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Numerical investigation of efficient synthetic jets generated by multiple-frequency actuating signals

多频激励信号产生高效合成射流的数值研究

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Abstract

The synthetic jets generated by multiple-frequency actuating signals composed of a basic sinusoidal wave and a superposed high-frequency signal is investigated by two-dimensional simulation in the present study. The effect of the frequency and amplitude of the high-frequency signal on the synthetic jet in the quiescent flow is investigated in detail with stroke length ratio L and Reynolds number \(R{e_{{U_0}}}\) kept as constant. It is found that, with the high-frequency signal superposed, the vortex pairs induced by the synthetic jets are strengthened and accelerated. The distance that the vortex pairs can propagate downstream is also elongated. The entrainment of the synthetic jets is thus enhanced as well. The optimal design is reached when the frequency ratio, defined as the ratio between the superposed signal frequency and the basic signal frequency, is fixed at f+ = 2. At this optimal frequency ratio, the jet entrainment increases monotonously with the amplitude of the high-frequency signal.

摘要

通过二维模拟研究了由基本正弦波和叠加高频信号组成的多频激励信号产生的合成射流. 在冲程长度比L和雷诺数\(R{e_{{U_0}}}\)不变的情况下, 详细研究了高频信号的频率和振幅在净水环境中合成射流的影响. 研究结果表明, 随着高频信号的叠加, 合成射流诱导产生的涡对强度和运动速度均有所增大. 涡对向下游传播的距离也有所增加. 因此, 合成射流的卷吸作用也会增强. 当频率比(定义为叠加信号频率与基本信号频率之间的比率)固定在f+ = 2时达到最优. 在这个最佳频率比下, 射流卷吸作用随高频信号的幅值单调增加.

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Authors and Affiliations

  1. Key Laboratory of Fluid Mechanics (Beijing University of Aeronautics and Astronautics), Ministry of Education, Beijing, 100191, China

    Yiran Lu  (陆逸然), Jiangsheng Wang  (王将升) & Jinjun Wang  (王晋军)

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  1. Yiran Lu  (陆逸然)
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  2. Jiangsheng Wang  (王将升)
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  3. Jinjun Wang  (王晋军)
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Corresponding author

Correspondence to Jinjun Wang  (王晋军).

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 11721202).

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Lu, Y., Wang, J. & Wang, J. Numerical investigation of efficient synthetic jets generated by multiple-frequency actuating signals. Acta Mech. Sin. 38, 321177 (2022). https://doi.org/10.1007/s10409-021-09015-x

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