基于蜂窝仿生流场的质子交换膜燃料电池的性能研究及优化
Performance optimization of proton exchange membrane fuel cell based on honeycomb-like flow field
张凌云 1赵雷 2卢家鹏 1陈辉 2朱学军 3杨涛 3王诚 4杜星2
作者信息
- 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉,430081;清华大学核能与新能源技术研究院,北京,100084
- 2. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉,430081
- 3. 攀枝花学院生物与化学工程学院,四川攀枝花,617000
- 4. 清华大学核能与新能源技术研究院,北京,100084
- 折叠
摘要
为了增强质子交换膜燃料电池(PEMFCs)内部燃料分布的均匀性与水管理能力,本文研究了一种新型的基于仿生结构的蜂窝仿生流场.首先,根据蜂窝结构特征,搭建出三维多相流非等温几何模型并确立PEMFC的数学模型;其次,采用计算流体动力学Fluent软件对模型进行无关性与有效性验证,并对蜂窝仿生流场和常规平行流场的电池性能和燃料分布进行了模拟分析;最后,对比极化性能、气体流速分布、燃料与液态水组分浓度和电流密度分布,验证了蜂窝仿生流场设计的有效性.研究结果表明:采用蜂窝仿生流场的电池峰值功率密度比常规平行流场高15.6%,其内部水管理能力和燃料分布均匀性均强于平行流场;左端进气的蜂窝仿生流场比采用上端进气的蜂窝仿生流场在气体通路内具有更均匀的气体压力,可有效避免流道内产生局部涡流,其峰值功率密度可以达到0.393 3 W/cm2.
Abstract
In order to enhance the uniformity of fuel distribution and capability of liquid water management in the proton exchange membrane fuel cells(PEMFCs),a novel honeycomb-like flow field based on bionic structure was proposed.Firstly,a three-dimensional multiphase flow non-isothermal geometric model was constructed based on the honeycomb structural features,and the mathematical model of PEMFCs was established.Secondly,the model was verified for irrelevance and validity by using the computational fluid dynamics Fluent software.The cell performance and fuel distribution of the honeycomb-like flow field and the conventional parallel flow field were simulated and analyzed.Finally,the effectiveness of the honeycomb-like flow field design was verified by comparing the polarization performance,gas flow velocity distribution,fuel and liquid water component concentration and current density distribution.The results show that the peak power density of the cell with honeycomb-like flow field is 15.6%higher than that of the conventional parallel flow field,which is superior to parallel flow field in internal water management and fuel distribution.Compared with the honeycomb-like flow field with upper intake,the honeycomb-like flow field with left inlet exhibits more uniform gas pressure in the gas passage,which can effectively avoid local eddy current in the flow passage,and its peak power density can reach 0.393 3 W/cm2.
关键词
质子交换膜燃料电池/蜂窝仿生流场/压降/水管理Key words
proton exchange membrane fuel cell/honeycomb-like flow field/pressure drop/water management引用本文复制引用
基金项目
国家重点研发计划项目(2022YFE0207600)
国家自然科学基金资助项目(22105151)
湖北省重点研发计划项目(2022BAA094)
湖北省自然科学基金资助项目(2021CFB124)
湖北省自然科学基金资助项目(2022CFB626)
四川省科技计划项目(2023YFSY0035)
出版年
2024
国家科技期刊平台
NSTL
万方数据