Experimental Study on Drag Reduction Effect With Traveling Wave Control Using PIV Measurement
Experimental Study on Drag Reduction Effect With Traveling Wave Control Using PIV Measurement
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基于PIV测量的行波控制减阻效果实验研究
DOI：
10.1115/ajkfluids2019-4855
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
A. Murata
中科院分区：
文献类型：
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作者：
I. Suzuki;Takaaki Shimura;A. Mitsuishi;K. Iwamoto;A. Murata
通过在充分发展的湍流双通道流动中使用行波壁的实验，评估了行波控制对流场的影响。我们研制了一个行波发生器，使用橡胶片和压电作动器作为振动源。单个压电致动器安装在通道的上游位置。实验中使用行波在下游方向衰减。在行波控制下，当体雷诺数在2000 < Reb < 6000范围内时，均能有效地实现减阻。当Reb = 3000时，最大减阻率为10%。为了评价行波振幅衰减与减阻效果之间的关系，进行了多位置的粒子图像测速（PIV）。在振动源附近观察到阻力增加，而在其他位置处观察到阻力减小。雷诺切应力的随机分量的减少可以归因于阻力的减少。
The influence of the traveling wave control on flow fields is evaluated by experiments using a traveling wavy wall in a fully developed turbulent dual channel flow. We develop a traveling wave generator using a rubber sheet and piezoelectric actuator as a vibration source. A single piezoelectric actuator is installed in the upstream position of the channel. Experiments are performed using traveling waves attenuating in the downstream direction. With traveling wave control, effective drag reduction is confirmed when bulk Reynolds number is within the range of 2000 < Reb < 6000. For Reb = 3000, the maximum drag reduction rate of 10% is obtained. In order to evaluate a relationship between the amplitude attenuation of traveling wave and drag reduction effect, particle image velocimetry (PIV) at multiple positions is performed. Increase of drag is observed near the vibration source whereas drag decreased at other positions. Reduction of random component of Reynolds shear stress can be ascribed to the drag reduction.