Influence of Ventilation Status on Combustion Characteristics of Coach Fire

Based on the principle of oxygen consumption, relationship between heat release rate of coach fire and ventilation factor is studied. The peak heat release rate of coach fire is estimated under four typical ventilation conditions: one window, two windows, four windows and all windows of the fire coach are opened, respectively. Results were compared with the predictions by traditional empirical formulas for flashover in confined space. A suitable calculation method for forecasting the heat release rate of coach fire is presented. CFD means were also applied to simulate and analyze the impact of the ventilation factor on the burning characteristics of coach fire. The results indicate that the calculation method can predict the heat release rate of coach fire well. The peak heat release rate of coach fire is proportional to the ventilation factor. The calculation results are 6.3MW, 8.4MW, 12.6MW and 39.7MW and simulation results are 6.5MW, 9.9MW, 14.8MW and 39 MW respectively under different ventilation conditions in this study. The results also show that the heat release rate and of coach fire increases with the increase of ventilation factor.