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Basic Concepts in Turbomachinery

Basic Concepts in Turbomachinery
3.8 (26 reviews) Read reviews
ISBN: 978-87-7681-435-9
1 edition
Pages : 144
Price: Free

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This book is about the fundamentals of turbomachinery, the basic operation of pumps, aircraft engines, wind turbines, turbomachinery for power generation and hydro-electric machines.

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About the book

  1. Reviews
  2. Description
  3. Preface
  4. Content
  5. About the Author


Boanerges( ★★★☆☆

It's an interesting book.


This book is about the fundamentals of turbomachinery, the basic operation of pumps, aircraft engines, wind turbines, turbomachinery for power generation and hydro-electric machines. It compliments courses that you will be studying in these areas by concentrating on getting the basics right. Enormous emphasis is placed on relating the complex geometry of turbomachines to the fundamental analysis models used throughout the design of all turbomachinery. The simple techniques described in the book provide the basis for preliminary design of all turbomachinery and so mastering the concepts in this book provides a solid foundation for later study.


This book is based on an introductory turbomachinery course at Durham University. This course was taught by Dr David Gregory-Smith and Professor Li He over a number of years and I am extremely grateful to them for providing a clear and lucid set of principles on which to base this work.

My current colleagues at Durham Dr Rob Dominy and Dr David Sims-Williams have also provided invaluable help (even if they didn’t realise it!) in preparing this work.

The book is designed to help students over some important “Threshold Concepts” in educational jargon. A threshold concept is an idea that is hard to grasp but once the idea is understood transforms the student understanding and is very hard to go back across. Within turbomachinery my view is that understanding the cascade view, velocity triangles and reaction form three threshold concepts, perhaps minor ones compared to the much bigger ideas such as "reactive power" or "opportunity cost" that are also proposed but this view has significantly influenced the production of this book.

I’d therefore like to acknowledge Professor Eric Meyer for introducing me to the idea of threshold concepts.


1 Introduction
1.1 How this book will help you
1.2 Things you should already know
1.3 What is a Turbomachine?
1.4 A Simple Turbine
1.5 The Cascade View
1.6 The Meridional View
1.7 Assumptions used in the book
1.8 Problems

2 Relative and Absolute Motion
2.1 1D Motion
2.2 2D Motion
2.3 Velocity Triangles in Turbomachinery
2.4 Velocity Components
2.5 Problems

3 Simple Analysis of Wind Turbines
3.1 Aerofoil Operation and Testing
3.2 Wind Turbine Design
3.3 Turbine Power Control
3.4 Further Reading
3.5 Problems

4 Different Turbomachines and Their Operation
4.1 Axial Flow Machines
4.2 Radial and Centrifugal Flow Machines
4.3 Radial Impellers
4.4 Centrifugal Impellers
4.5 Hydraulic Turbines
4.6 Common Design Choices
4.7 The Turbomachine and System
4.8 Problems

5 Application of The Equations of Fluid Motion
5.1 Conservation of Mass
5.1.1 Application to Radial Machines
5.2 Conservation of Momentum
5.2.1 The Difference Between a Single Aerofoil and a Cascade of Blades
5.3 Conservation of Energy and Rothalpy
5.3.1 Rothalpy
5.3.2 Rothalpy in Stators and Rotors
5.4 Problems

6 Efficiency and Reaction
6.1 Efficiency
6.1.1 Using Efficiency
6.1.2 Other Efficiency Definitions
6.2 Reaction
6.3 Reaction on the h − s Diagram
6.4 Problems

7 Dimensionless Parameters for Turbomachinery
7.1 Coefficients for Axial Machines
7.2 Coefficients for Wind Turbines
7.3 Coefficients for Hydraulic Machines
7.3.1 Specific Speed for Turbines
7.3.2 Specific Speed for Pumps
7.3.3 Using Specific Speeds
7.4 Problems

8 Axial Flow Machines
8.1 Reaction for Repeating Stage
8.1.1 Zero Reaction (Impulse) Stage
8.1.2 50% Reaction Stage
8.2 Loading and Efficiency Variation with Reaction
8.3 Stage Efficiency
8.4 Choice of Reaction for Turbines
8.5 Compressor Design
8.6 Multistage Steam Turbine Example
8.7 Problems

9 Hydraulic Turbines
9.1 Pelton Wheel
9.2 Analysis Approach
9.3 Francis Turbine
9.4 Kaplan Turbine
9.4.1 Loss Estimation
9.4.2 Draft Tube Analysis
9.4.3 Effect of Draft Tube
9.5 Problems

10 Analysis of Pumps
10.0.1 Pump Geometry and Performance
10.1 Pump Diffuser Analysis
10.2 Pump Losses
10.3 Centrifugal Pump Example
10.4 Net Positive Suction Head (NPSH)
10.4.1 Cavitation Example
10.5 Application to Real Pumps
10.6 Problems

11 Summary

Appendix A: Glossary of Turbomachinery Terms

Appendix B: Picture Credits

About the Author

Author's websites

Grant Ingram graduated from Durham University in 1997 on the first cohort of the then brand new MEng degree. After two years in the electricity supply industry working on power stations large and small he returned to Durham to complete a PhD sponsored by Rolls-Royce. Technology developed in conjuction with his work is now flying around in aeroplanes around the world.

Following the successful conclusion of his PhD, Grant spent a year working at the Engineering Design Centre at Newcastle University before joining the School of Engineering as a lecturer in September 2005.

Since then he has worked on two key areas of research: 1. Making Turbomachinery more efficient and 2. Making renewable devices work better. Both of these activities are approached from a fluid dynamics background.

He won the PE Publishing Prize for the best paper published in the Journal of Power and Energy in 2008 and in 2009 published his first book which is available as a free download.

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