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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 100 m increase in elevation

5%
0.5%
0.1%
1.0%

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Compressors, Gas Turbines and Jet Engines
Maximum delivery pressure is a rotary air compressor is of the order of

6 kg/cm²
16 kg/cm²
25 kg/cm²
10 kg/cm²

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Compressors, Gas Turbines and Jet Engines
The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

Slip factor
None of these
Velocity factor
Velocity coefficient

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Compressors, Gas Turbines and Jet Engines
In multistage compressor, the isothermal compression is achieved by

By insulating the cylinder
Employing inter-cooler
By running compressor at very slow speed
By constantly cooling the cylinder

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

p₂/p₁ = p₃/p₂ = p₄/p₃
p₁ p₃ = p₂ p₄
p₃/p₁ = p₄/p₂
p₁ p₂ = p₃ p₄

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Compressors, Gas Turbines and Jet Engines
The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

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

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