摘要
为了探索变后掠翼飞机在不同飞行状态下保持最优飞行性能的问题,采用一种剪切式变后掠翼的变后掠方式,通过改变机翼后掠角但并不改变翼型来实现实时最优飞行。建立了四组不同后掠角的翼身组合体,并对其进行了宽广速域的扰流流场数值模拟,分析其在不同迎角和马赫数下的气动特性,最后得出最优后掠角变化规律。仿真结果表明,剪切式变后掠翼能显著改善飞机升力、阻力和升阻比等气动特性,使可变形飞机能适应多种环境和任务,在全飞行任务周期内相对固定翼飞机具有更优的性能。
In order to investigate the problem of the variable-sweep aircraft flying at different condition to keep the optimal flight performance,a new variable-sweep mode of shearing variable-sweep airfoil was used to realize the optimal flight performance in real time by changing the sweepback of wing,but the airfoil profile won＇t be changed. Four groups of the wing-body combinations with different sweepback angles were established. Numerical simulations were processed on the wide speed domain turbulence flow field,and its aerodynamic characteristics were analyzed at the different Mach number and Angle of attack. At last,the changing rules of sweepback were obtained. Simulation results show that the shearing variablesweep airfoil can significantly improve the aerodynamic characteristics of the aircraft,such as lift,drag and lift-to-drag ratio,etc. This can enable the adaptation of morphing aircraft in multi environments and multi missions,and ultimately lead to better performance for morphing aircraft in comparison with conventional fixed-wing aircraft.
出处
《飞行力学》
CSCD
北大核心
2015年第5期411-414,419,共5页
Flight Dynamics
关键词
最优飞行性能
剪切式变后掠
数值模拟
升阻比
气动特性
optimal flight performance
shearing variable-sweep airfoil
numerical simulation
lift-to-drag ratio
aerodynamic characteristics
