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针对RBCC同一扩张流道多模态匹配工作的特点,通过三维数值模拟,研究了亚燃模态热力喉道形成机理及规律,结果表明通过合理控制流道中的加热量和流道面积变化可以有效地控制热力喉道形成位置,其中位于第二级燃烧室中的凹腔组对形成稳定的热力喉道有比较关键的作用,其剪切层形成的燃烧区域成为一个稳定的放热源,给流道中的气流提供了使马赫数出现转折的能量,凹腔后壁斜面的几何收缩也为壅塞面的形成提供助力,凹腔后流道的气流逐步稳定成为超声速流,热力喉道基本形成于第二级凹腔组后。
According to the characteristics of multi-modal matching work of RBCC same expansion runner, the formation mechanism and rule of thermal throat in sub-combustion mode are studied by three-dimensional numerical simulation. The results show that it is effective to control the heating amount and flow area change in the flow path reasonably Control the location of the thermodynamic throat where the set of cavities located in the second stage combustion chamber is critical to the formation of a stable thermal throat and the combustion zone formed by the shear layer becomes a stable source of heat release The airflow in the track provides the energy to turn the Mach number. The geometrical shrinkage of the back wall of the cavity also provides assistance for the formation of the constriction surface. The airflow in the backflow channel of the cavity gradually stabilizes into the supersonic flow. The thermal throat is basically formed in the After the second cavity group.