装有多孔介质的封闭腔体中热驱动换热的数值研究

Numerical Simulation on Thermally Driven Heat Transfer in Enclosure Filled with Porous Medium

以涡轮叶片超级冷却技术为研究背景,用数值计算的方法,模拟了离心力场下装有多孔介质的封闭腔体中的热驱动换热现象。计算结果表明,在封闭腔体中加入大孔隙率多孔介质后确实能起到强化换热的效果,采用的固体介质的导热性越好,封闭腔体中流体的热驱动能力越强,换热效果越好。而且采用导热性比较好的固体介质时,在大孔隙率范围内,随着孔隙率的减少,封闭腔体中流体的热驱动能力和换热均得到增强。

Based on the exploration of the turbine blade super cooling technology, a numerical simulation is used to investigate the thermally driven heat transfer phenomenon in an enclosure filled with the porous medium in a centrifugal force field. Results show that the enclosure can achieve better heat transfer effect after filled with the high porosity porous medium. The better the heat transfer effect is, the stronger the thermally driven power is. Thus when the solid medium with good conduction is used, the thermally driven power and the heat transfer effect can be enhanced with the decrease of the porosity under high porosity.