Compressors, Gas Turbines and Jet Engines
In the cross compounding of the gas turbine plant

H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
Both the arrangements can be employed
All are connected in series
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine

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

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