Abstract
This study simulates the ignition process of PMMA plates in a ConeCalorimeter. To simplify calculation, we assume the velocity field to be unchanged during the ignition process. The velocity field of the 2-D steady isothermal larminar flow is solved first. This velocity field isthen used in the energy and species equations to solve for the gas temperature and concentration distributions. In order to examine the effect of gas velocity on the ignition pr ocess, we also simulate the case withoutgas veloctiy. The results indicate the velocity field has a significanteffect on the ignition process and should not be ignored. During the veryearly periold, pre-mixed reaction happens near the plate surface. Gradually, the reaction near the plate center diminishes and a diffuse flame formsabove the plate. No distinct sudden ignition behavior is found, which ispresumably due to a low oxidation activation energy chosen in the computation.