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Thermodynamics by Prasanna Kumar

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Chapter 20

Turbines

LEARNING OBJECTIVES
  • To define the working principle of turbines
  • To state the various methods of classification of turbines
  • To derive an expression for the force on a rotor in terms of fluid velocities and hence determine the work done
  • To derive expressions for work done by a turbine and its efficiency in terms of thermodynamic variables
  • To draw the velocity diagrams for impulse and reaction stages of a turbine
  • To solve numerical problems using velocity diagrams and through steady flow energy equation

20.1 Introduction

A turbine produces work which may be used for generating electricity, for running aircraft, in refrigerating plants etc. Steam turbines, Gas turbines, Freon turbines and Mercury turbines are being used ...

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