翼尖形状对双后掠飞翼纵向气动特性的影响

A Longitudinal Aerodynamic Influence of Wingtip Shape on Double Swept Flying Wing

以双后掠飞翼为基础外形,兼顾隐身性能,对其翼尖进行改形设计。利用数值模拟方法研究翼尖平面形状对双后掠飞翼布局纵向气动特性和纵向静稳定性的影响。结果表明:剪切翼尖可以提供向前的推力、减小飞翼的阻力,提高最大升阻比,增强纵向静稳定性。不同形状的剪切翼尖影响效果不同,巡航状态下,相比于基础构型,剪切翼尖最大可以使双后掠飞翼阻力减少7.9%,最大升阻比提高11.9%,纵向静稳定裕度增加10.8%。研究结果对双后掠飞翼布局翼尖形状的选取有一定的参考意义。

Taking the double swept flying wing as a base outline in consideration of stealth performance,a wingtip is reshaped.The numerical simulation method is utilized for studying the influence of wingtip shape on the longitudinal aerodynamic characteristics and longitudinal stability of double swept flying wing.The result shows that for the double swept flying wing,the sheared wingtip can provide forward thrust,reduce the drag,increase the maximum lift-to-drag ratio,and enhance the longitudinal static stability.Different shapes of sheared wingtip have different effects.Under condition of flying at a cruising speed,compared with the basic wingtip,the best sheared wingtip can reduce the drag by 7.9%,increase the maximum lift-to-drag ratio by 11.9%and increase the static stability margin by 10.8%.The results of the article can provide certain references for the selection of the wingtip shape of the double swept flying wing.