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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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