翼身融合（BWB）布局是未来民航客机的重要布局形式之一。采用数值模拟方法研究固定下滑角条件下初始迫降速度和俯仰角对BWB飞机水上迫降过程中运动特性的影响规律。采用有限体积法数值求解非定常RANS方程，流体体积分数法捕捉水气交界面，刚体六自由度模型实现飞机受力与运动的耦合，整体动网格方法实现飞机与水面的相对运动。在初始迫降水平速度-俯仰角相平面内，BWB飞机在水上迫降过程中存在稳定运动、海豚运动和跳跃运动3种形式。随着初始迫降速度或俯仰角的增加，飞机逐渐由稳定运动过渡到海豚运动，最终到跳跃运动。当初始迫降水平速度增加时，冲击形成的正压区和浸没滑行形成的负压区的压力绝对值和范围增加，当正、负压区分别位于重心前后时，两者共同导致抬头力矩峰值；当初始迫降垂向速度增加时，飞机入水后回弹到较高的位置；当初始迫降俯仰角增加时，飞机初始重心位置升高，同时迫降初期浸润面积增加变缓，两者共同导致飞机入水深度增加，水线前移。

Blended Wing Body （BWB） layout is one of the important layouts for future civil aircraft. The influence of initial speed and pitch angle on the motion characteristics of BWB aircraft during ditching at a fixed glide angle is studied by numerical simulation. The finite volume method is used to solve the unsteady RANS equations， the volume of fluid method is used to capture the water-air interface， the rigid body six-degree-of-freedom model is adopted to couple the force and motion of the aircraft， and the global moving mesh method is applied to realize the relative motion between the aircraft and the water surface. In the phase plane of the initial ditching horizontal speed and pitch angle， three forms of motion for BWB aircraft are observed during the process of ditching： stable motion， porpoising motion， and skipping motion. With the increase of initial ditching speed or pitch angle， the aircraft gradually transitions from stable motion to porpoising motion and finally to skipping motion. When the initial ditching horizontal speed increases， the absolute value and range of the pressure in the positive pressure zone formed by the impact and the negative pressure zone formed by the hydroplaning increase. When the positive and negative pressure zones are located before and after the center of gravity， respectively， they jointly lead to a pitch-up moment peak. When the initial ditching vertical speed increases， the aircraft rebounds to a higher position after water entry. When the initial ditching pitch angle increases， the initial center of gravity position rises， and the growth of wetted area at the initial stage in ditching slows down， both jointly leading to an increase in water entry depth and a forward movement of the waterline.