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At which diameter we should design a supersonic after burning engine for a fighter which will have thrust at takeoff 150000 Unit and bypass ratio of 0.7.(a) 114.67 unit(b) 160.78 unit(c) 350.39 unit(d) 235.78 unitThe question was asked by my school teacher while I was bunking the class.Query is from Propulsion topic in chapter Propulsion and Fuel System Integration of Aircraft Design

Answer»

Right CHOICE is (a) 114.67 unit

The explanation is: Given, THRUST T = 150000 unit, BPR = 0.7.

Now, DIAMETER D is given by, D = 0.288*T^0.5*E ^0.04*BPR = 0.288*150000^0.5*e^0.04*0.7

Hence, D = 0.288*387.3*1.028 = 114.67 unit.



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