纵向静不稳定对飞翼起飞性能的改善研究

Research on Improving Flying Wing Takeoff Performance with Longitudinal Static Instability

按照纵向静不稳定配平原则设计了一个飞翼的总体方案,通过CFD计算得到了相关气动数据。采用数值方法仿真了纵向静不稳定飞翼在两种滑跑抬头状态的起飞离地过程。分析了升降副翼向下偏转时刻对于抬头时间和剩余抬头角速度的影响,给出了迎角、抬头角速度、力矩等参数随时间的变化曲线,最后分析了起飞过程所需要的滑跑距离。研究结果表明,纵向静不稳定飞翼能够达到与常规飞机相同的起飞速度和起飞滑跑距离指标。

The simulations for takeoff using numerical methods were presented, whose object was conceptual scheme of flying wing with longitudinal static instability. The relations between the lifting nose time and surplus pitching angular velocity with the time of elevon downward action were analyzed. The relation curves for angle of attack, the pitching angular velocity and moment were presented. Finally, the running distance for takeoff was analyzed. Thus, the flying wing with longitudinal static instability equals to the conventional aircraft in takeoff speed and running distance.