**CHHATTISGARH SWAMI VIVEKANAND TECHNICAL UNIVERSITY, BHILAI (C G)**

**Semester: VI Branch: Mechanical Engg.**

**Subject: Turbo Machinery**

Total Theory Periods: 50 Total Tutorial Periods: 12

Total Marks in End Semester Exam: 80

Minimum number of class tests to be conducted:

2

UNIT – I

Impulse Turbine

Steam turbine – Principal of operation of steam turbine, types, impulse turbine compounding of steam turbinepressure

compounded velocity compounded and pressure – velocity compounded impulse turbine.

Velocity diagram for impulse turbine, force on the blade and work done. Blade or diagram efficiency, gross stage

efficiency. Influence of ratio of blade to steam speed on blade efficiency in a single stage impulse turbine.

Efficiency of multi-stage turbine.

Impulse blade sections, choice of blade angle. Blade height in velocity compounded impulse turbine.

UNIT – II

Impulse Reaction Turbine

Velocity diagram, degree of reaction, impulse-reaction turbine with similar blade section and half degree of reaction.

(Parson’s turbine) Height of reaction turbine blading section internal losses in steam turbine Nozzle, Losses, blade

friction losses, disc friction losses, blade windage losses or partial admission losses, gland leakage or clearance

losses, leaving velocity or residual loss, carry loss.

UNIT – III

State Point Locus and Reheat Factor

Factor-Stage, efficiency of impulse turbines, stage point locus of an impulse turbine, state point locus for multistage

turbine reheat factor.

Internal efficiency, over all efficiency,relative efficiency, Governing of steam turbine.

Throttle governing, nozzle governing, bypass governing, combination of throttle and nozzle, governing and

combination of bypass and throttle governing.

Effect of governing on the performance of steam turbine.

UNIT – IV

Gas Turbine

Classification of gas turbine. Simple open cycle gas turbine Ideal and actual cycle (Brayton Cycle) for gas turbine

Optimum pressure ratio for maximum specific output in actual gas turbine Regneration, reheat and inter cooling and

effect of these modification on efficiency and output, closed cycle gas turbine.

UNIT – V

Turbo Compressors

Introduction, classifications of Centrifugal compressors – components, working, velocity diagrams, calculations of

power and efficiencies.

Slip factor, surging and choking power and efficiencies.

Axial Flow Compressor-

Construction and working, velocity diagram, calculation of power and efficiencies. Degree of reaction, work done

factor, stalling, comparison of centrifugal and axial flow compressor.

TEXT BOOKS

1. Steam and Gas turbine – By R. Yadav – Central Publishing House, Allahabad

2. Gas Dynamics with Application: S.K. Kulshrestha

REFERENCE BOOKS

1. Turbine compressors and Fans – S.M. Yahya – TMH

2. Gas Turbine – V. Ganeshan – TMH