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If flow has Mach number of 1.2 then, determine the ratio of total and external flow dynamic pressure.(a) 2.4(b) 1(c) 3.8(d) 5.6The question was asked in class test.The doubt is from Flight Mechanics in chapter Performance and Flight Mechanics of Aircraft Design

Answer»

Correct option is (a) 2.4

Best explanation: GIVEN, Mach NUMBER M = 1.2

Ratio of TOTAL pressure and external flow dynamic pressure = (1.428/M^2)*[1+0.2*M^2]^3.5

= (1.428/1.2^2)*[1+0.2*1.2^2]^3.5

= (1.428/1.2^2)*[1+0.288]^3.5

= 2.40.



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