等离子体对流动湍动能的控制

doi:10.7527/S1000-6893.2015.0250

流体力学与飞行力学

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等离子体对流动湍动能的控制

王斌, 李华星

西北工业大学航空学院, 西安 710072

收稿日期:2015-07-23 修回日期:2015-09-11 出版日期:2015-12-15 发布日期:2015-12-28
通讯作者: 李华星,Tel.:029-88460793,E-mail:hxli@nwpu.edu.cn E-mail:hxli@nwpu.edu.cn
作者简介:王斌,男,博士研究生。主要研究方向:理论空气动力学与流动控制。Tel:029-88460793,E-mail:wang_bin262@163.com;李华星,男,博士,教授,博士生导师。主要研究方向:理论空气动力学与流动控制及实验空气动力学。Tel:029-88460793,E-mail:hxli@nwpu.edu.cn

Control of flow turbulent kinetic energy by plasma

WANG Bin, LI Huaxing

School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China

Received:2015-07-23 Revised:2015-09-11 Online:2015-12-15 Published:2015-12-28

摘要/Abstract

摘要：

在湍流流动中,雷诺应力是一个能够影响平均流动的重要动态量,它可以在很大程度上影响湍流中动能的传输,强烈影响表面摩擦力,对于摩擦阻力和流动的分离起着至关重要的作用。因此,本文的实验目的是:针对后台阶流动,特别设计了能够沿着45°方向形成射流的直角形状等离子体激励器对后台阶流动中的雷诺应力进行控制,同时实现对后台阶流动再附着位置的改变。实验过程中,按照台阶后流向位置0.5H(H为台阶高度)的自然不稳定性频率对直角形状等离子体激励器的脉冲频率进行调制。使用PIV对台阶后0~2.5H的区域以及再附着区域进行测量。实验结果表明:在直角形状等离子体激励器开启后,在台阶后0~2.5H的区域,围绕剪切层及其附近区域的雷诺应力各分量在最大数值上分别增加了42%(流向雷诺正应力),75%(垂向雷诺正应力),46%(雷诺切应力),湍动能产生项在最大数值上减小了35%。在再附着区域,后台阶流动的再附着位置也向台阶的上游发生了移动。

关键词: 流动控制, 等离子体, 雷诺应力, 湍流能量, PIV

Abstract:

As an important dynamic quantity affecting the mean flow in the turbulent flow, the Reynolds stress greatly affects the momentum transfer in turbulent flows, and thus strongly influences the skin friction. Therefore, it plays a key role in friction drag and flow separation. The purpose of this article is to present the flow control with specially designed right-angle-shaped plasma actuator, which can emit jet at about 45° to manipulate the Reynolds stress and meanwhile to alter the reattachment location in the backward-facing step flow. In the experiment, the plused frequencies of the right-angle-shaped plasma actuator are modulated by the natural instability frequency at 0.5H (H means step height) streamwise position of the backward-facing step flow. The region from 0 to 2.5H is measured by particle image velocimetry (PIV), and the reattachment zone is also measured by PIV. The results show that when the right-angle-shaped plasma actuator is turned on, the maximum of Reynolds stress components in the region centered on the shear layer and near the shear layer are significantly increased by about 42% (Horizontal normal stress), by 75% (Vertical normal stress), and by 46% (Reynolds shear stress), and the maximum of the turbulent kinetic energy production in the region centered on the shear layer is reduced by about 35%.The reattachment location is moved upstream in the reattachment zone.

Key words: flow control, plasma, Reynolds stress, turbulent energy, particle image velocimetry (PIV)

中图分类号:

V211

王斌, 李华星. 等离子体对流动湍动能的控制[J]. 航空学报, 2015, 36(12): 3809-3821.

WANG Bin, LI Huaxing. Control of flow turbulent kinetic energy by plasma[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(12): 3809-3821.

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等离子体对流动湍动能的控制

Control of flow turbulent kinetic energy by plasma

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