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COMPRESSORS, GAS TURBINES AND JET ENGINES

Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 + k - k (p₂/p₁)1/n
1 - k + k (p₁/p₂)1/n
1 + k - k (p₂/p₁) n-1/n
1 - k + k (p₁/p₂) n- 1/n

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Higher pressure ratio per stage
Larger air handling ability per unit frontal area
Aerofoil blades are used
Higher average velocities

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Compressors, Gas Turbines and Jet Engines
The pressure ratio of an ideal vaned compressor with increase in mass flow rate

Remain constant
Increases
First decreases and then increases
Decreases

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Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

First increases and then decreases
Decreases
Increases
First decreases and then increases

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine consists of a

Heating chamber
Cooling chamber
All of these
Compressor

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