成果報告書詳細
管理番号20090000000610
タイトル*平成20年度中間年報 固体高分子形燃料電池実用化戦略的技術開発 次世代技術開発 PEFC流路内液滴二相流現象の解明およびフラッディング抑制セルの研究開発
公開日2010/3/2
報告書年度2008 - 2008
委託先名国立大学法人九州大学
プロジェクト番号P05011
部署名燃料電池・水素技術開発部 燃料電池グループ
和文要約以下本編抜粋:1. 研究開発の内容及び成果等 PEFCはさらなる発電性能・耐久性の向上を図るために、拡散層や流路内の凝縮水による拡散・流動阻害(フラッディング)を低減する必要がある。本研究ではこの液滴滞留問題に着目し、(1)流路内(2)拡散層内の液滴滞留状態について、解析と実験により検討を行う。またこれらの二相流現象を考慮した(3)単セル規模の内部現象予測を解析により行う。具体的には発電時の液滴の挙動、発電性能低下要因、円滑な液滴排出のための必要条件を実験と解析により把握し、また耐フラッディング性能を有する高出力・高安定セルに繋がる最適条件に関する知見を得ることを目的とする。以下平成20年度分の成果を報告する。
英文要約In the recent study of Polymer Electrolyte Fuel Cell (PEFC), it is discussed that diffusion inhibition in gas diffusion layer and flow inhibition in gas channels caused by liquid water need to be reduced with the moderate humidity so that the cell output performance and the durability would be more improved. The subject of this research is the flooding of liquid water in gas diffusion layer and gas channels, and the following things are examined by experiments and numerical analysis: the condition of liquid water in a cell, the mechanism of degradation, and the necessary condition to discharge liquid water smoothly. Furthermore, the following thing is examined with these data, too: the optimal shape of gas channel and the optimal structure of gas diffusion layer that lead to high output and high stable cell. In this research, the following results were obtained. (1) The behavior of moving droplets in channels could be calculated by modified Lattice Boltzmann Method, and this data was compared with the experimental results. (2) The performance of mass transfer in wet GDL was examined by numerical analysis which was developed by our past study, and the relationship between saturation and relative diffusion coefficient of each GDL was obtained. And other types of GDL were developed numerically. Especially, the change of structure with binder could be modeled. In addition, new 3D pore network model in GDL was developed in order to calculate in more complex porous structure. In experiments, the decrease of cell voltage caused by droplets in channel and the dynamic behavior of liquid water in GDL were measured with a small visualized cell. And the various MPL structure was made by controlling MPL paste, the effects of the MPL surface and the overlapped structure with GDL on the cell performance and the mass transfer performance were examined. In addition, simulated GDL/MPL structure was developed numerically, and the structural properties were evaluated. (3) The behaviors of droplets in channels and GDL were modeled, and the reaction and two-phase flow analysis model in a single cell was developed.
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