In order to study the non-self-similarity of Mach reflection of detonation waves

Mach reflection of detonation waves was investigated in a thin rectangular channel

and the schlieren system and smoked foils were used respectively to obtain experimental results about Mach reflection that happened in three kinds of pre-mixtures. The results illustrate that for stable or unstable mixtures

the triple point trajectory rendered by Mach reflection is a curve

which means that the Mach reflection of detonations waves along the wedge doesn't have the characteristic of self-similarity as that of the non-reactive shocks.A crucial feature about the non-self-similarity is found that the trajectory of Mach reflection in detonation waves roughly follows triple point trajectory of non-reactive shock theory at beginning of wedge

and then falls on a line parallel to triple point trajectory of reactive shock theory.When the initial pressure was 10kPa and the wedge angle was 30°

the height of Mach triple point of the pre-mixtures for the transition was 0.8

1.05cm and 0.5cm respectively

which demonstrates that the transition of unstable mixture happens early than stable mixture.