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The initial flow structures and oscillations of an underexpanded impinging jet
Aerospace Science and Technology ( IF 5.6 ) Pub Date : 2021-04-29 , DOI: 10.1016/j.ast.2021.106740
Wei Cui , Jinglei Xu , Bing-Chen Wang , Pu Zhang , Qihao Qin

A numerical investigation into an underexpanded round jet impinging vertically onto a flat plate is conducted using large-eddy simulation (LES). The impinging jet features a Mach number of 1.0 at the nozzle exit, a nozzle-pressure ratio of 4.03 and a nozzle-to-plate spacing of 2.08. Three levels of mesh refinement, two temporal discretization schemes and two subgrid-scale (SGS) models are compared. The mean velocity profiles and the dominant impinging tone frequency of the current simulation match the experimental data and the LES results available in the literature. The initial flow structures of the impinging jet are presented to investigate the formation of the flow field and the establishment of the feedback loop. The main processes of the feedback loop are investigated in detail. The oscillations of the Mach disk and the evolutions of the annular shocks and vortex structures are studied. It is observed that the periods of these evolvement processes are identical to that of the acoustic wave generations.



中文翻译:

膨胀不足的射流的初始流动结构和振荡

使用大涡模拟(LES)对垂直向下撞击到平板上的膨胀不足的圆形射流进行了数值研究。射流在喷嘴出口处的马赫数为1.0,喷嘴压力比为4.03,喷嘴与板的间距为2.08。比较了网格细化的三个级别,两个时间离散方案和两个子网格规模(SGS)模型。当前模拟的平均速度曲线和主要的撞击声频率与实验数据相匹配,LES结果可从文献中获得。提出了射流的初始流动结构,以研究流场的形成和反馈回路的建立。详细研究了反馈回路的主要过程。研究了马赫盘的振动以及环形激波和涡旋结构的演化。可以看出,这些演化过程的周期与声波产生的周期相同。

更新日期:2021-05-03
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