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Prof. Bhaskar Roy
IIT Bombay

 
Prof. A M Pradeep
IIT Bombay

 

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  • Introduction to Turbomachineries

  • Axial flow compressors and Fans: Introduction;  Aero-Thermodynamics of flow through an Axial flow Compressor stage; Losses in axial flow compressor stage; Losses and Blade performance estimation; Secondary flows  (3-D); Tip leakage flow and scrubbing; Simple three dimensional flow analysis;

    Radial Equilibrium Equation; Design of compressor blades; 2-D blade section design : Airfoil Data; Axial Flow Track Design;  Axial compressor characteristics;  Multi-staging of compressor characteristics;  Transonic Compressors; Shock Structure Models in Transonic Blades; Transonic Compressor Characteristics;   3-D Blade shapes of Rotors and Stators;   Instability in Axial Compressors; Loss of Pressure Rise; Loss of Stability Margin; Noise problem in Axial Compressors and Fans

  • Axial flow turbines: Introduction; Turbine stage; Turbine Blade 2-D (cascade) analysis Work Done; Degree of Reaction; Losses and Efficiency; Flow Passage; Subsonic, transonic and supersonic turbines, Multi-staging of Turbine; Exit flow conditions; Turbine Cooling; Turbine Blade design – Turbine Profiles : Airfoil Data and Profile construction.

  • Centrifugal Compressors: Introduction; Elements of centrifugal compressor/ fan; Inlet Duct Impeller; Slip factor; Concept of Rothalpy; Modified work done; Incidence and lag angles; Diffuser ; Centrifugal Compressor Characteristics; Surging; Chocking; Rotating stall; Design

  • Radial Turbine: Introduction; Thermodynamics and Aerodynamics of radial turbines; Radial Turbine Characteristics; Losses and efficiency; Design of radial turbine.

  • Use of CFD for Turbomachinery analysis and design.

Sl. No.

Topic/s

 

Number of Lectures

1

Introduction to Turbomachineries

BR & AMP

1

2

 

 

 

 

 

 

Axial flow compressors and Fans

 

17

Introduction

BR

1

A simple two dimensional analytical model

AMP

1

2-D  Losses in axial flow compressor stage

AMP

1 Lec + 1 Tute

Profile Loss and Blade performance estimation

 

1

3-D flows  in Blade passages

 

 

Secondary flows, Tip leakage flow, Scrubbing

AMP

1

Simple three dimensional flow analysis

AMP 1

Full Radial Equilibrium Equation

BR 1

Free-vortex and other 3-D flow theories

BR 1 Lec + 1 Tute
Axial compressor characteristics    

Single stage characteristics

BR 1

Multi-staging of compressor characteristics

   

Multi-spool axial compressor characteristics, LPC, HPC

   
Instability in Axial Compressors AMP 2

Loss of Pressure Rise and efficiency

   

Loss of Stability Margin

   

Rotating Stall and Surge, Modal and spike disturbance

   

Inlet Distortion and Rotating Stall

   

Vibrations and Fatigue

   
Design of compressor blades BR 3

2-D blade section design : Airfoil Design – subsonic, transonic and supersonic  profiles

   

Axial Flow Track Design and Inter-spool duct flow

   

Transonic Compressors  and Shock Structure models in Transonic Blades

   

Transonic Compressor Characteristics

   

3-D Blade shapes of Rotors and Stators in modern compressors

   
Compressor Instability and control AMP 1
Noise problem in Axial Compressors and Fans BR 1
 Solved Examples and Tutorial Problems   2 Tute
3 Axial flow turbines   13

Introduction

BR 1
Turbine stage AMP 3 Lec + 1 Tute

Turbine Blade 2-D (cascade) analysis

   

Work Done, Degree of Reaction, Losses and Efficiency

   

Flow Passage, Exit flow conditions

   
Multi-staging and Multi-spooling of Turbine AMP 1
3-D flows  in Blade passages    

Secondary flows, Tip leakage flow & Inter-spool ducts

   
Free-vortex and other 3-D flow theories BR 1 Lec + 1 Tute
Turbine Blade Cooling BR 2

Turbine Blade design

   

Turbine Profiles : Airfoil Data and Profile construction

BR 2

3-D blade shapes

BR 1
Solved Examples and  Tutorial Problems    
4 Centrifugal Compressors and Radial flow turbines   8 Lec + 2 Tute
Centrifugal Compressors AMP 2 Lec + 1 Tute

Introduction

   

Elements of centrifugal compressor/ fan

   

Inlet Duct and guide vane,  Impeller , Diffuser vanes and vaneless diffusers

   

Slip factor, Concept of  Rothalpy, Modified work done

   

Inlet Incidence and Exit lag angles: Impeller and static vanes

   
Centrifugal Compressor Characteristics AMP 1

Surging, Chocking, Rotating stall

   

Sources of Centrifugal Compressor Losses

   
Design of Centrifugal Compressors BR 2

Design of impellers

   

Design of subsonic and supersonic vaned diffusers, vaneless volutes

   
Radial Turbine BR 2

Introduction

   

Thermodynamics and Aerodynamics of radial turbines

   

Radial Turbine Characteristics

   

Losses and efficiency

   

Design of Radial Turbines

BR 1
5 Use of CFD for Turbomachinery analysis and design BR & AMP 4
Computer aided blade profile generation    
Cascade Analysis ; Periodicity and boundary conditions    

3-D blade generation and 3-D flow analysis

   

Flow track and inter-spool duct analysis and design

   
Total : (Including Tutorials)   44

 

  • A full course in Aerodynamics.


  1. Nicholas Cumpsty, Compressor Aerodynamics, 2004, Kreiger Publications, USA.

  2. Johnson I.A., Bullock R.O. NASA-SP-36, Axial Flow Compressors, 2002 (re-release), NTIS.

  3. El-Wakil, M M; Powerplant Technology, 1984, McGraw-Hill Pub.

  4. NASA-SP-290, Axial Flow turbines, 2002 (re-release), NTIS, USA.

  5. J H Horlock, Axial flow compressors, Butterworths, 1958, UK.

  6. J H Horlock, Axial Flow Turbines, Butterworths, 1965, UK.

  7. B Lakshminarayana; Fluid Mechanics and Heat Transfer in turbomachineries,  1995, USA.

  8. Ahmed F. El-Sayed; Aircraft Propulsion and Gas Turbine Engines; CRC press, 2008.


  1. Oates Gordon C;  Aerothermodynamics of Aircraft Engine Components; AIAA series, 1985.

  2. IGTI/ASME; The design of Gas Turbine Engines Thermodynamics and Aerodynamics (chapter 8 and 10), 2005. 


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