成果報告書詳細
管理番号20090000000606
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 固体高分子燃料電池の流動・物質拡散数値シミュレーションの研究開発
公開日2010/3/2
報告書年度2008 - 2008
委託先名国立大学法人北海道大学
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 固体高分子形燃料電池(PEFC)は将来の自動車用動力装置などとして有望視されており、実機環境下での性能特性や最適形状設計などの実用化技術開発の発展が不可欠といえる。本研究では、燃料電池内の作動ガスおよびイオン、電気化学反応による水(蒸気)の移動をはじめとする複合現象を予測可能な流動解析ソフトウェアを新規開発し、PEFCの実用化技術開発に際して有用な数値シミュレーションを実現することを目的として、PEFCマルチフィジックス流動シミュレーション・ソフトウェアの新規開発を進めてきた。さらに、その改良および実証を行い、固体高分子形燃料電池(PEFC)を始めとする燃料電池の実用化開発に際して有用な数値シミュレーション技術の提供を目指している.これらの研究目標の実現のため、平成20年度に実施した研究の概要と成果を以下に述べる。
英文要約This research has aimed to offer a useful numerical simulation technology when the flow analysis software that can forecast these phenomena of the fuel cell is newly developed. This research in 2008 proceeds the following developments and investigations;
(1) Development of high accuracy and high performance of multi-physics fluid flow simulation in PEFC:
Three dimensional gas flows in micro channel and GDL are simulated to investigate the effect of GDL deformation by the assembly tilting pressure and thermal coupling. Mathematical models for water transport in porous media and catalyst layer are also investigated for predicting the liquid water saturation for in GDL.
Aiming a higher resolution and accuracy, numerical methods for the large scale parallel computation are improved and validated. Improved algorithms for the PEFC simulation code (FrontFlow/PEFC) have been also developed in order to improve numerical stiffness problems in these pressure equation of porous media and electric potential equation of the catalyst layer.
(2) Investigation of water transport mechanism based on direct numerical simulation by Lattice Boltzmann method:
Numerical simulations using the lattice Boltzmann method (PEMFC-LBM) were developed to elucidate the dynamic behavior of condensed water and gas flow in a PEMFC. Here, the calculation process of the LBM simulation was improved to extend the simulation to a porous medium, and a stable and reliable simulation of two-phase flow with large density differences in the porous medium was established. It was shown that dynamic capillary fingering can be simulated at low migration speeds of liquid water in a modified GDL, and the LBM simulation, which considers the actual physical properties of the system, has significant advantages in evaluating phenomena affected by the interaction between liquid water and air flows. Furthermore, a parallelization and an efficiency improvement of simulation code were applied to the PEMFC-LBM to realize the large scale 3-dimentional simulations.
(3) Development and validation of PEFC simulation models:
For the purpose of investigation and analysis of gas-liquid two-phase flow phenomenon in the gas diffusion layer (GDL) of PEFC, we have developed a microfluidic device which mimics the microscopic porous structure of GDL and performed the flow visualization using it. A PDMS-based soft-lithography technique is employed here to make microscopic structures in a flow channel. As examples, two kinds of PDMS devices with different layouts of pillars; orderly arrayed one (0.05 mm square pillars with 0.1 mm high, 0.05 mm intervals) and randomly arrayed one, which enable to observe the typically different injection patterns and the dynamic behaviors with a fluorescent microscope.
For validating the multi-physics fluid flow simulation in PEFC, reference experiment performed by the single cell PEFC in order to evaluate its unsteady characteristics and effects on the PEFC performance.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る