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新出现的大型地下敞开式汽车库,是通过环绕汽车库设置开敞沟渠、将外墙开敞、以“防火隔离带”替代防火墙、利用顶板洞口和外墙开敞面等措施进行自然排烟。为了检验这种新型汽车库的空气对流情况,文章选定一个已建成的项目进行实际测试。测试时地块环境存在一级风,上午10时、下午14时分别对地块每一跨2 m,3 m高度处的风速进行测试。通过对风速分布统计、防火分区平均风速、逐行和逐列平均风速进行对比,证实汽车库内部存在低速流场和清晰的对流现象。
Emerging large underground open garage, through the garage around the open ditches, open the outer wall, “fire isolation ” instead of the firewall, the use of roof openings and exterior walls and other measures to open the natural Exhaust. In order to test the air convection of this new garage, the article selected a completed project for actual testing. During the test, there was a first-order wind in the block environment. At 10 a.m. and 14 a.m., wind speed at 2 m and 3 m of each span of the block was tested respectively. By comparing the wind speed distribution statistics, the average wind speed of the fire protection zone, the average wind speed per row and column by column, the low speed flow field and the clear convection in the garage are confirmed.