野战环境下大型飞机超低空气动特性分析

Aerodynamic analysis on fly-at-zero of big airplane in field environment

针对野战环境下的大型飞机超低空飞行,采用CFD方法对地面存在前向或横向不对称障碍物时地面效应对气动参数的影响进行了数值分析,包括纵向稳定性和侧向摇晃等问题。研究结果表明,野战等非常规飞行条件下,地面不确定障碍物会造成大型飞机稳定性变差,严重时可能出现纵向点头和横侧向摇晃现象,容易导致触地危险。最后,从现代飞行控制理论角度提出了对常规布局大型飞机进行闭环控制的研究思路。

According to the flyatzero of big airplane on unconventional condition such as field environ ment, the influences of ground effect on airplane＇ s aerodynamic parameters with forward or asymmetrical lateral obstacles on the ground were presented by CFD approach, including the longitudinal stability and lateral wing rock. The research results show that the uncertain obstacles on the ground will deteriorate the stability of big plane, and then cause the nodding or wing rock, this flight process will induce the air plane to touch the ground. In the end, the article presents the research idea for closed loop control ap proach for large airplane with conventional configuration in terms of modern flight control theory.