Compressors, Gas Turbines and Jet Engines
Ram compression in turbojet involves

Compression of inlet air
Lost work
Reduction of speed of incoming air and conversion of part of it into pressure energy
Increasing speed of incoming air

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Actual compressor work and theoretical compressor work
Output and input
Compressor work and turbine work

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

Carbonisation of coal
Passing air and a large amount of steam over waste coal at about 65°C
Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

p₂ = Pa p₃/p₁
p₂ = p₁. p₃
p₂ = (p₁ + p₃)/2
P₂ = Pa × p₃/p₁

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