串列翼飞行器机翼耦合特性研究

串列翼飞行器由于其前后翼以及机身之间的相互干扰,气动特性复杂且难以预测。针对一款串列翼飞行器,以前后翼之间的垂直距离为变量,设计了五种气动布局,并使用CFD方法进行了数值模拟计算。通过对五种布局升阻特性与俯仰特性的比较及分析,发现前后翼垂直方向距离会显著影响整机升阻比、俯仰稳定性、气动中心位置以及压力中心位置。两翼间垂直方向上的距离越大,飞行器升阻比越高,且气动中心更加靠后。而在两翼间距离相同的情况下,前翼在下的布局拥有更高的升阻比,而前翼在上的布局拥有更好的俯仰静稳定性。

Study of wing coupling characteristics of a tandem wing aircraft

The aerodynamic characteristics of a tandem wing aircraft are complex and difficult to predict due to the interaction between front and rear wings and fuselage. In this paper, five aerodynamic configurations were designed for a tandem wing aircraft with the vertical distance between the front and rear wings as a variable, and the CFD method was used for numerical simulation. Results of computation show that the values of gap have significant effects on aerodynamic characteristics, including location of pressure center/ aerodynamic center, longitudinal stability and lift-drag ratio. Increment of gap causes rise of lift-drag ratio and rearward movement of aerodynamic center. At same gap, low fore wing configuration shows higher lift-drag ratio, and high fore wing configuration appears to be more stable in longitudinal direction.