通过在传统直流道中加入微导流块提出一种改良流道设计。将导流块在流道内交错布置,以实现对气流的扰动作用,引起对流传质并增强反应气体的质量传递;基于CFD方法,建立新型导流块流道质子换膜燃料电池（PEMFC）三维、稳态、非等温两相模型,研究PEMFC的输出性能、氧气质量分数以及气体流速,定量分析导流块数量对燃料电池性能的影响,并与传统直流道PEMFC进行对比,揭示了改良流道提升PEMFC输出性能的机理。其中含有8个导流块的改良流道与传统直流道相比,最大电流密度提升18.73%,燃料电池峰值功率密度提升8.46%,其净功率密度达到0.6208 W/cm2。
Abstract
This study develops an improved flow field design by incorporating micro-guide blocks into a traditional straight channel. The guide blocks are arranged in a staggered manner within the flow field to induce airflow disturbances, promoting convective mass transfer and enhancing the transport of reactant gases. A three-dimensional, steady-state, non-isothermal two-phase model of a PEMFC with the novel guide block flow field was developed using the CFD method. The study systematically investigated the output performance, oxygen mass fraction, and gas flow velocity of the fuel cell. The quantitative analysis was conducted to evaluate the impact of the number of guide blocks on fuel cell performance and compared the results with a traditional straight channel PEMFC.The results elucidate the mechanism by which the improved flow field enhances the output performance of the PEMFC. The flow channel with 8 flow-guide blocks, compared to the traditional straight flow channel, shows an 18.73% increase in maximum current density and an 8.46% improvement in the peak power density of the fuel cell, achieving a net power density of 0.6208 W/cm2.
关键词
质子交换膜燃料电池 /
数值模型 /
传质 /
结构优化 /
流场 /
优化设计
Key words
proton exchange membrane fuel cells /
numerical models /
mass transfer /
structural optimization /
flow fields /
optimization design
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参考文献
[1] JIAO K, XUAN J, DU Q, et al.Designing the next generation of proton-exchange membrane fuel cells[J]. Nature, 2021, 595(7867): 361-369.
[2] 韩雪梅, 谈金祝, 刘永昌, 等. PEM燃料电池接触压力和电化学性能的研究[J]. 太阳能学报, 2016, 37(11): 2978-2982.
HAN X M, TAN J Z, LIU Y C, et al.Study on contact pressure and electrochemical performance of PEM fuel cell[J]. Acta energiae solaris sinica, 2016, 37(11): 2978-2982.
[3] 廉钰弢, 郑明刚. PEMFC圆形双极板径向流场环形肋板孔道研究[J]. 太阳能学报, 2022, 43(7): 9-15.
LIAN Y T, ZHENG M G.Study on holes of ring-shaped rib in radial flow fields of circular bipolar plate for PEMFC[J]. Acta energiae solaris sinica, 2022, 43(7): 9-15.
[4] 张拴羊, 杨其国, 徐洪涛, 等. 不同流场结构对PEMFC性能影响的模拟研究[J]. 太阳能学报, 2023, 44(8): 62-67.
ZHANG S Y, YANG Q G, XU H T, et al.Numerical simulation on effect of different flow fields on performance of pemfc[J]. Acta energiae solaris sinica, 2023, 44(8):62-67.
[5] 孙峰, 苏丹丹, 殷宇捷, 等. PEMFC翅脉流道传质及输出性能分析[J]. 太阳能学报, 2022, 43(6): 414-419.
SUN F, SU D D, YIN Y J, et al.mass transfer and output performance analysis of wing vein flow channel in PEMFC[J]. Acta energiae solaris sinica, 2022, 43(6): 414-419.
[6] 武生威, 付丽荣, 刘维峰, 等. 新型拓展流道PEMFC传质模拟与性能研究[J]. 太阳能学报, 2023, 44(5): 74-79.
WU S W, FU L R, LIU W F, et al.mass transfer simulation and performance study of PEMFC with new extended flow channel[J]. Acta energiae solaris sinica, 2023, 44(5): 74-79.
[7] HEIDARY H, KERMANI M J, DABIR B.Influences of bipolar plate channel blockages on PEM fuel cell performances[J]. Energy conversion and management, 2016, 124: 51-60.
[8] HEIDARY H, KERMANI M J, PRASAD A K, et al.Numerical modelling of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells[J]. International journal of hydrogen energy, 2017, 42(4): 2265-2277.
[9] LI W K, ZHANG Q L, WANG C, et al.Experimental and numerical analysis of a three-dimensional flow field for PEMFCs[J]. Applied energy, 2017, 195: 278-288.
[10] WANG L, HUSAR A, ZHOU T H, et al.A parametric study of PEM fuel cell performances[J]. International journal of hydrogen energy, 2003, 28(11): 1263-1272.
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