不同头型旋成体入水初期流场特性数值分析  

Numerical research on flow field characteristics of axisymmetric bodies with different head shapes during initial water entry

作　　者：吕红庆[1] 许磊 王振清[2] LYU Hongqing;XU Lei;WANG Zhenqing(Yantai Research Institute of Harbin Engineering University,Yantai 264000,China;College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]烟台哈尔滨工程大学研究院,山东烟台264000 [2]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001

出　　处：《兵器装备工程学报》2022年第12期34-42,共9页Journal of Ordnance Equipment Engineering

摘　　要：采用重叠网格技术并引入Schnerr and Sauer空化模型,考虑旋成体入水过程发生空化现象,对不同头型旋成体从低速到高速的入水过程进行了数值模拟。研究表明:采用数值模拟所得到的入水空泡形态演化与速度变化和试验数据吻合良好。不同头型旋成体在相同入水初速下,形成的空泡尺寸与排水速度呈现相反的关系,旋成体入水空泡尺寸越大,则排水速度越小。当旋成体抵达同一入水深度时,平头旋成体空泡尺寸最大,圆头旋成体次之,尖锥头旋成体最小,旋成体的阻力系数不受低速到高速入水过程的影响。随着入水初速度增加旋成体速度衰减率变快,旋成体头部瞬间冲击压力峰值与峰值的幅值宽度随着入水速度增加而增大,相同头型旋成体在150 m/s速度下的冲击压力峰值约为50 m/s速度下的8~10倍,旋成体100 m/s速度下的冲击压力峰值约为50 m/s速度下的3~5倍,瞬间冲击压力峰值变化随着速度变化呈近似平方关系增加。Using the overlapping grid technology and introducing the Schnerr and Sauer cavitation model, this paper carries out a numerical simulation of the water entry process of different head-shaped axisymmetric bodies from a low speed to a high speed, considering the cavitation phenomenon that occurs during the entry process. The research shows that shape evolution of the cavitation during the entry obtained through the numerical simulation is in good agreement with the velocity change of axisymmetric bodies and the test data. At the same initial velocity of water entry, the size of cavitation formed by different head-shaped axisymmetric bodies has an inverse relationship with the drainage velocity. As the size of cavitation grows larger during waterentry, the drainage speed becomes smaller.When axisymmetric bodies reach the same water entry depth, the cavitation size of flat-headed axisymmetric bodies are the largest, followed by round-headed ones, and the tapered-headed ones are the smallest. The drag coefficient of the cross-medium axisymmetric bodies is not affected by the water entry process from a low speed to a high speed. As the initial speed of water entry increases, speed decay rate of axisymmetric bodies becomes faster, and both the peak value of the instantaneous impact pressure on the head of axisymmetric bodies and its peak amplitude width increase. The peak impact pressure of the same head-shaped axisymmetric body at a speed of 150 m/s is about 8~10 times of that at a speed of 50 m/s, and the peak value of the impact pressure of the axisymmetric body at a speed of 100 m/s is about 3~5 times of that at 50 m/s.The change of instantaneous impact pressure peak increases with an increase of speed change, the two showing an approximatesquare relationship.

关 键 词：旋成体头型 入水 数值模拟 空泡演化 冲击载荷 

分 类 号：TJ67[兵器科学与技术—武器系统与运用工程]