典型文献
Numerical investigation of flow over a two-dimensional square cylinder with a synthetic jet generated by a bi-frequency signal
文献摘要：
The flow around a square cylinder with a synthetic jet positioned at the rear surface is numerically investigated with the unsteady Reynolds-averaged Navier-Stokes(URANS)method.Instead of the typical sinusoidal wave,a bi-frequency signal is adopted to generate the synthetic jet.The bi-frequency signal consists of a basic sinusoidal wave and a high-frequency wave.Cases with various amplitudes of the high-frequency compo-nent are simulated.It is found that synthetic jets actuated by bi-frequency signals can realize better drag reduction with lower energy consumption when appropriate parameter sets are applied.A new quantity,i.e.,the actuation efficiency Ae,is used to evaluate the controlling efficiency.The actuation efficiency Ae reaches its maximum of 0.2668 when the amplitude of the superposed high-frequency signal is 7.5％of the basic signal.The vortex structures and frequency characteristics are subsequently analyzed to investigate the mechanism of the optimization of the bi-frequency signal.When the synthetic jet is actuated by a single-frequency signal with a characteristic velocity of 0.112 m/s,the wake is asymmetrical.The alternative deflection of vortex pairs and the peak at half of the excitation frequency in the power spectral density(PSD)function are detected.In the bi-frequency cases with the same characteristic velocity,the wake gradually turns to be symmetrical with the increase in the amplitude of the high-frequency component.Mean-while,the deflection of the vortex pairs and the peak at half of the excitation frequency gradually disappear as well.
文献关键词：
中图分类号：
作者姓名：
Yiran LU;Yuan QU;Jiangsheng WANG;Jinjun WANG
作者机构：
Fluid Mechanics Key Laboratory of Education Ministry,Beihang University,Beijing 100191,China
文献出处：
引用格式：
[1]Yiran LU;Yuan QU;Jiangsheng WANG;Jinjun WANG-.Numerical investigation of flow over a two-dimensional square cylinder with a synthetic jet generated by a bi-frequency signal)[J].应用数学和力学（英文版）,2022(10):1569-1584
A类：
B类：
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AB值：
0.486103
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