突跃型与平滑型斜爆震波起爆机制数值模拟

采用带有化学反应的Euler方程,对突跃型与平滑型2种形态的斜爆震波(ODW)在起爆机制和结构特点等方面的差异进行了研究.结果表明:斜激波(OSW)后是否存在亚声速区是判定斜爆震形态的依据.当波后火焰抬升斜激波面使得亚声速区存在时,横向激波与三波点结构就会出现并形成突跃型斜爆震.当波后所有区域皆为超声速区时,波后火焰燃烧无法影响到上游激波面,则会形成平滑型斜爆震.通过斜激波关系式给出了横向激波形成所需的临界斜激波角度,只有当斜激波角度大于此临界角度时才能形成突跃型斜爆震波,反之则形成平滑型斜爆震波. 

Initiation mechanism investigation of saltation and smoothness oblique detonation waves

Euler equations with chemical reaction were used to study the difference in the initiation mechanism and characteristics of saltation and smoothness oblique detonation waves (ODW).The result shows that the criterion which determines the oblique detonation wave configuration is whether a subsonic zone exists behind the oblique shock wave(OSW).If the OSW raised by the flame behind it can lead to the formation of a subsonic zone, the transverse shock wave and triple point would appear and saltation ODW would form.The smoothness ODW would form if all zones are supersonic behind the OSW so the flame can not touch the upriver OSW.The OSW critical angle which leads to the formation of transverse shock wave is calculated from the equations of OSW.When the OSW angle is bigger than this critical angle, saltation ODW would form.otherwise, smoothness ODW would form.