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A subsonic flight has actual inlet pressure recovery of 0.975. Estimate the thrust loss by this subsonic engine.(a) 3.37%(b) 56%(c) 2.5%(d) 11.22%This question was addressed to me in final exam.This intriguing question comes from Propulsion topic in chapter Propulsion of Aircraft Design

Answer» RIGHT choice is (a) 3.37%

The best explanation: Given, subsonic AIRCRAFT, actual inlet PRESSURE recovery = 0.975.

Thrust loss can be approximated as follows,

% Thrust loss = C*(reference pressure recovery – actual inlet pressure recovery)*100

Since, C is not given we will consider it as 1.35. 1.35 is a TYPICAL VALUE of C for subsonic aircraft.

Hence,

% Thrust loss = 1.35*(1-.975)*100 = 3.37%.


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