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在超燃冲压发动机试验中,扩压器流动经常出现故障。这样的设备工作状态可能破坏发动机试验台,应加以预防。用一元理论可以分析出扩压器流动失败的原因。扩压器中发动机的损耗与增益,以及摩擦的损耗都代表质量、动量和能量的点源。用化学平衡方程可以计算热堵塞状态。在试验中成功地再现出引起流动堵塞的燃料流量。发动机进气道不启动会损失扩压器系统中引射器的抽吸效率,触发流动堵塞。气体取样耙的阻力也可以促使流动堵塞,扩压器的堵塞与发动机不启动可以互相耦合,造成扩压器失灵滞后,这种现象在试验中也出现过。在Ma=4状态下,试验火箭基组合循环(RBCC)发动机,容易引起扩压器堵塞,这是由于推进剂供给流量较大和比冲相对低的缘故。要研究试验台工作状态来控制试验中的流动堵塞。
In scramjet tests, diffuser flow often fails. Such equipment may damage the working state of the engine test bench, should be prevented. Using unary theory can analyze the reason of the diffuser flow failure. The loss and gain of the engine in the diffuser, as well as the loss of friction, represent the point sources of mass, momentum and energy. The chemical equilibrium equation can be used to calculate the thermal blockage. The fuel flow that caused the flow blockage was successfully reproduced in the experiment. The engine intake does not start, which can reduce the suction efficiency of the ejector in the diffuser system and trigger the flow blockage. Resistance to gas sampling rake can also cause flow blockage, clogging the diffuser and the engine does not start can be coupled to each other, resulting in diffuser failure lag, this phenomenon has also appeared in the experiment. At Ma = 4, the rocket-based combined cycle (RBCC) engine was easily clogged with the diffuser due to the larger flow of propellant and the relative low specific impulse. To study the working conditions of the test bed to control the flow of the test blockage.