离心力场下多孔介质的不同孔隙率对热驱动换热影响的研究

以涡轮叶片新型超级冷却技术的研究为背景,在具有冷却通道的新型冷却结构中加入多孔介质,采用实验与数值模拟相结合的方法研究了不同孔隙率条件下,新型冷却结构的热驱动换热规律,实验和计算结果基本一致.研究结果表明不同孔隙率条件下,该新型冷却结构具有相同的换热规律:随着旋转速度、热流密度和冷气进口速度的增大,该结构的热驱动换热能力逐渐增强.同时实验研究发现,随着孔隙率的增大,热驱动换热效果降低.

Effect of different porosity on thermally driven heat transfer in a centrifugal force field

Based on the background of the turbine blade super-cooling technology,porous medium was installed in a new kind of cooling configuration with cooling tunnels. Experiments and numerical simulations were carried out to investigate the thermally driven heat transfer rules in the new kind of cooling configuration with different porosity in a centrifugal force field.The results of experiments are basically consistent with that of the numerical simnlalions.Study shows that the heat transfer processes of the new cooling configuration are identical under different porosity.The thermally driven heat transfer of the cooling configuration filled with porous medium can be enhanced by increasing rotating speed,heat flux and cooling air speed.At the same time,the heat transfer effect is weakened with the increase of the porosity.