In which one of the following flows must compressibility be considered?
A) Flow around a commercial jet at takeoff
B) A category 5 hurricane
C) A Corvette at full-throttle on the Salt Lake Flats
D) Flow around the wing of a commercial aircraft in its approach to an airport

Question

Quizplus · Accepted Answer

Flow around the wing of a commercial aircraft in its approach to an airport
Speeds must be in excess of 100 m/s (360 kph or 240 mph) before compressibility
must be considered in flow around an object. Commercial aircraft take off at speeds
less than 40 m/s, considerably below M = 0.3. Only D
 qualifies.

In Which One of the Following Flows Must Compressibility Be