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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。
In this paper, a simple passive control method of suppressing and controlling horseshoe vortex in the corner region is proposed. That is, a small interference cylinder much smaller than the main cylinder is placed upstream of the plate in the corner zone, and the weak horseshoe vortex generated by it is used to restrain and control the horseshoe vortex structure in the corner zone. The purpose is to change the original horseshoe vortex structure in the corner region from strong to weak, from large to small, from mutable to less, from unsteady to steady, to obtain a reduction of erosion, turbulence suppression, noise reduction and vibration avoidance Engineering effect. In the wind tunnel, the smoke line method and the laser light flow display method are used. The experiments show that placing the small interfering cylinder in the proper position upstream of the slab can effectively suppress and control the horseshoe vortex structure in the corner zone. Experiments show that when the small interference cylinder placed in the original angular zone horseshoe vortex generation zone, the inhibition and control of the best; when the small interference cylinder placed in the upstream zone or downstream zone, the control effect is not good. This paper discusses the mechanism of the horseshoe vortex in the small corner cylinder control corner. In addition, the influence of the relative scale and cross-sectional shape of the small interference cylinder on the suppression and control of the horseshoe vortex structure in the corner area was also studied.