Air enters the diffuser of a ramjet engine at 22 kPa, 228 K and avelocity of 920 m/s, decelerating to a negligible velocity at thepoint at which heat is added. Using cold airstandard analysis withconstant speciï¬c heats at 300K, determine the following if the exitpressure is 22 kPa and heat is added at 750 kJ per kg of air:
(a) The pressure at the diffuser exit, in kPa.
(b) The velocity at the nozzle exit, in m/s.
(c) If the fuel used requires a temperature of 900K toauto-ignite, is the craft moving fast enough to use this fuel? Ifnot, what minimum speed must it be moving such that the airtemperature after compression will ignite the fuel?
