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If bypass ratio of subsonic non afterburning engine is found to be 2.1 then, what will be the specific fuel consumption of the same engine at cruise?(a) 0.8(b) 0.1(c) 0.3(d) 0.4I have been asked this question in semester exam.The query is from Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design

Answer»

The CORRECT choice is (a) 0.8

Easiest EXPLANATION: GIVEN, BPR = 2.1.

Now, SFC at CRUISE is given by,

SFC = 0.88*e ^(-0.05*BPR) = 0.88 * e ^(-0.05*2.1) = 0.7922 = 0.8.



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