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Date of Publication:2022-10-06

Journal:工程热物理学报

Issue:1

Page Number:165-167

ISSN No.:0253-231X

Abstract:Based on a two-step kinetic mechanism, a two-dimensional, unsteady, numerical model is presented for reverse smoldering propagation in horizontally packed beds of polyurethane foam. The model takes heat transfer into account between solid phase and gas phase. The effects of airflow velocity are numerically simulated on smoldering velocity and average maximum temperature of smoldering fuel by using the model. The results show that, firstly, increasing the inlet gas velocity can increase spread rate. And then the smoldering velocity reaches the maximum value (0.0096 cm/s). As the inlet gas velocity is further increased, the smoldering velocity gradually decreases and quenching occurs. However, the inlet gas velocity has little effect on the average maximum temperature. The effects of YO2, and the evolution of gas species and solid compositions are numerically studied. The temperature profile is simulated for smoldering polyurethane foam.

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