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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。
Aiming at the low altitude flight of large aircraft under field conditions, the CFD method is used to analyze the influence of the ground effect on the aerodynamic parameters when there is a forward or lateral asymmetric obstacle on the ground, including longitudinal stability and lateral shaking. The results show that uncertainties on the ground can cause the stability of large aircraft to deteriorate under non-conventional flight conditions such as field operations. In severe cases, longitudinal nodding and lateral lateral shaking may occur, which may easily lead to the danger of touchdown. Finally, from the point of view of modern flight control theory, a research idea of closed-loop control of a conventional large aircraft is proposed.