首页|流道扰流体对固体氧化物燃料电池温度梯度的影响研究

流道扰流体对固体氧化物燃料电池温度梯度的影响研究

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固体氧化物燃料电池(solidoxidefuelcell,SOFC)内部过高的温度梯度会导致电池失效,如何降低SOFC温度梯度、提高电池温度分布的均匀性至关重要.结合电、热、流动和传质物理场建立了 SOFC多物理场耦合模型,通过与实验数据对比验证了模型准确性;通过SOFC模型研究了 SOFC温度和温度梯度分布情况,确定了电池反应区最大温度梯度为优化指标,提出了扰流体流道结构设计,并在考虑功率密度的影响情况下,证明了扰流体结构的有效性.对扰流体结构的形状、高度和宽度进行了分析讨论,分析发现:扰流体主要是通过改变流体流速和反应层氧气浓度来影响反应区最大温度梯度的,扰流体对于流道压降的改变主要影响了损失功率密度;最终确定了圆弧扰流体结构(h=0.8mm,d1=4.0mm)为较优结构,在净功率密度与传统直流道相同时,最大温度梯度为43.35 K/cm,相比传统直流道,降低了 9.4%.
Study on effect of flow channel obstacles on temperature gradient of SOFC
The excessively high temperature gradient inside solid oxide fuel cell(SOFC)can lead to failure of the cell,so it is critical to reduce the temperature gradient in the SOFC and enhance the uniformity of the cell temperature.By combining with the electrical,thermal,flow,and mass transfer physical fields,a multi-physics field coupling model of the SOFC is established.The accuracy of the model is verified by comparing with the experimental data.The SOFC temperature and temperature gradient distributions are investigated by the SOFC model and the maximum temperature gradient in the cell reaction zone is determined as the optimization objective.The obstacle structure in flow channel is designed,and the effectiveness is proved.The shape,height and width of the obstacle structure are discussed and analyzed.It is found that the obstacle affects the maximum temperature gradient in the reaction zone mainly by changing the fluid flow rate and the oxygen molar concentration in the reaction layer.The change of the obstacle for the pressure drop in the flow path mainly affects the power density loss.Finally,the circular obstacle(h=0.8 mm,d1=4.0 mm)is identified as the optimal structure.With the same net power density as the conventional channel,the maximum temperature gradient is 43.35 K/cm,which is 9.4%lower than that of the conventional channel.

solid oxide fuel cellmultiphysics field coupling simulationtemperature gradientstructure of the obstacle

戴潼雨、李鸿坤

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西南交通大学机械工程学院,四川 成都 610031

固体氧化物燃料电池 多场耦合仿真 温度梯度 扰流体结构

国家自然科学基金项目四川省自然科学基金项目

523061152023NSFSC0832

2024

热力发电
西安热工研究院有限公司,中国电机工程学会

热力发电

CSTPCD北大核心
影响因子:0.765
ISSN:1002-3364
年,卷(期):2024.53(7)
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