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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Control of flow around a square prism by slot jet injection from the rear surface
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Control of flow around a square prism by slot jet injection from the rear surface

机译：通过从后表面喷射狭缝喷射来控制方形棱镜周围的流动

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摘要

The flow around a square prism with slot jet injection from its base into the vortex formation region has been investigated experimentally for Reynolds number of 8000. For various injection rates, the mean and fluctuating pressure distributions on the square prism were measured and the velocity measurements were carried out by using a hot-wire anemometer. Flow visualization was performed by using the smoke-wire method. It was found that the slot jet injection has a substantial influence on the flow characteristics of the square prism. Increase of the injection ratio up to a certain value causes an important pressure recovery in the wake. For this lower range of blowing rates, blowing fluid tends to fill the wake region around the prism and extend it but the jet does not have enough momentum to penetrate the main vortices. By the further increasing of the blowing rate, the slot jet injection from the base side of the prism splits the near wake like a splitter plate. This causes a thinner wake width and weak vortices resulting in a higher vortex shedding frequency.
机译：实验研究了雷射数为8000时通过狭缝喷射从其底部进入涡旋形成区域的方棱镜周围的流动。对于各种注入速率，测量了方棱镜上的平均压力和脉动压力分布，并测量了速度。使用热线风速计进行。通过使用烟丝法进行流动可视化。发现狭缝喷射注入对方形棱镜的流动特性有很大影响。喷射比增加到一定值会引起尾流中的重要压力恢复。对于较低的吹风速率范围，吹风流体往往会充满棱镜周围的尾流区域并使其延伸，但射流的动量不足以穿透主旋涡。通过进一步提高吹出速度，从棱镜的底侧喷射的缝隙射流像分隔板一样将近尾流分开。这将导致较薄的尾流宽度和较弱的涡旋，从而导致较高的涡旋脱落频率。

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