Course Title: 
Year Taught: 
Undergraduate (UG)
School of Engineering

'Turbomachinery' is a course offered in the B. Tech. in Mechanical Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham.

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.

  • 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