Three-dimensional evolution of large-scale vortices in supersonic flow
Three-dimensional evolution of large-scale vortices in supersonic flow
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DOI：
10.1063/1.4938215
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发表时间：
2015-12
影响因子：
4
通讯作者：
Jun-hong Feng;Chi-bing Shen;Qian-cheng Wang
中科院分区：
文献类型：
--
作者：
Jun-hong Feng;Chi-bing Shen;Qian-cheng Wang
采用基于纳米粒子的平面激光散射方法，对流向涡发生器产生的超音速大尺度涡进行了实验研究，重点研究了超音速混合层中的卷吸和混合特性。起源于K-H不稳定性的展向相干结构随着涡对过程的发展而发展，它们可以存在于后缘下游的远场。发生器产生的大尺度流向旋涡对周围流体从界面两侧卷吸到混合区起主要作用。同时，通过与展向涡的相互作用，流向涡分解为小尺度结构，以利于分子混合。此外，T型结构和二次K-H涡是小尺度湍流输运中常见的拓扑结构。
The supersonic large-scale vortices generated by a streamwise vortex generator were investigated experimentally using the nanoparticle-based planar laser scattering method, with the emphasis on the entrainment and mixing characteristics in supersonic mixing layer. The spanwise coherent structures originated from the K-H instability grew up along with the vortex pairing process, which are able to exist in far field downstream of trailing edge. The large-scale streamwise vortex shed from the generator plays a major role in entraining the surrounding fluid from both sides of interface into mixing zone. Meanwhile, through the interaction with spanwise vortices, the streamwise vortex breaks up into the small-scale structures for molecular mixing. Moreover, the T-shaped structures and secondary K-H vortices are shown to be the usual topological structures in small-scale turbulence transport.