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A ramjet engine is an air - breathing propulsion device with essentially no rotating machinery ( no rotating compressor blades, turbine, etc. ) . The
A ramjet engine is an airbreathing propulsion device with essentially no rotating machinery
no rotating compressor blades, turbine, etc. The basic generic parts of a conventional ramjet
are sketched below. The flow, moving from left to right, enters the inlet where it is compressed
and slowed down. The compressed air then enters the combustor at subsonic speed, where it is
mixed and burned with a fuel. The hot gas then expands through a nozzle. The net result is
the production of thrust toward the left. The ramjet shown is in a supersonic freestream with
a detached shock wave ahead of the inlet. For this problem, you may assume that the gas that
flows through the engine has a ratio of spocific heats and
a The portion of the shock between point and point is a normal shock. After passing
through the shock wave, the flow from point to point located at the entrance to the
combustor, is isentropic The ramjet is flying at Mach at a standard altitude of where
the air pressure and temperature are and respectively. Calculate the air
temperature and pressure at point when the Mach number at that point is
b Calculate the entropy change across the shock wave.
c Suppose heat is added from point to point in a constant pressure process, such that
and The flow from point to is then accelerated in an
isentropic process isentropic where the flow becomes choked at point ie If the
area of the nozzle throat at point is calculate and the mass flow rate of
air through the engine.
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