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Course Detail

Course Name Turbo Machinery
Course Code 19MEE355
Program B. Tech. in Mechanical Engineering
Year Taught 2019


Unit 1

Definition and Classification of turbo machines – 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, Work done 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.

Objectives and Outcomes

Course Objectives

  • To classify the turbo-machines based on energy interactions
  • To study the performance characteristics of turbo-machines under different operating conditions
  • To inculcate knowledge in the thermal design of turbo-machines

Course Outcomes

  • CO1: Compare the features and working of various turbomachines
  • CO2: Apply the concepts of energy transformation in turbo machines
  • CO3: Analyse the performance of Hydraulic pumps and turbines
  • CO4: Design and evaluate the critical parameters involved in power generation
  • CO5: Evaluate the performance of axial and centrifugal compressors

CO – PO Mapping



CO1 3 3 3
CO2 3 3 3
CO3 3 3 1 3
CO4 3 3 1 3
CO5 3 3 1 3

Textbook / References


  • Yahya S. M. “Turbines, Fans and Compressors”,4/e,Tata McGraw Hill Publishing Company Limited ,2011.


  • Dixon S. L. “Fluid Mechanics & Thermodynamics of Turbomachinery”, 6/e, Elsevier, 2012.
  • Douglas J. F., Gasiorek J. M. &Swaffield J. A. “Fluid Mechanics”, Addison-Wesley, 1999.
  • Valanarasu.A. “Turbo machines”, 2/e, Vikas publishing house private limited, 2001.

Evaluation Pattern

Assessment Internal External
Periodical 1 15
Periodical 2 15
*Continuous Assessment (CA) 20
End Semester 50
*CA – Can be Quizzes, Assignment, Projects, and Reports.

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