接触热阻对燃料电池温度分布影响的数值模拟

Numerical Investigation the Temperature Distribution of PEM Fuel Cell With the Effect of Thermal Contact Resistance

本文采用三维、非等温、以及考虑各向异性扩散层性质的燃料电池模型分析了气体扩散层和流场板肋板之间的接触热阻对电池温度分布和性能的影响。计算结果表明,接触热阻对电池最高温度及温度分布均有很大影响。电池输出电压为0.3 V时,有接触热阻工况电池最大温度高于无接触热阻工况约8.5 K。此外,有接触热阻计算工况扩散层内温度变化平缓,而无接触热阻计算工况扩散层内温度变化较快。因此,对于燃料电池温度分布的准确预测,不能忽略接触热阻的影响。

In this paper,a three dimensional non-isothermal PEM fuel cell model with anisotropic gas diffusion layer（GDL）is applied to investigate the effect of the thermal contact resistance（TCR）between flow plate rib and GDL on cell temperature distribution and performance.From the numerical results,it is found that both the maximum cell temperature and the temperature distribution are greatly affected by TCR.When the output cell voltage equals to 0.3 V,the maximum cell temperature with TCR is about 8.5 K larger than that of without TCR.Furthermore,the temperature of GDL changes more smaller in thermal contact resistance cases,however,the temperature distribution of the GDL is behaved more steeper in the cases without thermal contact resistance.Therefore,it is concluded that,to accurately predict the temperature distribution of a PEM fuel cell,the thermal contact resistance between flow plate rib and gas diffusion layer cannot be ignored.