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Effects of vortex generators on unsteady unstarted flows of an axisymmetric inlet with nose bluntness

机译：涡流发生器对鼻钝性轴对称入口不稳定流动的影响

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Shock tunnel tests and CFD simulations are conducted to study effects of vortex generators (VGs) on unsteady unstarted flows of an axisymmetric hypersonic inlet with nose blunt radii of 0.8 mm and 3.2 mm. The inlet exit is throttled with a preseted block to generate unstarted flows at a freestream Mach number of 5.9. Unstarted flows of no VGs, 0.5 mm and 1 mm-thick VGs are recorded through schlieren imaging and pressure measurements. Experimental results show that the unstarted flows are characterized with prominent shock oscillations and pressure fluctuations. VGs reduce scales of the external separations, enlarge angles of the separated shock waves, and increase time-averaged magnitudes of surface pressures. The oscillatory period can be shortened from 4 ms to 3.13 ms by 1 mm-thick VGs for the R0.8 mm configuration. The maximum increment of the time-averaged pressure magnitudes can reach 16.2 times the freestream static pressure (p(infinity)) for the R0.8 mm configuration with 1 mm-thick VGs. In addition, VGs generally increase pressure standard deviations of the measuring points upstream of the throat section within 4.0 p(infinity) and decrease those of the downstream measuring points up to 8.6p(infinity), despite the 0.5 mm-thick VGs condition of the R3.2 mm configuration. Flow mechanisms dominating the effects of VGs on the unsteady unstarted flows are analyzed with the aid of the CFD simulations. Feasibility of VGs on unstarted flow control is also evaluated. (c) 2020 Elsevier Masson SAS. All rights reserved.
机译：进行冲击隧道试验和CFD模拟，以研究涡流发生器（VGS）对不稳定的未启动的轴对称过度入口流量的影响，鼻钝性半径为0.8mm和3.2mm。入口出口用预定块节流，以在FreeStream Mach数为5.9的FreeStream Mach数中产生未启动的流量。通过Schlieren成像和压力测量，记录0.5mm和1 mm厚VG的未启动的无VGS的流量。实验结果表明，未启动的流量的特征在于突出的冲击振荡和压力波动。 VGS减小外部分离的尺度，放大分离的冲击波的角度，并增加了表面压力的时间平均量大。对于R0.8 mm配置，可以将振荡周期从4 ms缩短为3 ms至3.13ms。时间平均压力幅度的最大增量可以达到FreeStream静压（P（Infinity）的R0.8 mm配置的16.2倍，具有1 mm厚的VGS。此外，尽管较为0.5mm厚的VGS条件，但VGS通常会增加喉部上游上游的测量点的压力标准偏差，并降低了下游测量点的下游测量点（无限），尽管如此R3.2 mm配置。通过CFD模拟分析主导VGS对不稳定未启动的流量的影响的流动机制。还评估了VGS对未启流流量控制的可行性。 （c）2020 Elsevier Masson SAS。版权所有。

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