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

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

ANSWER DOWNLOAD EXAMIANS APP

Compressors, Gas Turbines and Jet Engines
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₂/n₁
W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₁/n₂
W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

ANSWER DOWNLOAD EXAMIANS APP

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)/2
p₂ = p₁. p₃
p₂ = Pa p₃/p₁

ANSWER DOWNLOAD EXAMIANS APP