摘要
为研究物体在近自由面的运动规律,采用Fluent软件,选择VOF多相流模型和标准k-ε湍流模型,针对物体在26、106、206、406mm四个不同水深下分别以60、100、200m/s的初速度运动的超空泡流场进行数值模拟,研究水深对空泡形态的影响,计算出在自由液面上出现的先导波浪。结果表明:随着水深的增加,空泡的对称性越来越好,自由面上的波浪高度逐渐减小,空泡长度和空泡直径的变化与Logvinovich空泡截面独立原理所导出的半经验公式拟合曲线更加吻合;随着物体速度的增加,自由面上的波浪高度也在增加。文中分析了先导波的起始距离以及水深对它的影响,可为高速射弹超空泡的形态特性和流体动力学特性研究提供参考。
To study the motion law of the object near the free surface,Fluent software was applied,and VOF multiphase flow model and standard k-εturbulence model were chosen to carry out numerical simulation of supercavity flow field of the object which moved at the first velocity of 60,100 m/s and 200 m/s under four different water depths(26,106,206 mm and 406 mm)to study the influence of water depth on cavitation morphology.Meanwhile,the Pilot wave was calculated on the free surface.Numerical simulation results show that:as water depth increases,the symmetry of cavitation is getting better and better;the wave height on the free surface decreases gradually;the changes of cavitation length and cavitation diameter are consistent with the semi-empirical formula proposed by Logvinovich and Savchenko.In addition,as the object velocity increases,the wave height on the free surface also increases.This paper analyzes the initial distance of the pilot wave and the influence of water depth on it.It can provide the basis and reference for the study of the morphological properties and hydrodynamic characteristics of high velocity projectile supercavity.
作者
张亚涛
施红辉
卫康云
ZHANG Yatao;SHI Honghui;WEI Kangyun(Faculty of Mechanical Engineering&Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2018年第3期304-311,共8页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
浙江省自然科学基金重点项目(LY16A020003)
"十三五"海军装备预研项目(30208)
关键词
空泡形态
先导波浪
自由面
波浪高度
cavitation morphology
pilot wave
free surface
wave height
