Problem 9.074 si air enters the diffuser of a turbojet engine at 18 kpa, 216 k, with a volumetric flow rate of 230 m3/s and a velocity of 265 m/s. the compressor pressure ratio is 13, and its isentropic efficiency is 87%. air enters the turbine at 1560 k and the same pressure as at the exit of the compressor. the turbine isentropic efficiency is 89%, and the nozzle isentropic efficiency is 97%. the pressure at the nozzle exit is 18 kpa. use an air-standard analysis. collapse question part step 1 determine the rate of heat input to the combustor, in mw.