Parametric study of high-frequency characteristics of plasma synthetic jet actuator

Guozheng SONG (宋国正); Haohua ZONG (宗豪华); Hua LIANG (梁华); Zhi SU (苏志); Like XIE (谢理科); Xing ZHENG (郑猩)

doi:10.1088/2058-6272/ac30d7

Plasma Science and Technology > 2021 > 23(12): 125503. > DOI: 10.1088/2058-6272/ac30d7

Guozheng SONG (宋国正), Haohua ZONG (宗豪华), Hua LIANG (梁华), Zhi SU (苏志), Like XIE (谢理科), Xing ZHENG (郑猩). Parametric study of high-frequency characteristics of plasma synthetic jet actuator[J]. Plasma Science and Technology, 2021, 23(12): 125503. DOI: 10.1088/2058-6272/ac30d7

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Parametric study of high-frequency characteristics of plasma synthetic jet actuator

¹ Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi'an 710038, People's Republic of China
² School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China

Funds: This research work is supported by National Natural Science Foundation of China (No. 12002384), the National Key Laboratory Foundation of China (No. 614220210200112), and the Foundation Strengthening Project (No. 2019-JCJQ-JJ-077).

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Received Date: September 01, 2021
Revised Date: October 16, 2021
Accepted Date: October 17, 2021

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Abstract

Abstract

A major issue of plasma synthetic jet actuator (PSJA) is the severe performance deterioration at high working frequency. In this study, experiments and numerical simulation are combined together to investigate the influence of thermal conductivity, throat length (L_th) and discharge duration (T_d) on the high-frequency characteristics of PSJA. Results show that the variation of the actuator thermal conductivity and discharge duration will not alter the saturation frequency of the actuator, whereas decreasing the throat length results in an increase of the saturation frequency. For a short-duration capacitive discharge of 1.7 μs, a clear shock wave is issued from the orifice, followed by a weak jet. As a comparison, when the discharge duration is increased up to 202.6 μs, a strong jet column is formed and no obvious shock wave can be visualized. Based on numerical simulation results, it becomes clear that the long-duration pulse-DC discharge is able to heat the cavity gas to a much higher temperature (3141 K) than capacitive discharge, greatly improving the conversion efficiency of the arc discharge energy to the internal energy of the cavity gas. In addition, high-speed Schlieren imaging is deployed to study the performance degradation mechanism of PSJA at high working frequency. Monitor of the exit jet grayscale indicates that as long as the saturation frequency is exceeded, the actuator becomes unstable due to insufficient refresh time. The higher the discharge frequency, the more frequently the phenomenon of 'misfires' will occur, which explains well the decaying jet total pressure at above saturation frequency.
- thermal conductivity,
- throat length,
- discharge duration,
- plasma synthetic jet,
- saturation frequency

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References

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Parametric study of high-frequency characteristics of plasma synthetic jet actuator