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首页> 外文期刊>The Aeronautical Journal >Study of unsteady characteristics of flare-induced hypersonic shock-wave boundary-layer interaction flowfield with variation in γ
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Study of unsteady characteristics of flare-induced hypersonic shock-wave boundary-layer interaction flowfield with variation in γ

机译：耀斑引起的高超声速冲击波边界层相互作用流场的非定常特性研究

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Experimental work has been carried out to study the unsteady flow-field characteristics related to shock-wave/boundary-layer interaction. Tests were carried out on an axisymmetric configuration that has a semi-cone angle of 35° and a flare angle of 20°. Further influence of low γ gases (CO_2 and CF_4) on the overall interaction process is also investigated. Both surface and off-surface analysis has been carried out. Off-surface study has been made with a laser schlieren system. The purpose of this study was to investigate the source of the unsteadiness related to such interactions. Two types of shock motions, namely, flapping and rippling could be identified for air, the relative importance of each of which is strongly dependent on the location within the interaction and on the type of test gas. Spectral analysis shows the large-scale motion of the separation bubble to be the main source of high amplitude fluctuations. However, the existence of separation bubble itself does not necessarily indicate the prevalence of unsteady flow conditions.
机译：已经进行了实验工作以研究与冲击波/边界层相互作用有关的非稳态流场特性。在具有35°的半圆锥角和20°的张角的轴对称结构上进行了测试。还研究了低γ气体（CO_2和CF_4）对整个相互作用过程的进一步影响。已经进行了表面和表面外分析。已经使用激光schlieren系统进行了表面研究。本研究的目的是调查与此类相互作用相关的不稳定因素。可以识别出两种类型的冲击运动，即空气的拍打和起伏，每种冲击的相对重要性在很大程度上取决于相互作用中的位置以及测试气体的类型。频谱分析表明，分离气泡的大范围运动是高振幅波动的主要来源。但是，分离气泡本身的存在并不一定表明不稳定流动条件的普遍性。

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