Experimental Study of Supersonic Entrainment Using a Cavity
Experimental Study of Supersonic Entrainment Using a Cavity
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DOI：
10.2514/1.b35047
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发表时间：
2014-09
影响因子：
1.9
通讯作者：
R. Das;H. Kim;J. Kurian
中科院分区：
文献类型：
--
作者：
R. Das;H. Kim;J. Kurian
研究了壁挂式三维空腔对气体喷射器在马赫数为1.7的超声速流中夹带的影响。研究了由流动不稳定、湍流和腔体与主流流动之间的流体交换引起的夹带。为了明确空腔长度与宽度之比L/W对流体动力学行为的影响，在恒定的长深比L/D下，应用了L/W比在2和4之间的空腔。观察到腔体产生的声波振荡对腔体与自由流之间的质量交换有深远的影响。这些声学振荡反过来又被发现依赖于腔的L/W比。当L/W比从3变为4时，观察到优势声模式的移位。利用激光多普勒测速技术测量了剪切层在腔壁上的溢出和腔内引起的湍流。二次注气的夹带
The effect of wall-mounted three-dimensional cavities on the entrainment of gaseous injectant into a supersonic stream of Mach number 1.7 is studied. Entrainment induced by flow unsteadiness, turbulence, and exchange of fluid between the cavity and mainstream flow has been investigated. To clarify the influence of the ratio of cavity length to width L/W on the fluid dynamic behavior, cavities of L/W ratios between two and four were applied at a constant length-to-depth ratio L/D. Acoustic oscillations generated from the cavity were observed to have profound impact on mass exchange between the cavity and the freestream flow. These acoustic oscillations were in turn found to be dependent on the L/W ratio of the cavity. Shift in dominant acoustic mode was observed as the L/W ratio was changed from three to four. Spillage of the shear layer over the cavity walls and turbulence induced in the cavity were probed by measuring velocity using laser Doppler velocimetry. Entrainment of secondary gaseous injection in...