(Solved): 3. Ideal Ramjet A ramjet is being used as the propulsion source for a supersonic vehicle. The vehi ...

3. Ideal Ramjet A ramjet is being used as the propulsion source for a supersonic vehicle. The vehicle is operating at an altitude where the ambient temperature is 242 K and the ambient pressure is 30.5 kPa with a flight (air) speed of 925 m/s. The ramjet burns a JP fuel with a heating value of 43.7 MJ/kg. Assume the flow through the ramjet and around the missile is ideal (inviscid, variable area inlets and nozzles, no shocks, etc.) and that the gas flowing through the ramjet has a constant molecular weight of 28.5 and a constant specific heat (cp) of 1150 J/kgK. If the ramjet's nozzle is perfectly expanded, what is the pressure ratio (po,in/pe) across the nozzle, where po,in is the stagnation pressure of the gas entering the nozzle and pe is the (static) pressure of the gas exiting? Additionally, if the ramjet is operating at its maximum thrust, what are the temperature and velocity of the gas exiting the nozzle and the ramjet's propulsive efficiency?