The Impact of Steady Blowing from the Leading Edge of an Open Cavity Flow
The Impact of Steady Blowing from the Leading Edge of an Open Cavity Flow
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DOI：
10.3390/aerospace8090255
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发表时间：
2021-09
期刊：
影响因子：
2.6
通讯作者：
N. A. Haddabi;K. Kontis;H. Zare-Behtash
中科院分区：
文献类型：
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作者：
N. A. Haddabi;K. Kontis;H. Zare-Behtash
空腔流在低速（马赫数≤0.3）的应用范围很广，如飞机轮威尔斯、地面运输和管道。在当前的研究中，一个稳定的射流被迫从一个空腔的前缘在不同的动量通量（0.11 kg/m·s2，0.44 kg/m·s2，和0.96 kg/m·s2）。研究是在雷诺数下对长深比为4的开放空腔进行的，空腔深度约为50，000。粒子图像测速，表面油流可视化，恒温风速仪，和压力测量进行了这项调查。喷吹的目的是将空腔分离剪切层与回流区分离，以减少空腔回流，从而稳定空腔分离剪切层。结果发现，增加射流动量通量的空腔回流由于空腔分离剪切层的厚度的增加而导致增加。该研究还发现，射流填充分离的剪切层与大量的小尺度扰动。这些扰动增加了空腔分离剪切层中压力功率谱和雷诺剪应力的宽带水平。另一方面，喷流扰动使大涡结构的脱落更加间歇。
Cavity flows occur in a wide range of low-speed applications (Mach number ≤0.3), such as aircraft wheel wells, ground transportation, and pipelines. In the current study, a steady jet is forced from a cavity leading edge at different momentum fluxes (0.11 kg/ms2, 0.44 kg/m·s2, and 0.96 kg/m·s2). The investigation was performed for an open cavity with length to depth ratio of 4 at the Reynolds number based on a cavity depth of approximately 50,000. Particle image velocimetry, surface oil flow visualisation, constant temperature anemometry, and pressure measurements were performed in this investigation. The aim of the jet blowing is to separate the cavity separated shear layer from the recirculation zone to reduce the cavity return flow, and hence stabilise the cavity separated shear layer. It was found that increasing the jet momentum flux causes an increase in the cavity return flow due to the increase in the thickness of the cavity separated shear layer. The study also found that the jet populates the separated shear layer with a large number of small-scale disturbances. These disturbances increase the broad band level of the pressure power spectra and Reynolds shear stress in the cavity separated shear layer. On the other hand, the jet disturbances make the shedding of the large vortical structures more intermittent.