The feasibility of using FDS in the prediction of ISO 9705 room fire

• Main Authors: Shoung-Yi Huang, 黃雄義
• Other Authors: Kuang-Chung Tsai
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/81198194463221283304

碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 93 === The fire performance of interior finish materials in a compartment plays an important role determining the fire growth therein. ISO 9705 room test is then designed to evaluate its severity and has become one of the most commonly accepted fire testing facility for this purpose. This test is of full scale and can show “real” fire scenario in a compartment. However, this test is very time consuming and the cost is high. Computer simulation is consequently developed This study utilized FDS (Fire Dynamics Simulator) to predict the fire scenario of room test to evaluate the feasibility of using FDS to replace room fire test. Materials selected were gypsum board and fire retardant hardboard to cover non- flame spreading and flame spreading ones. This study was divided into three parts. First, the best set-up method and size of grid used in FDS were determined by trying four kinds of set-up methods and a few possible sizes. Second, material properties for input in FDS were carried out from references. Finally, two room fire tests were conducted with materials selected and the test resulted were compared with FDS prediction. This study showed that cubic grid of ＝0.05 is the best grid scale and time consuming. Therefore, cubic grid of ＝0.1 but with 1:2 aspect ratio finer meshes near the fire source were selected in this study. In addition, from the comparison of room fire tests and FDS prediction, it can be seen that FDS could not be capable of accurately predicting temperature and heat flux to the ground once flame spread occurred. Furthermore, O2, CO, CO2 concentrations were not simulated accurately by FDS. From the discussion above, FDS could not be capable of accurately predicting the fire scenario of ISO 9705 room test.