on a flash drive

Earn 8 Professional Development Hours (PDH’s) and receive a certificate of completion!

Syed Khalid, President, Gas Turbine Systems Solutions, LLC
In addition to a strong analytical background, the instructor has extensive experience in performance, controls, operability, installation aerodynamics, and systems integration at Pratt & Whitney, GE, Rolls-Royce, and Lockheed Martin. He is a recipient of numerous industry and professional society awards. He is inventor/co-inventor of 20 issued patents and 3 pending patents. His publications include 15 technical papers and has made many oral presentations. The instructor has infused in the workshop public domain industrial considerations to increase the practical value.

WORKSHOP 4 –  Primer on Gas Turbine Power Augmentation Technologies

Sunday, June 16
8:00 am – 5:00 pm
Cost: $300 per person

A comprehensive overview covering analytical, experimental, and practical aspects of the available gas turbine power augmentation technologies including a systematic approach of selecting a suitable power augmentation technology for a given application is provided. Importance of CFD analysis in case of specific technology is included. Case studies of actual implementation of discussed power augmentation technologies and lessons learned from these applications are included in the course. A significance of techno-economic evaluation and weather data analysis while selecting a suitable augmentation technology is discussed using a practical case.

Topics also include:

  • Basics of available power augmentation technologies includes: wet-media evaporative cooling, high pressure fogging, overspray/wet compression, steam injection, refrigerated inlet cooling (vapor compression, absorption refrigeration, and thermal energy storage), dry air injection, humid air injection and hybrid power augmentation systems
  • Importance of proper weather data collection and analysis and its impact on power augmentation technologies and power boost achievable
  • Practical considerations in implementing discussed power augmentation technologies
  • Advantages and limitations of discussed power augmentation technologies
  • Operational and maintenance considerations


Who should attend: Engineers with EPC (Engineering, Procurement & Constructions) companies involved in power generation projects, power generation project developers, combined heat & power project developers, gas turbine users, gas turbine operators, consultants involved in gas turbine based power generation projects, and young engineers looking for careers in gas turbine based power generation and related technologies.

Earn 7 Professional Development Hours (PDH’s) and receive a certificate of completion!

Dr. Rakesh Bhargava is Founder & President of Innovative Turbomachinery Technologies Corp. His expertise includes applications of gas turbines and other rotating and reciprocating machines and packaged process equipment used in the off-shore, refinery, power generation, chemical, and pipeline industries. His more than 35 years of experience encompasses inspection and design reviews of process machinery and packaged equipment, evaluation and analysis of gas turbine power augmentation technologies, field problems resolution, failure analysis, inspection of turbomachinery component repairs, technical expertise in commercial disputes involving rotating machines and the global energy market analysis. He has given numerous invited lectures on gas turbine technologies and energy market around the world and provides customized training courses on rotating machinery and related topics. He is an active member of API Committee on Standards on Mechanical Equipment and has participated in upgrades of number of API specifications. He is a Fellow and Associate Fellow of ASME and AIAA, respectively and is past Chair of the ASME/IGTI Industrial & Cogeneration Committee and Oil & Gas Applications Committee. He is Associate Editor of the ASME Journal of Engineering for Gas Turbines and Power.

Dr. Mustapha Chaker is a leading authority in the area of gas turbine power augmentation having done pioneering work on the inlet fogging while being director of R&D at Mee Industries, one of the leading suppliers of power augmentation systems. He has conducted extensive analytical and experimental studies utilizing a wind tunnel and state of the art laser measurement system to evaluate the behavior of cooling systems. He has been also working on the thermodynamic modeling of gas turbines and the use of CFD methods for fogging and wet compression system design and optimization. In addition, he has over 25 years of experience in multidisciplinary skills including gas turbine power generation and mechanical drive, compression systems (centrifugal, axial, integrally geared, reciprocating, steam turbine…) and LNG application. He is currently working as Principal Turbomachinery engineer at McDermott. He is past chair of the Industrial and Cogeneration Committee. Dr Chaker has a Ph.D. in Engineering Sciences from the University of Nice – Sophia Antipolis in France. He is a fellow of the American Society of Mechanical Engineering.

WORKSHOP 5 –  Introduction to Probabilistic Analysis and Uncertainty Quantification

Sunday, June 16
8:00 am – 12:00 pm
Cost: $200 per person

Uncertainty is an inescapable reality that can be found in nearly all types of engineering analyses. It arises from sources like measurement inaccuracies, material properties, boundary and initial conditions, and modeling approximations. Uncertainty Quantification (UQ) is a systematic process that puts error bands on the results by incorporating real world variability and probabilistic behavior into engineering and systems analysis. UQ answers the question: what is likely to happen when the system is subjected to uncertain and variable inputs. Answering this question facilitates significant risk reduction, robust design, and greater confidence in engineering decisions. Modern UQ techniques use powerful statistical models to map the input-output relationships of the system, significantly reducing the number of simulations or tests required to get accurate answers.

This four-hour workshop introduces probabilistic and Uncertainty Quantification methods, benefits, and tools and illustrates these concepts with case studies.

Learning Objectives

  • Knowledge of common UQ and probabilistic methods
  • How to apply UQ methods to an engineering system
  • How to use UQ techniques to drastically save design time
  • How to develop a robust and reliable design with UQ techniques
  • Hot to interpret UQ results when making decisions

  • Introduction to UQ
  • Motivation for using UQ
    • Commercial – Return on Investment
    • Regulatory – FAA and DoD
  • Best Probability and Statistics
  • UQ Methods
    • Design of Experiments
    • Gaussian Process
    • Polynomial Chaos Expansion
    • Model Calibration
    • Sensitivity Analysis
    • Uncertainty Propagation
  • Benefits
  • Case Studies
  • Final Remarks


Who should attend: engineers, program managers, and data scientists who are familiar with probabilistic analytics and want to further investigate how Uncertainty Quantification can maximize insight, improve design, and reduce time and resources. Earn 4 Professional Development Hours (PDH’s) and receive a certificate of completion!

Dr. Mark Andrews, UQ Technology Steward, is responsible for advising SmartUQ on the industry’s UQ needs and challenges and is the principal investigator for SmartUQ’s project with Probabilistic Analysis Consortium for Engines (PACE) developed and managed by Ohio Aerospace Institute (OAI). He recently received the award for best training at 2018 the Conference on Advancing Analysis & Simulation in Engineering (CAASE). Dr. Andrews is a member of the Probabilistic Methods, a subcommittee of Structures & Dynamics committee for ASME Turbo Expo. Before SmartUQ, Dr. Andrews spent 15 years at Caterpillar.

Mr. Zachary Graves, UQ Applications Engineer

WORKSHOP 6 –  Design and Simulation for Turbomachinery Additive Manufacturing

Sunday, June 16
8:00 am – 12:00 pm
Cost: $200 per person

Learning Objectives

  • Opportunities and Challenges Metal Additive Manufacturing presents for Turbomachinery.
  • How to Design a component for additive manufacturing (including lightweighting)
  • How to get the print for a component the first time

  • Introduction and Promise of Metal Additive manufacturing
  • Design to Print workflow. Details of each step in the workflow
  • Lightweighting- Topology Optimization, design validation
  • Print Process Setup and Simulation


Earn 4 Professional Development Hours (PDH’s) and receive a certificate of completion!

Jeff Bronson is Senior Additive Manufacturing Expert and Sunil Patil is Industry Lead for Turbomachinery at ANSYS. Both of them have worked at Aircraft Engine Manufacturing OEMs before joining ANSYS where they supported various design and analysis aspects of modern and next generation jet engines. Jeff has extensive knowledge of whole metal Additive manufacturing workflow from Design to print to microstructure analysis and has been acting as advisor to Jet Engine, Gas Turbine OEMs and other organization in Turbomachinery field.

Sunil Patil ANSYS Industry Lead – Turbomachinery



WORKSHOP 7 –  Advancements in Turbomachinery Development for Electric Propulsion

Sunday, June 16
8:00 am – 12:00 pm
Cost: $200 per person

The objective is to provide engineers with the understanding required to take on the next aerospace step toward electrification and optimization of turboelectric and hybrid propulsion systems. Design considerations given flight missions are undertaken before delving into off-design performance prediction.

Basics of gas dynamics and fluid properties, Brayton cycles and/or electric propulsion combinations and architectures for aircraft engines, Specialized theoretical background and terminology, Review of electric propulsion architectures, Design requirements and constraints associated with electric propulsion fans for different flight missions, Overview of axial and mixed flow fans and their practical application, Case studies, Fan noise estimation techniques, Optimization of fan under given constraints, Off-design assessments of designed fan

Who should attend: Engineers working on electrical propulsion and turbomachinery design, modifications, or upgrades. Engineers, Scientists, and Managers beginning or advancing in design and analysis of turbomachines. Program Managers who want to bring new design capabilities in-house. Engineering students looking to expand their knowledge and/or work in electric propulsion.

Earn 4 Professional Development Hours (PDH's) and receive a certificate of completion!

Clément Joly is a Lead Engineer at SoftInWay and has been with the company since January 2013. He received his Master’s Degree in Mechanical & Aerospace Engineering from Polytech Orleans in France while doing part of his education at Wichita State University in Kansas (USA). Mr. Joly specializes in steam and gas axial turbines, cycle design and analysis as well as waste heat recovery and supercritical CO2 technologies. He teaches courses on fundamentals of turbomachines as well as design workshops using the AxSTREAM® platform.

Abdul Nassar is Managing Director at SoftInWay.

Rotor Dynamics Analysis and Bearing Design for High Speed Turbochargers/Generators

Sunday, June 16
8:00 am – 12:00 pm
Cost $200 per person

This proposal concerns a workshop on rotordynamics and bearing design of high-speed turbochargers, turbines, generators, and other machines. The authors have extensive industrial and bearing design issues. The objective is for attendees with interest in such machines can view some advanced methodology and example rotor dynamics and high-level bearing design which may help them in their work.

For example, medium size turbochargers for diesel engines or reciprocating compressors normally employ radial and thrust fixed pad bearings to keep costs low. They often operate near or above the radial bearing linear stability threshold, in the 20,000 rpm to 50,000 rpm range, due to fixed pad bearing effects. It is useful to employ both linearized and nonlinear rotor bearing modeling to evaluate the optimum bearing configurations. Often, one of the best radial bearing options is the semi-floating bush bearing, consisting of an inner fixed pad bearing and squeeze film damper. The workshop will provide example turbocharger and similar machines evaluating radial bearing orbits, FFT spectrum analysis of the orbits, required oil flow, power loss evaluation of inner bearing plus squeeze film damper, temperature and other parameters. The effects of bearing parameters are evaluated and compared. Example results similar to turbochargers will be presented.

Another important factor is the thrust bearing to take the high loading associated with centrifugal impellers in turbochargers and similar high-speed machines. Again, fixed pad thrust bearings are employed. It is quite important to evaluate typical fixed pad thrust bearings for pressures, load capacity, oil viscosity, temperature, power loss and other effects at high speeds. The proper evaluation of the thrust bearing requires a 2-D Reynolds equation pressure solution with turbulent effects as well as a 3-D finite element thermal model of the oil film, thrust pads and thrust runner with proper heat flow matching across the fluid/solid boundaries. An important effect is the loss of oil film viscosity due to high oil film heating and the subsequent loss of load capacity. Example results similar to industrial turbochargers will be presented.

Who should attend: Design engineers, manufacturing engineers, engineers involved in high speed machinery, particularly medium sized turbochargers for diesel engine applications, generators, and turbines which often use fixed pad bearings for cost regions. Often they do not have extensive experience in rotor dynamics and design.

Paul Allaire, Chief Technology Officer, Rotor Bearing Solutions International
Saeid Dousti, Senior Technical Fellow, Rotor Bearing Solutions International
Jianming Cao, Vice President, Rotor Bearing Solutions International
Timothy Dimond, President, Rotor Bearing Solutions International