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Course Detail

Course Name Turbomachinery
Program B. Tech. in Mechanical Engineering
Year Taught 2019


Unit 1

Definition and Classification of turbomachines – Specific Work – T-s and h-s Diagram – Incompressible and compressible flow – Losses – Total–to–Total efficiency – Total-to-Static efficiency – Effect of reheat and preheat factor. Degree of reaction. Energy transfer – Euler’s equation, velocity triangles.

Dimensional analysis, Dimensionless parameters and their physical significance, specific speed, Hydraulic Pumps: Centrifugal Pumps – Some definitions – Pump output and Efficiencies – Effect of Vane angle – Cavitation – Pump Characteristics – Multistage pumps.

Unit 2

Hydraulic Turbines: Classification of hydraulic turbines – Velocity triangles. Efficiencies of draft tubes – Hydraulic turbine characteristics. Francis and Kaplan turbines – Velocity triangles – Efficiencies of Draft tubes – Turbine characteristics.

Elementary cascade theory, cascade nomenclature, compressor cascade, turbine cascade, cascade efficiency. Dimensional analysis of compressible flow machines, stalling and surging.

Unit 3

Centrifugal Compressors: Constructional details – Stage Pressure rise – Stage Pressure Coefficient – Stage Efficiency – Degree of Reaction – Various Slip factors – Introduction to Fans and Blowers, Working principle, Fan laws, Performance Characteristics.

Axial flow Compressors: general expression for degree of reaction; velocity triangles for different values of degree of reaction, Blade loading and flow coefficient, Static pressure rise, Workdone factor.

Steam and Gas Turbines: Axial turbine stages – Stage velocity triangles – Work – Single stage impulse turbine – Speed ratio – Maximum utilization Factor – Compounding of Turbines and its types, Degree of Reaction – Reaction Stages. Inward Flow radial turbine stages (IFR) – Working principle and Performance Characteristics.

Text Books

  • Dixon S. L. – ‘Fluid Mechanics & Thermodynamics of Turbomachinery’ – Elsevier – 2012 – 6th Edition
  • Sayers A. T. – ‘Hydraulic and Compressible flow Turbomachines’ – McGraw Hill -1992
  • Yahya S. M. – ‘Turbines, Fans and Compressors’ – Tata McGraw Hill Publishing Company Limited – 2002


  • Douglas J. F., Gasiorek J. M. and Swaffield J. A. – ‘Fluid Mechanics’, – Addison-Wesley – 1999
  • Kadambi V. and Manohar Prasad – ‘Energy Conversion – Vol.III: TurboMachinery’ – New Age International Publishers – 1999
  • Church A. H. and Lal J. – ‘Centrifugal Pumps and Blowers’ – Metropolitan – 1995

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