基于合成射流的二维后台阶分离流主动控制

doi:10.7527/S1000-6893.2016.0014

流动控制

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基于合成射流的二维后台阶分离流主动控制

李斌斌¹, 姚勇¹, 顾蕴松², 程克明²

1. 西南科技大学土木工程与建筑学院, 绵阳 621010;
2. 南京航空航天大学航空宇航学院, 南京 210016

收稿日期:2015-11-02 修回日期:2016-01-08 出版日期:2016-06-15 发布日期:2016-01-13
通讯作者: 李斌斌男,博士,讲师。主要研究方向:流动测试与流体流动控制。Tel:0816-2461214 E-mail:libinbin-8@163.com E-mail:libinbin-8@163.com
作者简介:顾蕴松男,教授。主要研究方向:实验空气动力学,流体流动测试与流动控制。Tel:025-84896361 E-mail:yunsongggu@nuaa.edu.cn
基金资助:
空气动力学国家重点实验室基金(JBKY14010201)

Active control of 2D backward facing step separated flow based on synthetic jet

LI Binbin¹, YAO Yong¹, GU Yunsong², CHENG Keming²

1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2015-11-02 Revised:2016-01-08 Online:2016-06-15 Published:2016-01-13
Supported by:
State Key Laboratory Foundation of Aerodynamics (JBKY14010201)

摘要/Abstract

摘要：

作为一种新的流动控制激励器,合成射流技术在流动分离控制、降低压力脉动和抑制噪声等方面具有广阔的应用前景。实验利用合成射流主动控制技术对二维后台阶湍流分离再附流动控制进行了研究,应用表面测压、粒子图像测速(PIV)和热线等多种实验测试技术对后台阶表面压力分布、流场结构以及剪切层特性进行了测试。结果表明,在台阶前缘施加合成射流可有效减小回流区范围和降低再附长度,当合成射流的动量系数为0.301×10^-3时,可使再附点长度减小25%。合成射流控制使得沿台阶下游的湍动能和雷诺应力增强,提高了台阶下游流场的混合效率。热线动态结果表明频率是后台阶分离流动控制的关键参数,当频率为260 Hz、激励频率与剪切层涡脱落频率之比为1.32、激励频率等同于旋涡脱落频率时,合成射流控制效果最好,仅需消耗较小的能量即可实现流动控制的目的。

关键词: 合成射流, 后台阶, 流动控制, 流动分离, 再附点长度

Abstract:

As a new type of flow control actuator, synthetic jet has a potentially broad application in the fields of flow separation control, pressure pulsation reduction and noise suppression. Experimental investigation on 2D backward facing step turbulent separated and reattachment flow control with synthetic jet arrays is conducted, in which the surface pressure distribution of backward facing step, the field structure and the prominent features of shear layer are tested with many experimental devices such as pressure transducers, particle image velocimetry (PIV) and hot wire anemometer. The results show that the perturbation of synthetic jet which is formed at the upper edge of the step can effectively reduce the recirculation zone and reattachment length; when the synthetic jet momentum coefficient is 0.301×10^-3, the non-dimensional length of reattachment decreases by 25% at most. Synthetic jet control increases the turbulent kinetic energy and Reynolds stress along the downstream steps and enhances the mixing efficiency of the flow field along the downstream steps. The hot wire test results show that frequency is the key parameter of backward facing step flow separation control; when the disturbance frequency is 260 Hz, the ratio of disturbance frequency to shear layer vortex shedding frequency is 1.32 and the forcing frequency is equivalent to the vortex shedding frequency, the effect of synthetic jet control is the best and the flow control can be achieved only with low consumption of energy.

Key words: synthetic jet, backward facing step, flow control, flow separation, reattachment length

中图分类号:

V211.7

李斌斌, 姚勇, 顾蕴松, 程克明. 基于合成射流的二维后台阶分离流主动控制[J]. 航空学报, 2016, 37(6): 1753-1762.

LI Binbin, YAO Yong, GU Yunsong, CHENG Keming. Active control of 2D backward facing step separated flow based on synthetic jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(6): 1753-1762.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

基于合成射流的二维后台阶分离流主动控制

Active control of 2D backward facing step separated flow based on synthetic jet

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