摘要
为了消弱叶片根部马蹄涡的强度,提出一种无需额外消耗能量的被动控制手段,在简化了的叶片-平板结构的上游某位置布置一组粗糙元。利用fluent软件采用k-ωSST湍流模型和SIMPLE算法,数值模拟了不同摆放位置及高度的粗糙元对叶片根部马蹄涡的影响。结果显示任何一种粗糙元都能不同程度地削弱马蹄涡系,放置在距离叶片根部d/T=1(d为粗糙元距叶片前缘距离,T为翼型最大厚度)处且高度h/T=1/20(h为粗糙元的高度)的粗糙元,在粗糙元后的流动结构与流向涡的空间尺度以及主马蹄涡涡量的综合控制效果较好;另外,相对较高的粗糙元对主马蹄涡控制效果来说是有利的,但会使叶身两侧的流向马蹄涡涡腿远离叶身。
In order to weaken the horseshoe vortex, the roughness elements are placed upstream of the blade on the flat plate. A kind of passive control method is proposed. With the help of computational fluid dy- namics software Fluent, this paper carries out a study on effects of roughness elements＇ heights and positions on the turbulent junction flow. The results show that any roughness elements can weaken the horseshoe vor- tex. The case is proposed with d/T = 1, h/T = 1/20 （ d is distance between roughness elements and the leading edge of the blade, T is maximum thickness of the blade, h is height of the elements）, which colli- gates spatial scale of elements＇ wake, horseshoe vortex＇s stream-wise votex＇s scale and primary horseshoe vortex＇s vorticity. Furthermore, the increasing heights of the roughness elements are beneficial to weaken the main horseshoe vortex, but the vortex legs will be far away from the blade.
出处
《沈阳航空航天大学学报》
2013年第1期1-4,25,共5页
Journal of Shenyang Aerospace University
基金
航空科学基金(项目编号:2011ZA54002)
关键词
马蹄涡
角区流动
粗糙元
流动控制
horseshoe vortex
junction flow
roughness elements
flow control
