三角柱体对机翼根部马蹄涡的影响

摘要

Based on the early paper,effects of cylinder’ s width ratio on the turbulent junction flow were dis-cussed. 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 in-tensity) . 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.%在早期文献的基础上,采用k–ωSST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地提高。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。此种三角柱既能实现控制马蹄涡,又不会引起流场的整体剧烈变化。