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Inlet pressure recovery is defined as ______

(a) total pressure deliver to the engine divided by freestream total pressure

(b) total dynamic pressure

(c) incoming velocity by incoming Mach number

(d) lift to drag ratio

The question was posed to me in semester exam.

This interesting question is from Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design

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Right choice is (a) total pressure deliver to the engine divided by freestream total pressure

The best explanation: Inlet pressure recovery is nothing but the total pressure which is deliver to the engine divided by the free stream total pressure. Dynamic pressure is exerted due to velocity of the fluid. Lift drag ratio is more important for the aerodynamics of the aircraft.

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