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流动显示和图像处理期刊
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.v6.i1.10
pages 1-17

PIV MEASUREMENTS OF VORTEX EVOLUTION ON AN IMPULSIVELY STARTED WING

Rong F. Huang
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Sun C. Yen
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Chih Y. Huang
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Jen Y. Wu
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Rong-Che Chen
Department of Mechanical and Marine Engineering, National Taiwan Ocean University, Keelung, Taiwan

ABSTRACT

In order to obtain a clear picture of the vortex evolution process on the suction surface of an impulsively started NACA 0012 wing, the qualitative flow visualization method and quantitative measurements of particle imagine velocimeter (PIV) were used. The experiments were conducted in a towing tank. The formation and evolution processes of the vortex system on the suction surface were observed and analyzed by streak pictures of particle images. Four characteristic vortex evolution processes were identified on the domain of angle of attack and chord Reynolds number. The PIV technique was employed to capture the history of the vortical structures. The evolution processes of the streamline patterns, vorticities, traveling paths of vortices, velocities of vortex center, etc. were presented. Stable vortex shedding was eventually established in the wake after complex vortex evolution process of different modes was discussed.


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