液氮绕水翼低温空化三维数值模拟计算(英文)  

Three-dimensional Numerical Simulation of Cryogenic Cavitating Flows of Liquid Nitrogen Around Hydrofoil

作　　者：孙铁志[1] 魏英杰[1] 王聪[1] 赵成功[1] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《船舶力学》2014年第12期1434-1443,共10页Journal of Ship Mechanics

基　　金：Supported by the Special Fund Project for Technology Innovation Talent of Harbin(Grant No.2013RFLXJ007);The Fundamental Research Funds for the Central Universitie(Grant No.HIT.NSRIF.201159)~~

摘　　要：为探究液氮空化特性,建立有效预测低温流体空化流动数值计算方法,通过CEL语言将空化模型和液氮随温度变化的物理属性引入到CFX求解代码中,开展了液氮绕水翼空化流动的三维数值模拟研究,研究了低温环境下空化流动特性,并对建立的数值方法和空化模型中蒸发系数和凝结系数的适用性进行了评价。结果表明:低温流体在空化过程中表现出的热力学效应对水翼表面的压力和温度分布有明显影响,二者曲线都呈梯度变化;修正系数的数值计算结果与试验数据更接近;考虑汽化潜热影响、修正系数的空化模型对低温流体空化具有较强的适用性。This paper aims to analyze the cavitating flow characteristics of liquid nitrogen and develop an effective computational strategy to simulate cryogenic cavitation relevant to liquid rocket propulsion applications. The aims are realized by implanting the cavitation model and physical properties of liquid nitrogen at different temperatures to the CFX solver code through the CEL（CFX Expression Language）, and considering the effect of latent heat of evaporation in the energy equation.The numerical simulation are then conducted around a 3D hydrofoil, and based on a wide range of comparisons of numerical results and experimental data under cryogenic conditions, the application numerical method and modified cavitation model coefficients are assessed effectively. The results show that the thermodynamic has significantly effect on the pressure and temperature distribution around the hydrofoil, the predicted pressure and temperature inside the cavity are steeper under the cryogenic conditions than those under the isothermal conditions. The computational predictions with the modified evaporation and condensation parameters display relatively better results compared with the cryogenic experimental data than the default parameters. The modified cavitation model which takes into account the thermodynamic effects with the recommend coeffcients is applicable for cavitating flow prediction in cryogenics fluids.

关 键 词：水翼 热力学效应 液氮 空化流动 

分 类 号：O359[理学—流体力学]