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采用数值模拟的方法研究了不同后掠角三角翼的静态地面效应,通过对气动力和流场特性的分析发现,随着后掠角的减小,地面对迎风面下流动的阻滞作用增强,地效导致的迎风面气动力增量也随之增大。地效导致的背风面气动力增量同样随着后掠角的减小而增大,但在不同的后掠角范围内,地效诱导背风面气动力增量的机理不同:中大后掠角下,其主要通过增强前缘涡强度诱导更大的吸力,而小后掠角下,其主要通过促进前缘涡向内扩散增大吸力范围。
The static ground effect of the delta wing with different sweep angles is studied by numerical simulation. By analyzing the aerodynamic force and flow field characteristics, it is found that with the reduction of the sweep angle, the ground surface blocks the flow under the windward surface Enhancement, land-based windward side caused by the increase of aerodynamic force also will increase. The aerodynamic increase of leeward surface due to land use also increases with the decrease of sweep angle, but the mechanism of aerodynamic increase of leeward surface induced by geo-efficiency is different at different sweep angles: In the lower corner, it mainly induces more suction by enhancing the vortex strength of the leading edge, while at a small sweep angle, it mainly increases the suction range by promoting inward vortex diffusion of the leading edge.