摘要
基于多相流模型和运动框架模型构建可压缩超空化流场的数值计算模型,分别使用具有不同物性的流体介质模拟水下跨声速超空化流动,并将数值模拟结果与经验公式结果相互参验,通过对比分析研究在液体可压缩性对跨声速超空化流动的影响.研究结果显示:液体可压缩性对流动参数的分布规律、空化物体的阻力特性和流场的空化情况均有显著影响;考虑液体可压缩性,随飞行速度的增大,射弹的阻力系数将增加,并且在高速工况下超空泡的尺度大幅度减小;可压缩超空化流场中,较300m/s工况,速度为1 900m/s时弹体阻力系数增大约22%,弹尾截面空泡直径减小约30%.
The numerical model of a compressible and supercavitating flow field was established based on the VOF multiphase model,the Schnerr and Sauer cavitation model,the Realizable k-e turbulence model,the Tait liquid state equation,and the moving frame model.Then,transonic and supercavitating flows were simulated by using liquid with different properties.In addition,the results of numerical simulations were verified by using empirical formulas,and the influence of liquid＇s compressibility on the supercavitation flow was studied by comparison and analysis.The simulation results indicate that the compressibility of liquid has significant influences on the distribution of flow parameters,hydrodynamic characteristics of projectiles and cavitation characteristics of flow field.Considering the compressibility of liquid,along with the increase of speed,projectiles＇ resistance coefficient increases and the dimension of supercavities reduces at high speed conditions.In the compressible and supercavitating flow field,compared under the 300m/s work condition,projectiles＇ resistance coefficient increases by 22% and cavities＇ diameter at tail section reduces by 30% under the 1 900m/s work condition.This paper is helpful for the optimal design of projectiles layout and the forecast of trajectories.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2016年第8期1241-1245,共5页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金项目(51409215
51579209)资助
关键词
液体可压缩性
运动框架模型
可压缩超空化流动
数值模拟
compressibility of liquid
moving frame model
compressible and supercavitating flow
numerical simulation
