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为了研究抛物线喷管型面的3个参数——初始膨胀圆弧半径、入口角和出口角的变化对喷管流动分离过程的影响规律,模拟了不同参数组合下的抛物线喷管流场参数,获得了喷管流动位置、分离模态随集气室压强增加的变化过程.结果表明:这3个参数能够影响发动机起动过程中喷管流场的发展过程.在一定范围内分离模态转换喷管压比(NPR)与初始膨胀圆弧半径呈正相关;通过合理设定入口角和出口角,可以推迟和缩短受限激波分离过程,为解决彭冠侧向载荷问题提供了可能的方向.
In order to study the influence of three parameters of parabola nozzle profile, such as initial expansion arc radius, entrance angle and exit angle, on the flow separation of nozzle, the parabolic nozzle flow field parameters under different parameters were simulated, The results show that these three parameters can affect the development of the nozzle flow field during the starting process of the engine.In a certain range, the mode conversion spray The relationship between tube pressure ratio (NPR) and initial expansion arc radius is positively correlated. By reasonably setting inlet angle and outlet angle, the confined shock separation process can be postponed and shortened, which provides the possible direction for solving the Peng crown lateral load problem.