高大空间建筑不同类型火早期烟气运动规律

采用实体试验的方法,选用棉绳和聚氨酯试验火,在大空间建筑中进行早期火灾试验。从火源类型和质量的角度对烟气速度、温度进行对比分析,总结早期火灾烟气在高大空间建筑中的运动规律。棉绳热释放速率小,烟气温度较低,烟羽流受热浮力作用小,烟气速度低,同时由于试验空间高大,烟气无法到达顶棚;聚氨酯燃烧迅速,随着火势和高度的增大烟羽流上升速度加快,上升途中不发生扩散,最终到达试验空间顶棚。质量大的棉绳火烟气温度高,产烟量大,所受热浮力大,速度有较明显上升趋势。质量大的聚氨酯烟气速度和温度变化速率明显比质量小的聚氨酯快。

The analysis of smoke movement of different early fire in the large space building

The cotton strings and polyurethane were used in the early fire test in the real large space building.The change of the velocity and temperature in terms of different fire types and mass were analyzed to summarize the movement rule of smoke in big space building.The low heat release rate and low smoke temperature of cotton strings leads to low thermal buoyancy to smoke,which makes the smoke have low velocity and can not reach the top of big space building.The smoke moves faster as the growth of fire and hei...