摘要
在VOF(volume of fluid)模型的基础上,引入level set函数,形成CLSVOF(coupled level set volume of fluid)模型对气液两相流的振荡流动和传热过程进行数值模拟,与只采用VOF模型模拟的结果进行对比分析,并与实验结果相比较.结果表明:无论是针对矩形空腔中两相流的振荡流动和传热,还是活塞冷却油腔中机油的振荡冷却过程,采用CLSVOF模型都可以更为准确地模拟气液两相流的振荡流动规律,传热系数计算值也与实验结果保持了更高的一致性.对于活塞冷却油腔中机油的振荡冷却计算,随着转速即雷诺数的增大,传热系数计算值的误差开始增大.在极限转速3 000r/min时,CLSVOF模型的误差为3.8%,VOF模型的误差为7.5%,CLSVOF模型的误差增幅稳定在0.6%左右.CLSVOF模型的误差较小且误差增幅稳定,说明其计算准确性更高.
On the basis of VOF （volume of fluid） model, the level set function was in- troduced, and the CLSVOF （coupled level set volume of fluid） model was formed to numeri- cally simulate the process of gas-liquid two-phase oscillating flow and heat transfer. The simulation results of CLSVOF model were compared with that of VOF model, and also com- pared with the experimental results. The results show that either for the oscillating flow and heat transfer process of two-phase flow in rectangular cavity, or for the oscillating cooling process of engine-oil in piston oil cooling gallery, CLSVOF model can more accurately simu- late the oscillating flow rules of gas-liquid two-phase flow, and the calculation values of heat transfer coefficient consist with experimental results much better. For the oscillating cooling calculation of engine-oil in piston oil cooling gallery, with the increase of speed, i.e. Reyn- olds number, the error of calculation values of heat transfer coefficient increase accordingly. At the ultimate speed of 3000r/min, the error of CLSVOF model is 3.8%, and the error of VOF model is 7.5% ; the error increase amplification of CLSVOF model is about 0.6%. The error increase amplification of CLSVOF model is relatively small and stable, so its higher calculation accuracy can be illustrated.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2015年第5期1040-1046,共7页
Journal of Aerospace Power
基金
国家重点基础研究发展计划(613570303)
关键词
两相流
振荡流动
界面追踪
CLSVOF模型
传热
two-phase flow oscillating flow
interface trackingcoupled level set volume of fluid model
heat transfer
