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|標題:||Unsteady vortex structure over delta-wing subject to transient along-core blowing||作者:||Kuo, C.H.
|關鍵字:||vortical structure;breakdown||Project:||Aiaa Journal||期刊/報告no：:||Aiaa Journal, Volume 36, Issue 9, Page(s) 1658-1664.||摘要:||
Unsteady vortex structure over a delta-wing in response to the transient along-core blowing is investigated by velocity measurements and the phase-trigger technique. The wing geometry has a 75-deg sweep angle and is at a 40-deg angle of attack. The changes of the along-core and the swirling velocity components are related to illustrate the evolution of the vortex structure when the transient blowing is applied along the axis of the vortex core. It is found that the highly sensitive character of the central region of the vortex core occurs not only in the along-core direction but also in the circumferential direction. Within the stable vortex core, the along-core velocity in response to the transient along-core blowing must change in accordance with the swirling velocity. The magnitudes of the along-core and the swirling velocity components within the stable vortex core must satisfy the stability parameter and the limitation of the maximum swirl angle. The maximum swirl angle within the stable vortex core is nearly the same both in the case of transient along core blowing and in the unperturbed case. When the transient along-core blowing is introduced, increasing magnitudes in both the along-core and the swirling velocity components tend to enlarge the favorable pressure gradient along the vortex center. This leads to the substantial delay of the vortex breakdown location.
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