高频吹气扰动影响近壁区拟序结构统计特性的实验研究

王艳平; 郭昊; 刘沛清; 黄乾旻

doi:10.6052/0459-1879-14-381

高频吹气扰动影响近壁区拟序结构统计特性的实验研究

北京航空航天大学流体力学教育部重点实验室, 北京100191

基金项目: 国家自然科学基金(11272034)、民用飞机国际合作专项《MARS》(MJ-F-2011-05) 和水利部黄河泥沙重点实验室开放课题基金资助项目.

详细信息

通讯作者:
郭昊, 讲师, 主要研究方向:湍流减阻控制. E-mail:guohao@buaa.edu.cn

中图分类号: O357
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出版历程
- 收稿日期: 2014-11-27
- 修回日期: 2015-05-18
- 刊出日期: 2015-07-17

EFFECTS OF HIGH FREQUENCY BLOWING PERTURBATION ON A TURBULENT BOUNDARY LAYER

Institute of Fluid Mechanics, Beihang University, Beijing 100190, China

Funds: The project was supported by the National Natural Science Foundation of China (11272034), the China-EU Aeronautical Science & Technology Cooperation Project MARS (MJ-F-2011-05) and Key Laboratory of Ministry of Water Resources of the Yellow River Sediment Research Fund Project.

摘要

摘要: 利用恒温热线风速仪测量了零压力梯度平板上施加由合成射流激发的狭缝周期吹气扰动前后不同流向位置湍流边界层的速度信号, 展开高频吹气扰动影响近壁区湍流结构的统计特性研究. 研究结果表明:高频周期吹气扰动在狭缝下游产生明显的减阻效果. 扰动强度在湍流边界层内的发展沿流向呈衰减趋势, 其与湍流结构的相互作用也相应衰减. 然而, 因高频扰动产生运动的展向涡结构与猝发引起的结构变化尺度相当, 直接影响了近壁区拟序结构产生与发展的统计, 从而使得猝发检测方法VITA 表现出与低频或定常吹气减阻机理相异的现象.
- 高频吹气扰动 /
- 湍流边界层 /
- 减阻 /
- 合成射流
Abstract: An experimental study is conducted on a zero pressure gradient flat plate for investigating the effects of a periodical perturbation on the turbulent boundary layer over the flat plate. This experiment is focused on studying the effects of high frequency blowing on statistical characteristicss of near wall turbulence. By measuring and analyzing streamwise velocity signals at different streamwise locations with and without a periodical perturbation induced by a synthetic jet actuator, the conclusion of the experiment indicates skin friction reduction can be achieved downstream of the slot by applying high frequency periodical blowing perturbation. Owing to the intensity of the perturbation in the turbulent boundary layer is attenuating along the streamwise, the interaction between the perturbation and turbulent flow structures is attenuating. However, the negative spanwise vortexes induced by the high frequency perturbation are nearly of the same scale as the structures of bursting events, which directly impact the statistics of production and evolution of near wall coherent structures. As a result, the outcomes of bursting detection methods like VITA in the experiment show a contradictory phenomenon to the mechanism of skin friction reduction in low frequency blowing or steady blowing.
- high frequency blowing perturbation /
- turbulent boundary layer /
- skin friction reduction /
- synthetic jet

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