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空气节流可以有效地实现超燃冲压发动机燃烧室燃料的稳定燃烧,采用非定常数值模拟和地面试验研究了空气节流作用下乙烯燃料超燃冲压发动机的流场特性。结果表明:在燃烧室入口马赫数2、静温530K,静压0.1MPa,845mm处节流条件下,冷流流场达到稳定所需时间较短,约为2ms;在空气节流开始后的6ms注入燃料实现发动机的起动点火是合适的;28ms后燃烧流场稳定,流场呈现短周期的小幅振荡,周期约为0.86ms,振荡对流场的影响很小;壁面压力数据的数值模拟结果与试验结果匹配良好,数值模拟更加全面地给出了流场结构信息。
Air throttling can effectively achieve the stable combustion of fuel in the scramjet engine combustion chamber. The unsteady numerical simulation and ground tests are used to study the flow field characteristics of the ethylene fuel scramjet under air throttling. The results show that the time required for the cold flow field to stabilize under the throttling conditions of the Mach number of the combustion chamber 2, the static temperature of 530 K, the static pressure of 0.1 MPa and the pressure of 845 mm is short, which is about 2 ms. After the start of air throttling 6ms injection of fuel to achieve the engine starting ignition is appropriate; 28ms after the combustion flow field is stable, the flow field shows a small period of small oscillations, the cycle is about 0.86ms, the impact of oscillation on the flow field is small; wall pressure data numerical simulation results Matched well with the experimental results, the numerical simulation provides more comprehensive information about the flow field structure.