the air speed of a turbojet engine in flight is 270 m/s. ambient air temperature is -15c. gas temperature at outlet of nozzle is 600c. corresponding enthalpy values for air and gas are respectively 260 and 912 kj/kg. fuel-air ratio is 0.0190. chemical energy of the fuel is 44.5 Mj/kg. owing to incomplete combustion 5% of the chemical energy is not released in the reaction. heat loss from the engine is 21 kj/kg of air. calculate the velocity of the exhaust jet.
solution energy equation for the turbojet engine gives