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大迎角圆锥前体分离涡流场的显示与测量

发表时间:2013-02-15  浏览量:1300  下载量:381
全部作者: 徐长群,李华星,孟宣市,刘锋,罗时钧
作者单位: 西北工业大学翼型叶栅空气动力国家级重点实验室;美国加州大学尔湾分校机械与宇航工程系
摘 要: 在低速风洞中对细长圆锥-圆柱组合体进行粒子图像显示与测量实验,以研究等离子体激励器对圆锥前体非对称涡的主动控制规律。在大迎角及不同等离子激励形式下,使用粒子成像测速(particle image velocimetry, PIV)系统对圆锥前体某截面的分离涡做了大量的采集和分析工作。实验结果表明:大迎角时,圆锥-圆柱组合体背风面的分离涡是非对称且不稳定的,主涡涡心的位置会大幅跳动。而通过布置在圆锥前体左右两侧等离子体激励器的组合控制,可使分离涡达到定常状态,实现对圆锥前体侧向力的稳定控制。
关 键 词: 流体力学;涡的稳定性;大迎角;细长圆锥前体;非对称分离涡;主动流动控制
Title: Visualization and measurement of vortex flow over conical forebody under high angles of attack
Author: XU Changqun, LI Huaxing, MENG Xuanshi, LIU Feng, LUO Shijun
Organization: National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwestern Polytechnical University; Department of Mechanical and Aerospace Engineering, University of California
Abstract: In order to research the active control characteristics of plasma actuators on the asymmetric vortices over the conical forebody, particle image visualization and measurement experiment on the cone-cylinder combination were carried out in low speed wind tunnel. Under high angles of attack and various lay out of plasma actuators, the asymmetric vortices of conical forebody were investigated using particle image velocimetry (PIV) system. The test results clearly indicated that, when the attack angle was high, the vortices over the leeward side of the cone-cylinder combination was asymmetric and unstable, and the positions of the main vortices changed significantly. By the control of plasma actuators which were fixed on both left and right sides of conical forebody, the separation vortices could achieve steady state and the lateral force of conical forebody could be controlled well.
Key words: fluid mechanics; stability of vortices; high angles of attack; slender conical forebody; asymmetrical vortices; active flow control
发表期数: 2013年2月第3期
引用格式: 徐长群,李华星,孟宣市,等. 大迎角圆锥前体分离涡流场的显示与测量[J]. 中国科技论文在线精品论文,2013,6(3):279-283.
 
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