三维激波/边界层相互作用的间歇分离和涡结构关系

2018/12/12   下载量： 2 次

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采用10赫兹200毫焦单脉冲能量的Nd:YAG激光器做光源，用两台SensiCam PCO相机做成像部件，加上LaVision公司的DaVis7.2和8.0软件平台，构成了一套立体3维粒子成像测速系统(PIV)。用此系统，对马赫数2.75的超音速激波风洞中的三维激波/边界层相互作用的间歇分离和涡结构关系进行了研究。得到了许多重要结果。

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The relationship between the three-dimensional vortex structures and flow-separation zones generated by a shock wave/boundary-layer interaction within a low-aspect-ratio duct was studied using stereoscopic particle imaging velocimetry measurements. In this configuration, the interaction of the incident shock with all walls was important in controlling the flowfield; the three interactions coupled to produce a strongly distorted flowfield. Conditional sampling was used to construct the local probability of reverse flow maps, and thus quantify the distribution of regions of intermittent separation on both bottom-walls and side-walls. The latter regions were found to be significantly larger and more likely to separate than the former. Thus, it was concluded that the sidewall and corner flow interactions dominate in this configuration. A triple decomposition of motion was used to construct a three-dimensional representation of the vortex features generated by the interaction. The results indicated that the flow field was
dominated by three vortex systems: 1) the vortex associated with the sidewall swept-shock interaction; 2) a complex, possibly branched, vortex pair induced on the bottom wall; and 3) a vortex pair induced by the flow at the corner,which coupled the two interactions. The role of the three vortex systems on the onset of flow separation was also explored and discussed.

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