| 边界层转捩过程中的尖峰结构 |
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| 引用本文： | 郭辉,连淇祥,李岩,王海文. 边界层转捩过程中的尖峰结构[J]. 水动力学研究与进展(A辑), 2003, 18(3): 314-318 |
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| 作者姓名： | 郭辉 连淇祥 李岩 王海文 |
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| 作者单位： | 北京航空航天大学,北京,100083 |
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| 基金项目： | 国家自然科学基金资助项目 ( 16 972 0 0 4 ) |
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| 摘 要： | 利用氢气泡流动显示方法，研究人工激发条件下平板边界层转换的流动现象。实验观测到转换过程中的尖蜂结构(spike structure)，以往这一现象都是热线(膜)测量得到的。流动显示结果证明了关于尖蜂现象的推测，即尖蜂的出现是环状涡对其中心速度诱导的结果，同时观测到伴随高频尖蜂结构的出现，边界层内流动开始紊乱化。
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| 关 键 词： | 氢气泡流动显示 边界层 尖峰结构 扰动激发 环状涡 热线测量 |
| 文章编号： | 1000-4874(2003)03-0314-05 |
| 修稿时间： | 2002-12-12 |
Spike structures in boundary-layer transition |
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| GUO Hui,LIAN Qi xiang,LI Yan,WANG Hai wen. Spike structures in boundary-layer transition[J]. Chinese Journal of Hydrodynamics, 2003, 18(3): 314-318 |
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| Authors: | GUO Hui LIAN Qi xiang LI Yan WANG Hai wen |
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| Abstract: | By use of hydrogen bubble visualization method, flow evolutions are studied in an artificially excited transitional boundary layer on a flat plate. Spike structures are observed, which were only detected before by means of hot wire (film) anemometry. The results verify one of guesses about the formation of spike structures: spike is results of abrupt local velocity fluctuation induced by ring like structures, which are evolved form upstream hairpin vortex. It is also shown that together with the appearance of high frequency spikes, flow breakdown begins to take place. |
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| Keywords: | boundary layer transition flow visualization perturbation excitation |
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