Compressors, Gas Turbines and Jet Engines
Only rocket engines can be propelled to space because

They are not air breathing engines
They have high propulsion efficiency
These engines can work on several fuels
They can generate very high thrust

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

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

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Compressors, Gas Turbines and Jet Engines
If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

D₁/D₂ = p₂/p₁
D₁/D₂ = p₁ p₂
D₁/D₂ = p₁/p₂
None of these

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