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结合民机客舱结构设计参数和飞机总体设计参数要求进行气动布局设计,获得250座级翼身融合(BWB)布局客机初步气动设计方案。采用数值求解N-S方程的方法获得该布局在巡航和起飞条件下的纵向气动特性。结果表明,在巡航条件下α=2°时最大升阻比Kmax可达15.9。以固定巡航飞行升力系数下最小化飞行阻力作为目标优化了机翼展向几何扭转角分布。结果表明,优化后外侧机翼的负载减轻,减小了激波强度和波阻,从而提高了巡航升阻比Kcruise。Kmax由初始布局的15.9提高到20.7,Kcruise由初始布局的15.4提高到19.2,与现役同座级客机接近。优化后起飞特性得到改善,巡航平飞时低头力矩减小,Cm0为更接近零的一小负数,利于操纵。
Combined with the structural design parameters of civil aircraft cabin and the requirements of the overall design parameters of the aircraft, the aerodynamic layout design was adopted and the preliminary aerodynamic design scheme of 250-seat BWB layout passenger aircraft was obtained. Longitudinal aerodynamic characteristics of this layout under cruising and take-off conditions were obtained by numerical solution of the N-S equation. The results show that the maximum lift-drag ratio Kmax can reach 15.9 at α = 2 ° under cruising conditions. The aim of this paper is to optimize the geometrical twist angle distribution of the wings with the objective of minimizing the flight resistance under the lift coefficient of fixed cruise flight. The results show that the optimization of the outer side of the wing to reduce the load, reducing the shock strength and wave resistance, thereby increasing the cruise lift to drag ratio Kcruise. Kmax from the initial layout of 15.9 to 20.7, Kcruise from the initial layout of 15.4 to 19.2, and the current seat of the same class passenger close. The optimized take-off characteristic is improved, the bowing moment is reduced when the cruise is leveled, and Cm0 is a small negative number closer to zero, which is conducive to maneuvering.