飞机亚跨声速飞行操纵特性分析

Analysis of aircraft subsonic and transonic flight control characteristics

针对中等展弦比、中等后掠角机翼布局的超声速飞机在亚跨声速飞行时遇到的操纵特性异常现象,通过估算飞机在海拔5 km高空的气动特性,获得了飞机的纵向平衡性能和静操纵性的变化规律。通过数值计算,得到了飞机在低空跨声速飞行时的操纵特性;分析了造成飞机在某些飞行速度下操纵跟随性较差、大速度飞行时俯仰操纵过于灵敏、不同速度下杆力变化大等现象的原因。针对亚跨声速区的飞行与操纵特点,给出了飞行操纵建议,以提高飞行安全。

For the abnormal control characteristics of the supersonic aircraft which has a middle swept wing with middle aspect ratio in transonic flight,the aerodynamic characteristics of the aircraft at 5 km flight altitude were calculated. And then the longitudinal trimming and static control performance of the aircraft with respect to flight velocity were estimated. With the results of computation,the control characteristics can be observed corresponding to transonic flight at a low altitude. Some fly quality disadvantageous to fight safety are demonstrated such as inferior response to pilot,oversensitive longitudinal control and large stick force variation with flight speed. This paper provides a precise analysis method and a technical support to improve the flight safety and guide the flight operations.