关键词: 超声速燃烧室;煤油;支杆位置;燃烧;影响

Abstract: Injection by struts is propitious to the mixing of kerosene which has been pulverized by injectors with air stream so that the kerosene can be ignited and burned quickly. In order to study the effects of injectors locations in combustor on the mixing and combustion performance, the computation and experiments have been carried out under the condition of combustor entrance Mach number 2 and 3,respectively, where the struts are located in the foreside (the first location) and middle (the second location) of combustor. Based on the investigation results some conclusions can be drawn as follows:the nearer the struts are located to the hydrogen combustion area,the more kerosene can get into that area quickly and the shorter ignition delay time is obtained. When struts are located at the second location, the near wall low-velocity areas before and after the struts are collected with the recirallation area before the hydrogen combustion zone, which can increase kerosene residence time and enhance the fuel mixing and the upstream spread of the flame. For the kerosene steady combustion case, when struts are located at the second location, the height of the combustion zone is greater than the half height of the combustor, which results in narrower area in the main flow stream,lower velocity and higher temperature and more intense combustion of kerosene.

Key words: Supersonic combustor; Kerosene; Strut location; Combustion; Influence