Compressors, Gas Dynamics and Gas Turbines - Section 1

The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

In a reciprocating air compressor, the compression work per kg of air

An axial compressor gives optimum performance at high speeds and large volume flows.

The type of rotary compressor used in aeroplanes, is of

The increase in pressure in a roots blower is entirely due to back flow of air.

The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

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 intercooler 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)

The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as