大尺度跨介质航行器高速倾斜入水冲击载荷特性研究

Impact Load Characteristics of Large-Scale Trans-Medium Vehicles during High-Speed Oblique Water Entry

为了研究大尺度跨介质航行器高速倾斜入水冲击载荷特性,基于流体体积多相流模型耦合S-DOF刚体运动模型构建了跨介质航行器高速倾斜入水三维非定常数值计算模型,采用细长体高速入水自由运动试验数据对数值计算模型的计算精度进行了校核及验证,对比研究了平头、锥头头型高速倾斜入水的冲击载荷特性。结果表明:锥头头型入水的最大轴向、纵向冲击载荷发生的时间几乎同步,而平头头型最大轴向冲击载荷相比纵向载荷发生的时间显著延迟;对于最大冲击载荷,平头头型的轴向冲击载荷大于其纵向冲击载荷,而锥头头型的轴向、纵向冲击载荷几乎相同;相较于平头头型,锥头头型的轴向冲击载荷显著降低,45°入水时,其最大峰值约为平头头型的1/3。

To investigate the impact load characteristics of large-scale trans-medium vehicles during high-speed oblique water entry,a three-dimensional unsteady numerical calculation model of high-speed oblique water entry of the trans-medium vehicles was established based on the volume of fluid(VOF)multiphase flow model and the S-DOF rigid body motion mode.The calculation accuracy of the numerical calculation model was checked and verified by using the free motion test data of the slender objects during high-speed water entry,and the impact load characteristics of the vehicles with flat heads and conical heads during high-speed oblique water entry were compared.The results show that the occurrence time of the maximum axial and longitudinal impact loads of the vehicle with a conical head is almost synchronous,while the maximum axial impact load of the vehicle with a flat head is significantly delayed compared with the longitudinal load.For the maximum impact load,the axial impact load of the vehicle with a flat head is greater than its longitudinal impact load,while the axial and longitudinal impact loads of the vehicle with a conical head are almost the same.Compared to that of the vehicle with a flat head,the axial impact load of the vehicle with a conical head is significantly reduced,and the maximum peak value is about 1/3 of that of the vehicle with a flat head when the water entry angle is 45°.