An insulated axial flow air compressor for a gas turbine engine is being tested in a laboratory. The inlet conditions are 0.090 MPa and -3.00°C, and the outlet is at 0.286 MPa and 217°C.
Use the gas tables to determine the ratio of the power input for an isentropic process to the actual adiabatic power input. This ratio is defined to be the compressor's isentropic efficiency.