A ramjet operates by taking in air at the inlet, providing fuel for combustion, and exhausting the hot air through the exit. Th e mass fl ow at the inlet and outlet of the ramjet is 60 kg/s (the mass fl ow rate of fuel is negligible). Th e inlet velocity is 225 m/s. Th e density of the gases at the exit is 0.25 kg/m3 , and the exit area is 0.5 m2 . Calculate the thr

15300 N

Explanation:

= Density of air at inlet

= Mass flow rate = 60 kg/s

= Inlet velocity = 225 m/s

= Density of gas at outlet =

= Inlet area

= Outlet area =

Since mass flow rate is the same in the inlet and outlet we have

Thrust is given by

The thrust generated is 15300 N.

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answer:

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