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turbulent boundary layer control with DBD plasma actuators

Plasma Science and Technology 2023年第4期25卷 184-194页

作者：李跃强武斌高超郑海波王玉帅严日华 School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

The flat-plate turbulent boundary layer at Reτ=1140 is manipulated using a spanwise array of bidirectional dielectric barrier discharge(DBD)plasma *** on the features of no moving mechanical parts in the DBD plasma control technology and hot-wire anemometer velocity measurements,a novel convenient method of local drag reduction(DR)measurement is proposed by measuring the single-point velocity within the linear region of the viscous *** analyze the premise of using the method,and the maximum effective measurement range of-73.1%control mechanism is that many meandering streaks are combined together into single stabilized streaks.

关键词： turbulent boundary layer control DBD plasma actuators drag reduction measurement

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turbulent drag reduction by spanwise slot blowing pulsed plasma actuation

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Plasma Science and Technology 2022年第11期24卷 26-36页

作者： Borui ZHENG Yuanzhong JIN Minghao YU Yueqiang LI Bin WU Quanlong CHEN School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Department of Aeronautics and Astronautics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing 401120People’s Republic of China

This work studies the turbulent drag reduction(TDR)effect of a flat plate model using a spanwise slot blowing pulsed plasma actuator(SBP-PA).Wind tunnel experiments are carried out under a Reynolds number of 1.445×10^(4).Using a hot-wire anemometer and an electrical data acquisition system,the influences of millisecond pulsed plasma actuation with different burst frequencies and duty cycles on the microscale coherent structures near the wall of the turbulent boundary layer(TBL)are *** experimental results show that the SBP-PA can effectively reduce the frictional drag of the *** the duty cycle exceeds 30%,the TDR rate is greater than 11%,and the optimal drag reduction rate of 13.69%is obtained at a duty cycle of 50%.Furthermore,optimizing the electrical parameters reveals that increasing the burst frequency significantly reduces the velocity distribution in the logarithmic region of the *** the normalized burst frequency reaches f+=2πf_(p)d/U_(∞)=7.196,the optimal TDR effectiveness is 16.97%,indicating a resonance phenomenon between the pulsed plasma actuation and the microscale coherent structures near the ***,reasonably selecting the electrical parameters of the plasma actuator is expected to significantly improve the TDR effect.

关键词： turbulent boundary layer control plasma flow control hot-wire turbulent frictional drag turbulent drag reduction

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