中文摘要：

在通道试验模型中开展了横向排烟试验,对不同火源功率下,通道内烟气层界面的形态特征、烟气层最高温升以及烟气水平流动速度随排烟速度的变化情况进行了研究。结果表明：通道内的烟气在排烟速率较小时能够维持很好的层化,随着排烟速率增大,烟气层与空气之间的掺混加剧,且靠近通道端部开口处的掺混程度强于远处。归一化的烟气层最高温升和烟气水平流动速度均随排烟速率呈幂指数衰减规律。靠近通道端部开口处的最高温升和水平流动速度衰减得更快;靠近通道端部开口处与远离通道端部开口处的烟气流动速度差异随排烟速率增大而增大。

英文摘要：

Transverse smoke extraction tests were carried out in a reduced scale channel model. The configuration characteristics of the smoke-air layer interface, the maximum temperature rise of smoke layer and the horizontal spreading velocity of smoke flow were investigated under different extraction rates. The results show that the smoke layer maintains good stratification under a small extraction rate, whereas mixing is intensified between the upper smoke layer and lower ambient air with the increase of the extraction rate. Stronger mixing is found at the location near the channel portal. It is found that both the normalized maximum temperature rise and the horizontal spreading velocity decay exponentially with extraction rates, which both decay faster at the location near the channel portal. The difference between the spreading velocities at locations near and far away from the portal becomes larger with the increase of extraction rate.