5ME5: GAS TURBINES AND JET PROPULSION
Section A: Gas
Turbine
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Gas Turbine Cycles: Ideal Cycles; open and closed cycles;
constant pressure and constant volume cycles; intercooling, reheat and reheat
with heat exchange; Ericksson cycle. Compounding - different shaft
arrangements, special Applications of gas turbines such as industrial
aircraft, marine. Gas turbines in power generation; combined cycle power
generation
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Performance of Practical Gas Turbine Cycles: Compressor
and turbine efficiencies; pressure losses; heat exchanger thermal ratio;
mechanical losses; variation of specific heat; design point performance
calculation for simple cycle. Factors affecting the performance, calculation
of practical gas turbine cycles; polytropic efficiency; general performance of
simple cycle with losses
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Gas Turbine cycles for aircraft propulsion: Criteria of
Performance intake and [propelling nozzle efficiencies, simple turbojet cycle,
turbofan engine, turboprop engine, thrust augmentation
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Centrifugal Compressors: Principal of operation; work
done and pressure rise; slip diffuser. Design criterion; compressibility
effects; non-dimensional quatities used for plotting compressor
characteristics surging, choking and rotating stall gas Turbine
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Axial Fow Compressors:Basic constructional features;
turbine v/s compressor blades; elementary theory; degree of reaction; vortex
theory, simple design calculations; introduction to blade design; cascade
test; compressibility effects; operating characteristics; stalling and surging
polytropic efficiency, matching of compressure and turbine
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Axial Fow Turbines: Choice of blade profile. pitch and
chord. stage and overall turbine performance; cooling of turbine blades;
overall turbine performance: methods of improving part-loadperformance:
matching procedures for twin-spool and turbofan engines: transient behaviour
of gas turbine, principles of control systems.
List of
Recommended Books:
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Gas Turbines Theory, H.
Cohan, G.F.C. Roger and HIH Saravanama, Longman
Scientific & Technical Pub., N.York
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Gas Turbines and Jet and Rocket Propulsion, M.L.Mathur and
R.P.Sharma,
Standard Publisher & Distributor, New Delhi
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