飞翼布局飞行器可伸缩腹部襟翼气动分析

研究可伸缩腹部襟翼对飞翼布局飞行器的增升作用，可以分析其对飞行器气动力的影响规律。本文以某飞翼布局飞行器为初始外形，利用数值模拟方法针对可伸缩腹部襟翼伸展时的缝隙分布进行选型；在此基础上，分析腹部襟翼不同收起状态的全机气动力特性。结果表明：可伸缩腹部襟翼完全伸展时，山字形舵片之间的缝隙能够有效减轻其后方的气流分离，增强增升效果，并且当缝隙宽度和山字形舵片宽度一致时，增升效果最好；在可伸缩腹部襟翼收起过程中，俯仰力矩系数随腹部襟翼高度改变呈现准线性变化，并且可伸缩腹部襟翼的增升效果好于相同高度的无缝隙腹部

Aerodynamic Analysis of Retractable Belly Flap for a Flying-wing Vehicle

In order to study the lift enhancement effect of the retractable belly flap on the flying wing configuration, a flying wing configuration model was taken as the initial shape of flying wing configuration aircraft, the distribution of crevices on the retractable belly flap are studied by the method of numerical simulation, and the variation of aerodynamic forces under different retracted states of the belly flap is obtained. Results show that, the retractable belly flap, when it is fully extended, can effectively lighten the air separation behind it and enhance the lift. When the crevice width is the same as the width of the hill shaped rudder, the effect of lift r enhancement is the best. The pitching moment shows a quasi-linear growth with the decrease of the height of the retractable belly flap during the belly flap retraction process. Moreover, the lift enhancement effect of the retractable belly flap is better than that of the seamless belly flap at the same height.