多级毛细梯度复合流场气液分相输运的微型甲醇燃料电池研究

项目名称： 多级毛细梯度复合流场气液分相输运的微型甲醇燃料电池研究

项目编号： No.51275076

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 梁军生

作者单位： 大连理工大学

项目金额： 80万元

中文摘要： 微型直接甲醇燃料电池（μDMFC）具有高比能、高效率、无污染等独特优势，是PowerMEMS领域的研究热点。随着μDMFC流场尺寸的大幅减小，反应物和生成物气液混合输运中的毛细阻塞限制了电池性能的进一步提高。本项目将在前期工作基础上，针对这一瓶颈问题提出基于多级毛细梯度结构原理，实现气液分相输运的μDMFC流场设计新思路。结合理论分析、数值计算和原型试验方法，探明毛细梯度微结构中气-液物种的分相输运机理；研究阴、阳极微流场气液分相输运结构几何参数与表面参数的设计方法，获得多级毛细梯度复合流场结构参数及其各级匹配关系对气液分相输运效能的影响规律。最后，采用MEMS工艺实现毛细梯度复合流场结构的制备和验证。本项目研究涉及机械、材料、流体、新能源等领域，是典型的多学科交叉前沿课题，研究成果将对PowerMEMS技术发展起重要推动作用。

中文关键词： 燃料电池；毛细梯度；流场；分相输运；MEMS

英文摘要： Micro direct methanol fuel cell (μDMFC) has been considered as a hot spot in the field of Power MEMS due to its benefits such as high energy capacity, high efficiency and low emission. However, with the significant shrinkage of the flow field dimension, performance of the μDMFC has been limited by capillary block in flow channels during mixed phase, gas-liquid transportation. Base on the findings in our previous researches, a new μDMFC flow field design concept with the function of gas-liquid separative transportation, using multilevel gradient capillary structures, is proposed in this project. The mechanism of gas-liquid separative transportation in this gradient capillary structure, as well as the design methodologies of the corresponding flow field are to achieved by combining theoretical analysis, numerical simulations and prototype experiments. Impacts of the geometrical parameters and surface property of the gradient capillary structure on the gas-liquid separative efficiency will also be revealed. Finally, the new concept flow field is to be fabricated and verified by using MEMS technics. This project is an intersectional frontier project which involves in the field of mechanics, materials, fluid and new energies. Results of this project will provide important progresses in Power MEMS technologies.

英文关键词： Fuel Cell；Capillary Gradient；Flow Field；Phase-separative transportation；MEMS