地面效应对超低空空投载机动力学特性的影响  

Influence of ground effect on aircraft dynamic characteristics during ultra-low altitude airdrop

作　　者：刘日[1] 孙秀霞[1] 董文瀚[1] 李大东[1] 徐光智[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《飞行力学》2014年第4期289-293,共5页Flight Dynamics

基　　金：国家自然科学基金资助(60904038);航空科学基金资助(20121396008)

摘　　要：分析了地面效应影响下空投载机纵向气动特性的变化机理,研究了地面效应对载机静、动稳定性的影响。基于Routh-Hurwitz稳定性判据,推导了载机超低空飞行保证纵向动稳定性的气动导数范围。研究结果表明,在地面效应影响下,随着高度降低,载机升力系数增大,俯仰静稳定性增强,高度静稳定性减弱;地面效应将引起载机升降舵效能降低,同时使配平迎角减小,使空投过程中载机俯仰角、迎角响应峰值增大。The aerodynamic principle of aircraft in ground effect is analyzed. And the influence of ground effect on aircraft static and dynamic stability is presented. The aerodynamic derivative scope to guarantee longitudinal stability is deduced based on Routh-Hurwitz criteria. Researches show that the lift coefficient increases,the static pitch stability is enhanced and the static height stability is reduced with the decrease of height. Under the influence of ground effect,the elevator rudder effectiveness as well as the trim angle of attack can be decreased,and the pitch as well as the attack angle response peak can be enhanced.

关 键 词：超低空 重装空投 地面效应 气动特性 

分 类 号：V212.1[航空宇航科学与技术—航空宇航推进理论与工程]