17AE46 TURBOMACHINES syllabus for AE

Introduction to turbomachines:

Classification and parts of a turbo machines; comparison with positive displacement machines; dimensionless parameters and their physical significance; specific speed; illustrative examples on dimensional analysis and model studies.

Energy transfer in turbomachines:

Basic Euler turbine equation and its alternate form; components of energy transfer; general expression for degree of reaction; construction of velocity triangles for different values of degree of reaction.

Compression process:

Overall isentropic efficiency of compression; stage efficiency; comparison and relation between overall efficiency and stage efficiency; polytropic efficiency; pre heat factor.

Expansion process:

Overall isentropic efficiency for a turbine; stage efficiency for a turbine; comparison and relation between stage efficiency and overall efficiency, polytropic efficiency; reheat factor for expansion process.

Design and performance analysis of Centrifugal compressors:

Types, design parameters, flow analysis in impeller blades, volutes and diffusers, losses, slip factor, characteristic curves, surging, choking. Construction details.

Design and performance analysis of axial fans and compressors:

Stage velocity diagrams, enthalpy-entropy diagrams, stage losses and efficiency, work done, simple stage design problems, performance characteristics, instability in axial compressors. Construction details.

Design and performance analysis of axial flow turbines:

Turbine stage, work done, degree of reaction, losses and efficiency, flow passage; subsonic, transonic and supersonic turbines, multi-staging of turbine; exit flow conditions; turbine cooling

Design and performance analysis of radial turbines:

Thermodynamics and aerodynamics of radial turbines; radial turbine characteristics; losses and efficiency; design of radial turbine.

Hydraulic pumps:

Centrifugal and axial pumps. Manometric head, suction head, delivery head; manometric efficiency, hydraulic efficiency, volumetric efficiency, overall efficiency; multi stage pumps. Characteristics of pumps.

Hydraulic turbines:

Classification; Module quantities; Pelton wheel, Francis turbine, Kaplan turbine and their velocity triangles. Draft tubes and their function. Characteristics of hydraulic turbines.

Course outcomes:

After studying this course, students will be able to:

1. Compute the energy transfer and energy transformation in turbomachines.

2. Analyse the design of turbomachine blades.

3. Apply hydraulic pumps and turbines for specific requirements

Graduate Attributes (as per NBA):

• Engineering Knowledge.
• Problem Analysis.
• Design / development of solutions (partly).
• Interpretation of data.

Question paper pattern:

• The question paper will have ten questions.
• Each full question consists of 16 marks.
• There will be 2 full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub questions covering all the topics under a module.
• The students will have to answer 5 full questions, selecting one full question from each module.

Text Books:

1. S.M. Yahya, “Turbines, Compressors & Fans”, Tata-McGraw Hill Co., 2nd Edition (2002), ISBN 13: 9780070707023.

2. D.G. Shephered, “Principles of Turbo Machinery”, The Macmillan Company (1964), ISBN-13: 978-0024096609.

Reference Books:

1. V. Kadambi and Manohar Prasad, “An introduction to Energy conversion, Volume III, Turbo machinery “, Wiley Eastern Ltd, 1977, ISBN: 9780852264539