Flow Around a Circular Cylinder with Tangential Blowing near a Plane Boundary (1st Report, A Study on Fluid Force)
Flow Around a Circular Cylinder with Tangential Blowing near a Plane Boundary (1st Report, A Study on Fluid Force)
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平面边界附近具有切向吹气的圆柱体周围流动（第一份报告，流体力研究）
DOI：
10.1299/kikaib.73.1790
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
O. Furuya
中科院分区：
文献类型：
--
作者：
Shimpei Okayasu;Kotaro Sato;T. Shakouchi;O. Furuya
在Re=2.7× 10 ~ 4的条件下，对切向吹气作用下的圆柱绕流进行了实验研究。在不同动量系数Cμ和圆柱与刚性平面边界之间的间隙的情况下，进行了圆柱表面的时均压力测量和流动显示。根据这些表面压力分布计算圆柱上的流体力。实验结果表明，在一定的Cμ处，升力达到最大值，然后开始下降，而在开式流场中，圆柱体的升力没有出现这种趋势。据认为，该现象是由于在圆柱周围的流动模式的变化，更具体地说，由于在差距中的反向流动的发生。此外，升力特性可用新定义的名义射流系数C 'μ和名义升力系数C' L来表示。
The flow around a circular cylinder, which is placed near a rigid plane boundary, with tangential blowing is investigated experimentally under the condition of Re=2.7×104. The time-mean surface pressure measurements on the circular cylinder and flow visualizations were carried out for various momentum coefficient Cμ and clearances between the circular cylinder and the rigid plane boundary. The fluid force on the circular cylinder was calculated from these surface pressure distributions. The results of experiment show that the lift reaches the maximum value at certain Cμ and then starts decreasing, and this tendency has never been observed for the cylinder placed in the open flow field. It is considered that the phenomenon is attributed to change in the flow pattern around the circular cylinder, more specifically, due to the occurrence of reverse flow in the gap. In addition, the characteristics of the lift forces can be represented by newly defined nominal jet coefficient C'μ and nominal lift coefficient C'L.