相对湿度对燃料电池电压衰减影响的渐进分析

为研究相对湿度对车用燃料电池电压衰减的影响,提出了电池阳极相对湿度(anode relative humidity,ARH)模型。建立了燃料电池计算模型和网格,将ARH模型移植到计算流体动力学软件(FLUENT)中,用于计算电池堆中电压衰减最快的单电池。针对C10(距离进气口最远的电池)在不同相对湿度时的FLUENT原模型、ARH模型和实验数值进行了对比分析。结果表明:ARH模型能较准确地计算C10的性能,在相对湿度为100%时,ARH模型比FLUENT原模型精确度提高了10%。为进一步优化燃料电池堆的水管理系统提供了新的思路。

Asymptotic analysis of relative humidity effect on voltage decay of fuel cell

To study relative humidity on the influence of the vehicle fuel cell voltage attenuation,a ARH (Anode relative humidity) model was put forward.The calculation model and grid of fuel cell were established.ARH model was transplanted to computational fluid dynamics software (FLUENT),which was used to calculate the fastest single cell voltage attenuation in the cell stack.Finally,the FLUENT model,the ARH model with the experimental data about the tenth cell at the different relative humidity were compared.The results show that ARH model can accurately calculate the 10th single cell (the single cell of the furthest distance from inlet gas port) performance,when the relative humidity is 100％,ARH model precision improve by 10％ than the original model of FLUENT software.Then a new train of thought was provided for the further optimization of the fuel cell stack water management system.