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采用计算流体力学和风洞试验两种手段,对冲压发动机出口封闭的多种超声速进气道内通道气流振荡现象进行了研究。结果表明,在一定的超声速范围内,封闭的进气道内通道发生了较强气流振荡现象,振荡频率、幅值和内通道长度、飞行马赫数有关,该振荡现象是一种自激振荡现象。利用亥姆霍兹共振器频率公式可以对封闭的进气道内通道振荡频率进行预估,并对其归纳出一种修正方法,可以结合模型试验结果对进气道和燃烧室内流振荡频率和幅值进行分析,为飞行试验提供预估和参考。
Two kinds of methods of computational fluid dynamics and wind tunnel test were used to study the phenomenon of airflow oscillation in a variety of supersonic inlet passages with closed export of ramjet engine. The results show that in a certain supersonic speed range, strong airflow oscillation occurs in the closed inlet passage. The oscillation frequency and amplitude are related to the length of the inner passage and the Mach number of the flight. The oscillation phenomenon is a self-oscillating phenomenon. Based on the Helmholtz resonance frequency formula, the closed-end in-channel channel oscillation frequency can be estimated and a correction method can be summarized. The model test results can be used to analyze the frequency and amplitude of the internal oscillation of the inlet channel and the combustion chamber The value of the analysis for the flight test to provide estimates and references.