Coherent structure evolution and entrainment effect of dual synthetic jets: effect of operating frequency

Liu Yuanyuan; Liang Xinyu; Peng Wenqiang; Zhao Zhijie; Deng Xiong; Luo Zhenbing

doi:10.7638/kqdlxxb-2025.0108

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Coherent structure evolution and entrainment effect of dual synthetic jets: effect of operating frequency

更新时间：2026-07-11

- Coherent structure evolution and entrainment effect of dual synthetic jets: effect of operating frequency
- Vol. 44, Issue 6, Pages: 1-13(2026)
- 作者机构：
  
  国防科技大学空天科学学院,长沙,410073
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2025.0108
  CLC： O358
- Published：2026
- 稿件说明：
移动端阅览
刘源园, 梁欣宇, 彭文强, 等. 合成双射流的相干结构演化与卷吸效应：工作频率的影响[J]. 空气动力学学报, 2026, 44(6): 1−13.

Liu Yuanyuan, Liang Xinyu, Peng Wenqiang, et al. Coherent structure evolution and entrainment effect of dual synthetic jets: effect of operating frequency[J]. 2026, 44(6): 1-13.
刘源园, 梁欣宇, 彭文强, 等. 合成双射流的相干结构演化与卷吸效应：工作频率的影响[J]. 空气动力学学报, 2026, 44(6): 1−13. DOI： 10.7638/kqdlxxb-2025.0108

Liu Yuanyuan, Liang Xinyu, Peng Wenqiang, et al. Coherent structure evolution and entrainment effect of dual synthetic jets: effect of operating frequency[J]. 2026, 44(6): 1-13. DOI： 10.7638/kqdlxxb-2025.0108.

摘要

合成双射流由两股相位差为180°的合成射流在下游融合形成，具有更强的动量通量、更远的穿透深度和更低的工作噪声，在流动控制领域有广阔的应用前景。然而，工作频率对其相干结构演化和卷吸效应的影响机制尚不清晰。本文采用高频粒子图像测速系统测量了长宽比

= 10，工作频率

= 650、850、

1050

和

1250

Hz的合成双射流的瞬时流场，并结合速度三重分解与旋涡四象限规则分析其相位平均流场和时均流场中的相干结构，还通过质量流率和动量通量对其卷吸能力进行了定量分析。结果表明，自给现象会加速合成双射流涡环曲率变化，抑制内侧旋涡卷起的同时拉扯整个涡环。这致使初级旋涡变形并分裂形成次级旋涡，促进短轴平面涡量向长轴平面转变，导致初级旋涡更快失去相干性并发生坍缩。工作频率

= 650和850 Hz的时均流场具有较高的相似度，湍动能强度较低，在较大的范围内均有分布，周期动能在流场内占据主导地位，且主要集中在射流口附近。随着工作频率增大（

1050

和

1250

Hz），初级旋涡更易坍缩进而失去相干性，此时小尺度涡融合和破碎引起的湍动能在流场中占主导，周期动能主要集中在初级旋涡卷起的区域。合成双射流对环境流体的卷吸能力并不仅仅由射流雷诺数或斯特劳哈尔数决定，还与旋涡演化的形态有关。次级旋涡的生成与演化可以增强射流的卷吸能力，使其在较低的射流雷诺数下仍具有较高的质量流率与动量通量；而这一过程受工作频率的调控，其通过改变初级旋涡演化形态，进而改变质量流率和动量通量的流向演化规律。本研究可为合成双射流激励器的参数优化与工程应用提供参考。

Abstract

Dual synthetic jets are formed by the downstream merging of two synthetic jets with a phase difference of 180°

featuring stronger momentum flux

greater penetration depth

and lower operating noise. This technology has broad application prospects in the field of flow control. This study measured the instantaneous flow fields of dual synthetic jets with an aspect ratio

= 10 at operating frequencies

= 650

850

1050

and

1250

Hz by high-frequency particle image velocimetry. Coherent structures in the phase-averaged and time-averaged flow fields were analysed based on the velocity triple decomposition method and four-quadrant rule

and the entrainment capacity of the dual synthetic jets was quantitatively evaluated through mass flow rate and momentum flux. The results show that the self-support phenomenon accelerates the curvature change of the vortex ring

inhibiting the formation of inner vortices while pulling the entire vortex ring. These causes the primary vortex to deform and split off to form a secondary vortex

and promotes the transformation of minor-axis plane vorticity into the major-axis plane

leading to faster loss of coherence and collapse of the primary vortex. The time-averaged flow fields at

= 650 and 850 Hz exhibit a high degree of similarity

with the turbulent kinetic energy being relatively low and distributed over a large range. The periodic kinetic energy plays a dominant role in the flow field

and is mainly concentrated near the orifices. As the operating frequency increases

primary vortices are more susceptible to collapse

leading to a rapid loss of coherence. The turbulent kinetic energy caused by vortices breaking and merging becomes dominant in the flow field (

1050

and

1250

Hz)

and the periodic kinetic energy is mainly concentrated in the region where primary vortices are formed. The entrainment capacity of dual synthetic jets is not solely determined by the jet Reynolds number (

) or the Strouhal number (

)

but is also closely related to the pattern of vortex evolution. The generation and development of secondary vortices can enhance the entrainment capacity

allowing the jet to maintain a high mass flow rate and momentum flux even at lower

. This process is regulated by the operating frequency

which alters the evolution pattern of the primary vortex and thereby changes the streamwise evolution of the mass flow rate and the momentum flux. This study can provide a reference for the parameter optimization and engineering application of the dual synthetic jet actuator.

关键词

Keywords

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