Experimental investigation on control of vortex shedding mode of a circular cylinder using synthetic jets placed at stagnation points
Experimental investigation on control of vortex shedding mode of a circular cylinder using synthetic jets placed at stagnation points
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驻点合成射流控制圆柱涡旋脱落模态的实验研究
DOI：
10.1007/s11431-012-5074-4
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Li-Hao Feng
中科院分区：
文献类型：
--
作者：
Li-Qun Ma;Li-Hao Feng
利用粒子图像测速 (PIV) 技术在水隧道中对合成射流控制圆柱体周围的流动进行了实验研究。合成射流位于前驻点和后驻点。采用功率谱分析、本征正交分解（POD）法等技术进行数据处理，特别关注圆柱体周围涡结构的控制，其中激励频率fei为固有频率f0的1至3倍，圆柱体雷诺数和激励幅度固定。随着激励频率的增加，合成射流的影响范围扩大，合成射流逐渐在整体流场中占据主导地位。对于自然情况和控制情况atfe/f0=1，前两个POD模式的分布及其POD系数的功率谱都表现出反对称模式的自然脱落的特征。当fe/f0=2和fe/f0=3时，第三和第四POD模态及相应功率谱的变化表明尾流涡脱落模态发生变化，主频率变为激励频率。 Forfe/f0= 2，尾流涡流以反对称或对称模式向下游脱落； forfe/f0=3时，合成射流涡对与两侧近尾流剪切层相互作用，诱发一对对称尾流涡，在下游脱落时逐渐转变为反对称模式。
Control of flow around a circular cylinder by synthetic jets has been experimentally investigated in a water tunnel with particle image velocimetry (PIV) technique. The synthetic jets are positioned at both the front and rear stagnation points. With power spectrum analysis, proper orthogonal decomposition (POD) method and other techniques for data processing, particular attention is paid to the control of vortical structures around the circular cylinder, in which the excitation frequencyfeis one to three times of the natural frequencyf0and the cylinder Reynolds number and the excitation amplitude are fixed. The influenced-scope of the synthetic jet enlarges as the excitation frequency increases, and thus the synthetic jet dominates the global flow field gradually. For the natural case and the control case atfe/f0= 1, the distributions of the first two POD modes and the power spectra for their POD coefficients all exhibit the characteristics of the natural shedding with antisymmetric mode. Forfe/f0= 2 andfe/f0= 3, the variations in the third and fourth POD modes and the corresponding power spectra indicate that the wake vortex shedding mode changes and the dominant frequency becomes the excitation frequency. Forfe/f0= 2, the wake vortex sheds downstream with either the antisymmetric or the symmetric mode; forfe/f0= 3, the synthetic jet vortex pair interacts with the near wake shear layers from both sides to induce a pair of the symmetric wake vortices, which is gradually converted into an antisymmetric mode when shedding downstream.
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影响因子：
4.6
作者：
Wang Jinjun;Feng Lihao;X. Chaojun
通讯作者：
Wang Jinjun;Feng Lihao;X. Chaojun
影响因子：
4.6
作者：
E. Konstantinidis;S. Balabani;M. Yianneskis
通讯作者：
E. Konstantinidis;S. Balabani;M. Yianneskis
参数对轴对称合成射流影响的实验研究
DOI：
10.1016/j.sna.2009.11.006
发表时间：
2010
期刊：
Sensors and Actuators A: Physical
影响因子：
--
作者：
Shan R Q;Shan R Q;Wang J J;Wang J J
通讯作者：
Wang J J
DOI：
10.1007/s11431-008-0174-x
发表时间：
2008-08
期刊：
Science in China Series E: Technological Sciences
影响因子：
--
作者：
Panfeng Zhang;Jinjun Wang;Lihao Feng
通讯作者：
Panfeng Zhang;Jinjun Wang;Lihao Feng
圆柱涡流同步控制，合成射流位于后驻点
影响因子：
3.7
作者：
Feng Lihao;Wang Jinjun
通讯作者：
Wang Jinjun