Question

Let us consider the ambient air temperature is 25°C and aircraft has Mach number of 1.5. Find the stagnation temperature.

(a) 432.32K

(b) 789K

(c) 123.56K

(d) 213.458K

I had been asked this question during an interview.

My doubt is from Structures in portion Structures and Loads of Aircraft Design

Answer 1

Correct choice is (a) 432.32K

The best I can explain: Given, ambient air temperature T1 = 25°C = 25+273.15 = 298.15K, Mach number = 1.5

Stagnation temperature for air is given by,

Stagnation temperature = T1*(1+0.2*M^2)

= (25+273.15)*(1+0.2*1.5^2) = 432.32K.