Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet

doi:10.1088/1674-1056/ac0da6

中国物理B ›› 2022, Vol. 31 ›› Issue (2): 24702-024702.doi: 10.1088/1674-1056/ac0da6

Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet

Biao-Hui Li(李彪辉)¹, Kang-Jun Wang(王康俊)¹, Yu-Fei Wang(王宇飞)¹, and Nan Jiang(姜楠)^1,2,†

1 Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;
2 Key Laboratory of Modern Engineering Mechanics, Tianjin 300350, China

收稿日期:2021-04-27 修回日期:2021-06-18 接受日期:2021-06-23 出版日期:2022-01-13 发布日期:2022-01-13
通讯作者: Nan Jiang E-mail:nanj@tju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11732010, 11972251, 11872272, 11902218, and 11802195) and the National Key Research and Development Program of China, on ‘Green Buildings and Building Industrialization’ (Grant No. 2018YFC0705300).

Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet

Biao-Hui Li(李彪辉)¹, Kang-Jun Wang(王康俊)¹, Yu-Fei Wang(王宇飞)¹, and Nan Jiang(姜楠)^1,2,†

1 Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;
2 Key Laboratory of Modern Engineering Mechanics, Tianjin 300350, China

Received:2021-04-27 Revised:2021-06-18 Accepted:2021-06-23 Online:2022-01-13 Published:2022-01-13
Contact: Nan Jiang E-mail:nanj@tju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11732010, 11972251, 11872272, 11902218, and 11802195) and the National Key Research and Development Program of China, on ‘Green Buildings and Building Industrialization’ (Grant No. 2018YFC0705300).

摘要/Abstract

摘要： This work investigates the active control of a fully developed turbulent boundary layer by a submerged synthetic jet actuator. The impacts of the control are explored by measuring the streamwise velocities using particle image velocimetry, and reduction of the skin-friction drag is observed in a certain range downstream of the orifice. The coherent structure is defined and extracted using a spatial two-point correlation function, and it is found that the synthetic jet can efficiently reduce the streamwise scale of the coherent structure. Proper orthogonal decomposition analysis reveals that large-scale turbulent kinetic energy is significantly attenuated with the introduction of a synthetic jet. The conditional averaging results show that the induction effect of the prograde vortex on the low-speed fluid in a large-scale fluctuation velocity field is deadened, thereby suppressing the bursting process near the wall.

关键词: synthetic jet, active control, turbulent boundary layer, drag reduction

Abstract: This work investigates the active control of a fully developed turbulent boundary layer by a submerged synthetic jet actuator. The impacts of the control are explored by measuring the streamwise velocities using particle image velocimetry, and reduction of the skin-friction drag is observed in a certain range downstream of the orifice. The coherent structure is defined and extracted using a spatial two-point correlation function, and it is found that the synthetic jet can efficiently reduce the streamwise scale of the coherent structure. Proper orthogonal decomposition analysis reveals that large-scale turbulent kinetic energy is significantly attenuated with the introduction of a synthetic jet. The conditional averaging results show that the induction effect of the prograde vortex on the low-speed fluid in a large-scale fluctuation velocity field is deadened, thereby suppressing the bursting process near the wall.

Key words: synthetic jet, active control, turbulent boundary layer, drag reduction

中图分类号: (Drag reduction)

47.85.lb

47.85.ld (Boundary layer control) 47.27.nb (Boundary layer turbulence ?) 47.27.De (Coherent structures)

Biao-Hui Li(李彪辉), Kang-Jun Wang(王康俊), Yu-Fei Wang(王宇飞), and Nan Jiang(姜楠). Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet[J]. 中国物理B, 2022, 31(2): 24702-024702.

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Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet

Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet

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