18AE46 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:

At the end of the course the student will be able to:

1. CO1: Compute the energy transfer and energy transformation in turbomachines.

2. CO2: Analyze the design of turbomachine blades.

3. CO3 : Apply hydraulic pumps and turbines for specific requirements

Question paper pattern:

• The question paper will have ten full questions carrying equal marks. Each full question consisting of 20 marks.
• There will be two full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module.

Textbook/s

1 Turbines, Compressors & Fans S.M. Yahya Tata-McGraw Hill Co 2nd Edition (2002)

2 Principles of Turbo Machinery D.G. Shephered The Macmillan Company 1964

Reference Books

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

2 Turbomachines Govinde Gowda and Nagaraj MM Publishers 9th Edition,2016

3 Fundamentals of Turbomachinery B.K.Venkanna Prentice Hall India 2009