An air breathing engine is designed to fly at MD15 utilizing

An air breathing engine is designed to fly at MD=1.5, utilizing a reverse CD nozzle inlet. Calculate (a) the overspeed Mach number required to successfully start the inlet, assuming a fixed geometry, and (b), the area ratio (Ai/At) required to start the throat at MD=1.5, utilizing a variable throat geometry

Solution

From the above given data

Mach number can be calculated as follows = 2

Ratio of area = 34 /56