| 张华*,穆罕默德·亚民·尤尼斯,胡波,刘尧龙.应用小干扰柱体控制角区马蹄涡结构的实验研究[J].实验力学,2011,26(6):680~685 |
| 应用小干扰柱体控制角区马蹄涡结构的实验研究 |
| Experimental Study of Flow Control in Juncture Region by Using a Small Interfering Cylinder |
| 投稿时间：2011-09-22 修订日期：2011-10-31 |
| DOI： |
| 中文关键词: 角区 分离流 马蹄涡 流动控制 烟线法流动显示 |
| 英文关键词:juncture flow separation flow horseshoe vortex flow control smoke wire flow visualization |
| 基金项目:自然科学基金(10872022)资助项目 |
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| 中文摘要: |
| 本文提出一种简单的抑制和控制角区马蹄涡的被动控制方法。即在角区平板上游放置一个远小于主柱体的小干扰柱体，用其产生的弱马蹄涡来抑制和控制角区的马蹄涡结构。目的是使角区原来的马蹄涡结构由强变为弱、由大变为小、由多变为少、由非定常变为定常，以获得减小冲刷、抑制湍流、降低噪声、避免振动的工程效果。作者在风洞中采用烟线法和激光片光流动显示的方法开展研究，实验表明，在平板上游适当位置放置小干扰柱体的确可以有效抑制和控制角区马蹄涡结构。实验发现，当小干扰柱体放置在原角区马蹄涡生成区时，其抑制和控制效果最佳；当小干扰柱体放置在上游区或下游区时，控制效果不好。本文讨论了小干扰柱体控制角区马蹄涡的机理。此外，实验还研究了小干扰柱体相对尺度和截面形状对角区马蹄涡结构抑制和控制的影响。 |
| 英文摘要: |
| A simple and passive method for restraining and controlling horseshoe vortex in the juncture region is proposed in this paper. Namely, arranging an interfering cylinder, the size of which is much smaller than that of main cylinder and the cross section of which can be any circular, square and triangular, at upstream location of the main circular cylinder mounted on a flat plate, then the horseshoe vortex appeared in juncture region may be restrained and controlled due to the weak horseshoe vortex produced by the interfering cylinder. The purpose is to turn the original horseshoe vortex from strong to weak, from larger to smaller and less, from unsteady to steady, then result in suppressing turbulence, reducing noise, avoiding vibration in engineering. Smoke wire flow visualization and laser light sheet flow visualization were used in the study. Results reveal that the vortex can be eliminated completely or its strength can be reduced significantly by arranging an interfering cylinder at appropriate distance from the leading edge of the juncture region. Results show that the best location arrangement of interfering cylinder is the juncture region, where original horseshoe vortexes appear. The mechanism of using interfering cylinder to weaken the horseshoe vortex structure of the main juncture is also discussed in this paper. Moreover, the effect of cross section shape and geometric parameter such as windward width and aspect ratio of interfering cylinder on the vortex controlling was also experimentally studied. |
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