【摘要】 通过隐式耦合求解可压缩N-S方程及组分方程,对台阶喷射燃烧室和支杆喷射燃烧室内的流场进行了三维数值研究.研究结果表明,支杆喷射燃烧室喷入氢气,在整个流道内产生的流向涡和横向涡更加强烈,更加能够促进氢气和空气在流向的对流掺混和扩散掺混效果,从而使得燃烧室内的掺混距离缩短;同时,这两个超声速燃烧室内的凹槽结构能起到增强掺混和稳定火焰的作用,使燃烧室后部燃烧区域增大.更多还原

【Abstract】 The flow fields of hydrogen injected into combustors with step injectors and strut injectors were numerically investigated by solving the 3-D compressible Navier-Stokes and species equations with implicit finite volume method.The results show that because of the stronger streamwise and spanwise vortexes induced by the hydrogen flows injected via the strut injectors,hydrogen/air mixing efficiency is greatly enhanced and the mixing length along the channel is shortened.Besides,the cavities in both types of combustors enable the fuel to be mixed more fully and also stabilize the flame,enlarging the combustion area in the rear parts of the combustors.更多还原