头型对回转体垂直入水时空泡面闭合影响的数值模拟  

Numerical simulation of the effect of different head form on surface closure of water entry supercavity

作　　者：温俊生 施红辉[1] 徐胜利[2] 彭杰[2] 陈波[1] WEN Junsheng;SHI Honghui;XU Shenggi;PENG Jie;CHEN Bo(Faculty of Mechanical Engineering ＆.Automation,Zhejiang Sci Tech University,Hangzhou 310018,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018 [2]清华大学航空航天学院,北京100084

出　　处：《浙江理工大学学报（自然科学版）》2018年第5期573-579,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省自然科学基金项目(LY16A020003);"十三五"海军装备预研项目(30208)

摘　　要：为了获得头型对入水空泡面闭合时间的影响以及某实际射弹模型入水过程中发展的空泡尺寸,通过VOF(Volume of fluid)方法和二维轴对称模型,在Fluent 15.0中嵌入用户自定义函数并应用动网格技术,对不同头型圆柱体和实际射弹模型以500.00m/s的速度匀速入水时产生的入水空泡进行了数值模拟。结果表明:圆头型圆柱体入水空泡发生面闭合的时间最早,其次是圆锥型圆柱体,平头型圆柱体入水空泡发生面闭合时间最晚;圆头型圆柱体诱导的气相速度最大,其次是圆锥型圆柱体,平头型圆柱体诱导的气相速度最小。模拟结果与文献结果一致性很好。实际射弹模型入水后,其空泡由前后两部分复合而成,数值结果和Logvinovich半经验公式的计算结果具有很好的一致性。该研究结果可以为高速物体入水超空泡的流动特性分析提供参考。In order to obtain the effects of head form on surface closure time and the supercavity size which forms and develops in the water entry process of projectile model, Based on VOF （Volume of fluid） method and two dimensional axisymmetric model, user defined function was embedded in Fluent 15.0 and dynamic mesh technology was used to conduct numerical simulation of water entry supercavity generated by the cylinders with different head forms and the uniform velocity of 500.00 m/s of a practical projectile model. The results showed that the surface closure time of the cylinder with round head form was the earliest, followed by the cylinder with the conical head form, and the cylinder with the closely cropped head form was the latest one. The cylinder with round head form induced the largest gas phase velocity, followed by the cylinder with the conical head form, and the cylinder with the flat head form had the smallest effect. The results agree with the literature very well. After the projectile model entered the water, the supercavity consisted of two parts. The results have a good agreement with the calculation result of Logvinovich semi empirical formula. It can provide the reference for the study of the supercavity flow characteristics induced by the water entry of high speed objects.

关 键 词：超空泡 头型 实际射弹模型 面闭合 速度场 数值模拟 

分 类 号：O352[理学—流体力学] O359[理学—力学]