三角柱体对机翼根部马蹄涡的影响

Effect of Triangular Cylinder Application on the Wing-body Junction Flow

摘要:

在现有文献的基础上,采用k-棕SST 湍流模型和SIMPLE 数值模拟算法,进一步探讨增加宽度比的三角柱体对于角区马蹄涡的影响。结果显示当三角柱体宽度在一定范围内增加时,马蹄涡的控制效果得到进一步提高。定义的涡强系数(基于涡心位置及马蹄涡的涡量)能很好地表征马蹄涡的强度。当三角柱体宽度与机翼厚度相同时,即宽度比为b/T =1(b为三角形宽度,T为机翼最大厚度)时涡强系数降到原来的27%。文中的三角柱体的高度仅为机翼厚度的1/20,和当地边界层的厚度相当。此种三角柱既能控制马蹄涡,又不会引起流场的整体剧烈变化。

关键词:角区流动;马蹄涡;三角柱体;流动控制;涡强系数

Abstract:

Based on the early paper,effects of cylinder's width ratio on the turbulent junction flow were discussed. The result indicates the triangular cylinder can control horseshoe vortices better with suitable increasing width ratio. A new vortex strength coefficient is defined (it is based on the position of vortex core and the vortex intensity). When width of triangular cylinder and thickness of wing are equal, the vortex strength coefficient is 27% of the baseline. Height of the triangular cylinder is only 1/ 20 of wing thickness and approaches the thickness of boundary layer. The triangular cylinder can control horseshoe vortices effectively, and will not cause serious change of whole flow field.

Key words:junction flow; horseshoe vortex; triangular cylinder; flow control; vortex strength coefficient