直接火焰燃料电池热应力分析及性能研究  

Thermal Stress Analysis and Performance Characterization of Direct Flame Fuel Cell

作　　者：王雨晴[1] 史翊翔[1] 余先恺 蔡宁生[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《燃烧科学与技术》2014年第3期238-244,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51106085)

摘　　要：针对直接火焰燃料电池建立了二维有限元分析模型,对由于火焰温度分布不均匀而引起的燃料电池热应力进行分析,并利用Weibull方法对其失效概率进行了计算.火焰温度的不均匀分布极大提高了燃料电池的失效概率,因此均匀分布的火焰温度对于直接火焰燃料电池的稳定运行至关重要.本文设计并构建了一个基于Hencken型平焰燃烧器的新型直接火焰燃料电池装置,以甲烷为燃料,利用Hencken型平焰燃烧器产生稳定且均匀分布的平面富燃扩散火焰.在不同燃料流速下测定了电池性能,电池最大功率密度达到400,W/m2.A two-dimensional model of direct flame fuel cell （DFFC）using the finite element method was developed to analyze the thermal stress brought about by the non-uniformity of the flame temperature. The failure probability of the fuel cell was defined and estimated by employing the Weibull statistic. The results reveal that the uniformity of the flame temperature is vital in the DFFC system since the non-uniform distribution of the flame temperature greatly increases the failure probability. A direct flame fuel cell setup was designed and built in this study based on the Henckentype flat flame burner which provided steady and uniform fuel-rich multi-element diffusion flame. Direct flame fuel cell experiments were performed for different flow rates using methane as fuel. The cell performance reached maximum power density of 400 W/m^2.

关 键 词：直接火焰燃料电池 火焰均匀性 热应力 Hencken型平焰燃烧器 

分 类 号：TK16[动力工程及工程热物理—热能工程]