Question

For which range of values is the hypersonic similarity rule valid for very slender bodies?

(a) K = 0.5 to infinity

(b) K > 1.5

(c) 0.5 < K < 1.5

(d) 2 < K < 1000

I got this question in semester exam.

Question is taken from Hypersonic Similarity in portion Transonic and Hypersonic Flows of Aerodynamics

Answer 1

The correct answer is (a) K = 0.5 to infinity

The best I can explain: Hypersonic similarity condition does not hold true for all values of K. For bodies which are very slender such as the cone having half angle of 3 degrees, the similarity stays valid only when the value of K ranges from 0.5 to infinity.