BEHAVIOR OF DETONATIONS PASSING THROUGH REFLECTION NOZZLES

Interaction between detonation and Prandtl-Meyer expansion is an inter esting problem to be solved in connection with the disappearance or co ntinuance of the fish-scale pattern. In this study, seven kinds of ref lection nozzles were utilized in order to produce the Prandtl-Meyer ex pansion effects at various levels. Stability and behavior of a detonat ion propagating in a reflection nozzle attached to a parallel channel part were experimentally observed with the initial pressure as a param eter using optical measurement methods such as open-shutter and schlie ren photographic techniques. It was found that in the case of a nozzle at the half-vertical angle of A = 18 degrees without the throat lengt h, an initial pressure of at least 5.3 kPa is necessary to sustain det onation configuration during passage through this nozzle.