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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.001
0.005
0.01
0.05

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio is used in gas turbines

To reduce the exit temperature
To increase the output
To increase the efficiency
To save fuel

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Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and isentropic heat drop
Net work output and work done by turbine
Net work output and heat supplied
Actual heat drop and isentropic heat drop

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Compressors, Gas Turbines and Jet Engines
For perfect intercooling in a two stage compressor

p₁/p₃ = p₂/p₁
p₁ = p₂ p3
p₂/p₁ = p₃/p₂
p₁ = p3

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Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Collect more air
Convert kinetic energy of air into pressure energy
Beautify the shape
Provide robust structure

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Compressors, Gas Turbines and Jet Engines
Air-fuel ratio in a jet engine will be of the order of

0.62569444444444
2.5006944444444
0.41736111111111
0.83402777777778

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