Simplified Modeling of an Aluminum Paricle Combustion

다국어 초록 (Multilingual Abstract)

A simplified model for an isolated aluminum particle burning in air is presented. Burning process consists of two stages, ignition and quasi-steady combustion (QSC). It is assumed that an initial aluminum particle is covered with oxide film. and film thickness is calculated using phase diagram of Al-O and lever rule. Heterogeneous surface reaction (HSR) as well as heat transfer from ambient air is considered for the heat source of ignition. In quasi-steady combustion stage, gas phase reaction occurs so that diffusion flame is assumed. For simplicity, I-dimesional spherical symmetric condition and flame sheet assumption are also used Extended conserved scalar formulations and modified Shvab-Zeldovich functions are used to account for the deposition of metal oxide on the surface of the molten aluminum. Using developed model, time variation of particle temperature, masses of molten aluminum and deposited oxide are predicted. Burning rate, combustion time, flame radius and temperature are also calculated. and compared with some experimental data.

목차 (Table of Contents)

• Abstract
• 1. INTRODUCTION
• 2. MODELING
• 3. RESULTS AND DISCUSSIONS
• 4. CONCLUSIONS
• ACKNOWLEDGMENTS
• REFERENCES