Flow Analysis and Geometry Design on the inlet and outlet of the multiple fuel channels of PEMFC

• Main Authors: Yen-Cheng Lin, 林晏正
• Other Authors: Chen-I Hung
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/28533057829038605417

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === Fuel cells are used for power generation with low emission and high efficiency. Fuel cell will become one of the potential alternative energy sources in the future, and currently, the most emergent issue is to raise the cell power density. The major advantages of Proton Exchange Membrane Fuel Cell (PEMFC) are: low-temperature operation, quick starting, high energy density, long-life operation, solid non-corrosive electrolyte, and simple design. Therefore, the wide applications of PEMFC can be found in many industries and transportations, such as the power source of hybrid vehicles and 3C household appliances. Then, in this study, the PEMFC is the target of study. One of the important problems in the design of multiple fuel channels for PEMFC is, how to make the reaction rate of fuel gas in every channel to be as uniform as possible. This problem cannot be found in the single-channel design of PEMFC. By the appropriate geometry design at the entrance and outlet of every channel, the fuel can be controlled to equally flow into each channel. Then the reaction rate between the fuel gas and diffusion layer in each channel will be the same and the dead zone would not be happened in some channel. In this study, the numerical simulations of flow fields will be carried out to assess the influence of entrance and outlet geometry design on the electrochemistry performance of cell. It is hoped that, with the simulation result, the optimal geometry design of each channel entrance can be proposed. Keywords：Proton Exchange Membrane Fuel Cell( PEMFC), Entrance-Outlet Design, CFD