不同类型火源下烟气在大空间内的充填特性研究

在大空间火灾试验厅内采用沙发作为火源，研究了烟气层的发展过程，并将得出的烟气层温度、烟气层下降曲线与油池火对比。结果表明：不同的火源条件下，烟气的温升曲线和烟气层下降曲线是不同的，对于稳定的油池火，烟气层下降曲线是光滑的，对于非稳定火源，烟气层下降曲线存在跳变现象；烟气层厚度较小时，火源热释放速率的大小对烟气层的温度、烟气层的下降速率有着重要影响；对于变热释放速率情况下的烟气充填，可以采用对热释放速率的分段近似来进行模拟分析。

Study on the smoke filling in large space atrium under different type of fire

A sofa has been used as a fire source in large space and the smoke development has been studied. The smoke layer temperature and smoke descending curve were contrasted with pool fire. The following conclusions were made: under the different condition of fire, the smoke temperature curve and the smoke descending curve are different, for the steady fire, the smoke descending curve is smooth, but for the sofa fire, there are jumps in the curve; the heat release of fire had great influence on the smoke layer temperature and smoke layer descending velocity when the smoke layer is thin; for the varying heat release rate fire, the smoke filling can be analyzed by a subsection linear curve which is approximate to the heat release rate curve.