质量传输模型在考虑热力学效应空化流动计算中的应用评价  

Evaluation of the mass transport models in computations of cavitating flows with thermal effects

作　　者：时素果[1] 王国玉[1] 陈广豪[1] 

机构地区：[1]北京理工大学,北京100081

出　　处：《应用力学学报》2011年第6期589-594,672,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50979004);高校博士点基金(200800070027)

摘　　要：通过二次开发技术,将Merkle、Kunz、Kubota、Singhal四种不同的质量传输模型和液氮物质属性随温度变化函数等引入了计算软件CFX。在考虑热力学效应的条件下,对绕翼型的液氮空化流动进行了数值计算,并与实验结果进行对比分析。结果表明:由于传输方程的物理机制不同,造成各模型的计算结果尤其是对热力学效应影响的描述存在明显的差别。Merkle模型计算得到的压力和温度分布与实验最为接近,质量传输过程能较好地反映温度场变化的影响,从而能较好地反映热力学效应对空化发展的影响;Singhal模型计算得到的结果与实验数据差距最大,其模拟得到的质量传输过程不能很好地反应温度流场的变化的影响。The numerical simulation on liquid nitrogen cavitating flows around a 2D quarter caliber hydrofoil with thermal effect is conducted.In the simulation,four different Merkle,Kunz,Kubota and Singhal mass transport models and variable thermodynamic properties of the fluid are implemented to commercial software CFX via a UDF(user defined function) which is compiled and linked to the solver.Numerical results obtained are compared with the experimental ones.It is revealed that the numerical results,especially the influence of the thermal effect,have some distinctive because of different physical mechanism of the four mass transport models.The pressure and temperature distributions obtained based on Merkle cavitation model are the nearest results compared with the experimental data.The process of mass transport can reflect the influence of temperature variation well.The distinctions between the numerical and experimental results are different obviously when the Singhal cavitaion model is used,and the model can not describe the temperature distribution very well.

关 键 词：热力学效应 质量传输 液氮 数值模拟 

分 类 号：TV131.32[水利工程—水力学及河流动力学]