Circular cylinder vortex-synchronization control with a synthetic jet positioned at the rear stagnation point
Circular cylinder vortex-synchronization control with a synthetic jet positioned at the rear stagnation point
复制标题
圆柱涡流同步控制，合成射流位于后驻点
DOI：
10.1017/s0022112010003174
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
Wang Jinjun
中科院分区：
文献类型：
--
作者：
Feng Lihao;Wang Jinjun
在圆柱雷诺数Re = 950的水槽中，对位于平均后驻点的二维合成射流控制下的圆柱绕流进行了实验研究。这是一个创新的安排和粒子图像测速测量表明，它可以导致一个新的和有趣的现象。出口附近诱导的合成喷流涡对向下游对流，并与圆柱两侧后面的涡量剪切层相互作用，形成新的诱导尾涡。在无量纲冲程长度为99.5时，当合成射流的激励频率在自然脱落频率的1.67和5.00倍之间时，出现了当前的涡同步。然而，它表明，合成射流涡对的强度起着更重要的作用，在涡同步的发生比激励频率。此外，尾涡脱落从原来的反对称模式转换为对称模式。对称脱落模式减弱了上下尾涡之间的相互作用，导致它们产生的湍流动能减小。它也有显着的影响，全球流场，包括速度波动，雷诺应力和流动拓扑结构。然而，它们的分布仍然由大尺度相干结构所支配。
The flow over a circular cylinder controlled by a two-dimensional synthetic jet positioned at the mean rear stagnation point has been experimentally investigated in a water channel at the cylinder Reynolds number Re = 950. This is an innovative arrangement and the particle-image-velocimetry measurement indicates that it can lead to a novel and interesting phenomenon. The synthetic-jet vortex pairs induced near the exit convect downstream and interact with the vorticity shear layers behind both sides of the cylinder, resulting in the formation of new induced wake vortices. The present vortex synchronization occurs when the excitation frequency of the synthetic jet is between 1.67 and 5.00 times the natural shedding frequency at the dimensionless stroke length 99.5. However, it is suggested that the strength of the synthetic-jet vortex pair plays a more essential role in the occurrence of vortex synchronization than the excitation frequency. In addition, the wake-vortex shedding is converted into a symmetric mode from its original antisymmetric mode. The symmetric shedding mode weakens the interaction between the upper and lower wake vortices, resulting in a decrease in the turbulent kinetic energy produced by them. It also has a significant influence on the global flow field, including the velocity fluctuations, Reynolds stresses and flow topology. However, their distributions are still dominated by the large-scale coherent structures.
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影响因子：
2.2
作者：
Akilli, H;Sahin, B;Tumen, NF
通讯作者：
Tumen, NF
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
T. Guang;Li Qiu
通讯作者：
T. Guang;Li Qiu
影响因子：
2
作者：
O. Griffin;M. Hall
通讯作者：
O. Griffin;M. Hall
影响因子：
4.6
作者：
B. J. Armstrong;F. H. Barnes;I. Grant
通讯作者：
B. J. Armstrong;F. H. Barnes;I. Grant
影响因子：
2.4
作者：
E. Detemple-Laake;H. Eckelmann
通讯作者：
E. Detemple-Laake;H. Eckelmann