圆盘水漂运动特性数值模拟研究

Study on Numerical Simulation of Skipping Stone Movement Characteristics

为研究近水面的起飞再入式运动对飞行器近海面的高机动突防能力的影响,文中基于CFD数值模拟方法,湍流模型选取SST k-ω模型,利用重叠网格技术,将N~S方程与六自由度弹道方程耦合对三维空间内薄圆盘的水漂运动进行了数值模拟,研究了不同工况下水漂的入水特性和运动规律.结果表明:数值模拟计算得到的圆盘从接触水面到离开水面的时间与实验值吻合较好,圆盘的运动轨迹与实验结果相吻合;圆盘在打水漂向前运动的同时由于自身的旋转产生了马格努斯效应,从而使圆盘的运动轨迹产生了一定的侧向偏移以及圆盘自身的姿态发生了侧向偏转.

Skipping stone is a common solid water bounce movement.Studying its take-off and reentry movement near the water surface has a strong reference significance for the development of the aircraft's high maneuverability penetration ability in the offshore surface.Based on the CFD numerical simulation method,taking the SST k-ωmodel as the turbulence model,using the overlapping grid technology to couple the N~S equation and the six-degree-of-freedom ballistic equation,a numerical simulation was carried out for the skipping stone of a thin disk in three-dimensional space.The characteristics and movement laws of skipping stone under different working conditions were studied.The results show that the time between the disc contacting the water surface and leaving the water surface calculated by the numerical simulation is in good agreement with the experimental value,and the disc's motion trajectory is consistent with the experimental results.Due to the disc moving forward and also rotating at the same time,a Magnus effect takes place,causing a lateral offset in the trajectory of the disc and a lateral deflection of the posture of the disc itself.