In general, a PEMFC was assembled by using a number of locked bolts. But this assembly will cause concentrated loads existed on the upper and lower portions of the end plates, so that the pressure distributed non-uniformly at the internal structures in the PEMFC and thus causing uneven distributed deformations of flow-channel plates. This phenomenon may lead to the leak of reaction gas, and causing not only the decrease of the efficiency of PEMFC, but also the increase of the dangerous. If the fuel cell size getting smaller, the influence may be more severely.
The main aim of this study is to simulate the response of a micro-PEMFC numerically by utilizing a 3-D FEM model while the micro-PEMFC was assembled by three pairs of bolts along the upper and lower portions, respectively, of the end plates. The effects of different bolts locking sequences on the deformation and pressure distributions at flow-channel plates and on the porosity of gas diffusion layers in the micro-PEMFC were investigated. The simulated results showed that if one locked the middle bolt either on the upper or lower portion first, then the obtained uniformities of warpage, deformation, von Mises stress and porosity were superior than the corresponding obtained results if one locked either one of the four corner bolts first. Also, among the three pairs of bolts used for assembling the cell, the first locking bolt of the first pair of locking bolts and the first locking bolt of the rest of two pairs of locking bolts were suggested on the reverse portions of the end plates.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0803110-104114 |
| Date | 03 August 2010 |
| Creators | Chen, Li-chong |
| Contributors | Jung-Hung Sun, Chi-Hui Chien, Ting-Nung Shiau, Chun-Hung Chen, Thai-Ping Chen |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803110-104114 |
| Rights | withheld, Copyright information available at source archive |
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