Quote Originally Posted by Turnup View Post
That process is termed "deflagration". Google it and there is plenty of information out there
You mentioned nothing about subsonic. Had you done that it would have clarified it at the outset.

This:-
Deflagration and detonation are two ways energy may be released. If the combustion process propagates outward at subsonic speeds (slower than the speed of sound), it's a deflagration. If the explosion moves outward at supersonic speeds (faster than the speed of sound), it's a detonation.