变后掠翼身组合体阻力特性分析

Analysis for drag characteristic of variable swept wing-body

自适应弹性变后掠翼技术可以较好地解决传统变后掠翼重量大、结构复杂的问题,而阻力特性分析是该技术的基础。建立了5个不同后掠角的翼身组合体模型,经过fluent计算,分析了迎角、马赫数、后掠角对翼身组合体阻力的影响,验证了空气动力驱动变后掠的可行性。结果表明,在亚声速范围,阻力的变化趋势与最佳后掠角所需驱动力基本一致;激波产生后,阻力的变化趋势大于最佳后掠角所需驱动力。合理设计弹性驱动机构,可以实现利用飞行阻力驱动机翼变后掠的目标。

Adaptive elastic variable swept wing technology can solve the problem of large weight,complex structure existed in traditional variable swept wing,and this technology is based on the drag analysis.This paper firstly builds five wing-body models under different sweep angles,through the calculation by fluent,the impact on wing-body drag from angle of attack,mach number and wing sweep is analyzed,and verifies feasibility of aerodynamic driven variable swept wing. The results show that,drag trendency and the driving force required by the optimum swept wing are basically the same in the subsonic range.With shockwave generated,the drag tendency is greater than the driving force required by the optimum swept wing. Rational designed flexible driving mechanism can achieve the goal of using the flying drag to make the wing a variable swept one.