VORTEX BREAKDOWN FROM A PITCHING DELTA WING INCIDENT UPON A PLATE: FLOW STRUCTURE AS THE ORIGIN OF BUFFET LOADING
VORTEX BREAKDOWN FROM A PITCHING DELTA WING INCIDENT UPON A PLATE: FLOW STRUCTURE AS THE ORIGIN OF BUFFET LOADING
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DOI：
10.1006/jfls.2001.0427
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发表时间：
2002-04
影响因子：
3.6
通讯作者：
M. Ozgoren;B. Şahin;D. Rockwell
中科院分区：
文献类型：
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作者：
M. Ozgoren;B. Şahin;D. Rockwell
摘要三角翼同时受到迎角的静态和动态变化的影响，来自机翼的旋涡撞击在静止的平板上。采用高图像密度粒子图像测速技术，比较了有无冲击板时的旋涡发展模式。对于迎角静态变化的极限情况，板的存在对涡破裂的发生有很大的影响。相反，迎角的动态（非定常）变化产生的破裂位置的变化，对于有和没有冲击板的情况，一般是相似的。涡破裂-板相互作用的详细结构由瞬时速度和涡度的模式表示，其作为板表面的抖振诱导载荷的起源。
Abstract A delta wing is subjected to both static and dynamic variations of angle-of-attack; the vortices from the wing impinge upon a stationary plate. A technique of high-image-density particle image velocimetry is employed to compare the patterns of vortex development with and without the impingement plate. For the limiting case of static variations of angle-of-attack, the presence of the plate exerts a large influence on the onset of vortex breakdown. In contrast, dynamic (unsteady) variation of angle-of-attack yields changes of breakdown location that are generally similar for cases with and without the impingement plate. The detailed structure of the vortex breakdown-plate interaction is represented by patterns of instantaneous velocity and vorticity, which serve as the origin of buffet-induced loading of the surface of the plate.