考虑热力学效应的高温水空化模拟  

Cavitating flow simulation for high temperature water based on thermodynamic effects

作　　者：季斌[1] 罗先武[1] 吴玉林[1] 张瑶[1] 许洪元[1] 

机构地区：[1]清华大学热能工程系,水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第2期262-265,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50676044);北京市自然科学基金资助项目(3072008)

摘　　要：在汽液质量传输方程的基础上,考虑局部汽/液相含量、局部压力与饱和蒸汽压之差及空化的热力学效应,提出了一种可应用于高温水空化流计算的空化模型。为了评价该模型的适用性,以NACA66(MOD)翼型为对象,采用局部均匀平衡流方法分别计算了水温为293 K和373 K时的物面负压系数,并与实验和Singhal的全空化模型的计算结果进行了比较。研究表明:在水温为293 K时,改进的空化模型与全空化模型的计算结果均与试验吻合较好;在水温为373 K时,虽然两种空化模型的结果均显示空化的发展受到了抑制,但该文提出的空化模型能明显地反映出翼型表面空泡区的温度变化(即热力学效应)。该文提出的空化模型更适合模拟高温水的空化流。The vapor-liquid mass transport equation was used to formulate a cavitation model suitable for cavitating flow simulations of high temperature water. The model includes thermodynamic effects, such as the vapor/liquid ratio and the difference between the local static pressure and the saturated vapor pressure. The accuracy of the model was evaluated for cavitating flow around a NACA66（MOD） airfoil at 293 K and 373 K, using the locally homogeneous flow method, with comparison to the experimental data and calculated results of Singbal＇s full cavitation model. The results indicate that at 293 K, both the model and the full cavitation model agree well with the experimental results. At 373 K, both models predict that cavitation is reduced with the current model able to predict the temperature variations in the cavity zone near the foil wall surface, i. e. , the thermodynamic effect. The model presented in this paper more effectively models cavitating flow at high temperature water

关 键 词：工程热力学 空化模型 高温水 空化流 

分 类 号：TK123[动力工程及工程热物理—工程热物理]