6ME3: STEAM TURBINES AND GAS DYNAMICS
Section-A: Steam
Turbine
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Vapour Power: cycles including superheating, reheating,
regenerative and watr=erextraction cycles. Concepts of binary and trinary
vapour cycles. State point locus, reheat factor and energy losses in stream
turbines
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Basic equations: For efficiency and utilization factor
for radial flow, axial flow, impulse and reaction turbines. Methods of
reducing rotor speed, velocity diagrams for two stages. Calculation of main
blade dimensions, thrust, theoritical power; torque and optimum operating
variables.
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Classification: Base load, pass out, exhaust and back
pressure turbines; special constructional features of steam turbines,
lubrication systems; Governing: Throttle control; nozzle control and by pass
governing; mechanical oil relay and emergency trip governors. Starting and
stopping procedure.
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Condensers: Steam condensing plants; advantages of
condensers; source of air in condensers, and performance of condenser.
Section-B: Gas Dynamics
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Isentropic Flow: Velocity of sound; Match angle; Match
number, steady isentropic flow through ducts; use of isentropic tables;
condition for maximum discharge; choked flow; flow through convergent and
convergent-divergent nozzle, supersaturated flow in nozzle.
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Adiabatic flow and flow with Heat Transfer: Adiabatic
flow; Fannoline tables; entropy change; choking due to friction; flow through
long ducts; Adiabatic flow: Rayleigh line; use of tables; change in entropy,
effect of change in stagnation temperature.
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Normal Shock: Plane stationary normal shock:
Ranking-Hugoniot relations: increase in entropy: prandtl;s relations ; change
in stagnation pressure across the shock
Note: The
weightage for settingquestion paper from section A and B should be in the ratio
of 5:3 Student has to answer at least two questions from Section A and one from
Section B.
List of Recommended Books:
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Steam and Gas Turbines, R.
Yadav, Central Publishing House, Allahabad
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Thermodynamics and heat Power Engineering. Vol. I, M.L.Mathur and
F.S.Mehta, Jain Bros., New Delhi
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Gas Dynamics, S.M.Yahya
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