Cross-Cabin Spread of Smoke Under the Effect of Ventilation Ducts
The ventilation of ship cabins depends on the ventilation system,but the ventilation ducts are very likely to become hidden paths of smoke spread in fires,resulting in widespread dispersion of fire smoke.Aiming at the problem of cross-cabin spread of smoke in a double-cabin fire,this study took into account two smoke spread paths,ventilation duct and corridor,and combined 1/2 scale experiment with numerical simulation.By analyzing the basic characteristics of temperature distribution and smoke flow in the fire source cabin and adjacent cabin,it investigated the effect of ventilation duct on the cross-cabin smoke spread.The results show that under the effect of thermal buoyancy,the smoke will enter the adjacent cabin earlier through the ventilation ducts and dominate the environment of the adjacent cabin,preventing the smoke in the corridor from flowing in.At the same time,the mass flow rate of smoke in the ventilation duct increases significantly with the increase of the pressure difference between the two cabins,and the relationship is negatively exponential.It is calculated that the total smoke flow rate spreading through the ventilation ducts accounts for about 30%of the total smoke flow rate emanating from the experimental flatform.
万方数据
维普
