Numerical Investigation of Supersonic Channel Flow with Oscillatory Backpressures
Numerical Investigation of Supersonic Channel Flow with Oscillatory Backpressures
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DOI：
10.4208/aamm.oa-2018-0095
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发表时间：
2019-06
影响因子：
1.4
通讯作者：
Peizhao Sun
中科院分区：
文献类型：
--
作者：
Peizhao Sun
采用大涡模拟方法研究了通道出口处具有周期性振荡背压的超声速通道流动，通道进口自由流马赫数为4，雷诺数约为5.2×104（基于通道高度）。结果已验证仔细对我们的实验数据。三个典型的背压被认为是恒定的背压和两个周期性振荡背压与低和高频率。对于低频情况，振荡背压可以明显影响通道中部区域和高频情况下下游区域的流动特性。在低频反压下，不同相位的相位平均量有明显的差异，而在高频反压下，差异相对较小。频谱分析表明，在低频反压作用下，流场经历了包含激波和涡在内的湍流结构的类周期性演化，由于激波和涡的复杂相互作用，导致湍流脉动增强。AMS科目分类：76F65、76L05、76F70
The investigation of supersonic channel flow with periodic oscillatory backpressures at the outlet of the channel was performed using large-eddy simulation for the inlet free-stream Mach number 4 and the Reynolds number approximately 5.2×104 based on the height of the channel. Results have been validated carefully against our experimental data. Three typical backpressures are considered for constant backpressure and both periodic oscillatory backpressures with low and high frequency. The oscillatory backpressure can obviously influence the flow features occurring up to the middle region of the channel for the low frequency case and the downstream region for the high frequency case. Obvious differences of phase-averaged quantities at different phases are observed for the low frequency backpressure while the differences are relatively small for the high frequency backpressure. The spectral analysis reveals that the flow field experiences a periodic-like evolution of flow structures including shocks and vortices for the low frequency backpressure, resulting in the enhancement of turbulence fluctuations due to the complicated interaction of shocks and vortices. AMS subject classifications: 76F65, 76L05, 76F70