层板结构内部流场数值模拟研究

Numerical Simulation of the Internal Flow in Lamilloy

在已经研究的层板换热特性的基础上,通过对层板结构内部流场的数值模拟研究,有助于理解层板内部复杂流动的情况,从而揭示层板内部换热强弱的机理。根据B、C两种类型结构的层板研究表明:在扰流柱柱面附近区域速度最大,这有利于热交换;扰流柱柱高的改变对流场影响较大,而且对换热也带来明显的影响。将数值模拟结果与实验进行对比发现,数值模拟换热系数的分布规律基本与实验相一致,误差也在可接受的范围内。

The numerical simulations are carried out for good understanding of the mechanism of internal flow and heat transfer in lamilloy. The results show that the velocity around the pin-fin is the highest and the heat transfer of this area is stronger. The variation of the height of the channel has effects on the fluid flow, and leads to different heat transfer coefficient distribution. The results obtained by the calculations agree well with the measurements.