The scaling relation of flame without water mist and the scaling relation of some properties of water mist were discussed.The experiments of putting out fire with water mist were done in 2 spaces which ratio of linear size is 3.33 with nozzles followed scaling relation.The critical flux to put out the fire with different power was tested and the results were analyzed to make sure the reliability of scale simulation Usage of the conception of effective spout diameter made the flux of nozzle and the initial velocity at spouts meet the requirement of scale simulation.The standardized fire extinguishment data matched better when the ratio of height of nozzle to the diameter of effective spout diameter is 1 750.%讨论无细水雾时火焰的尺度关系及细水雾施加时细水雾相关特性的尺度关系,选择符合尺度关系的喷头,在线性尺度比为3.33的两个空间内进行细水雾灭火实验,测量不同火源功率下的临界灭火水流量,并分析实验结果,以考察尺度模拟方法的可靠性.使用有效喷口直径这一概念可以保证喷头流量与雾滴在喷口处的初始速度均能满足尺度模拟要求.当喷头高度与有效喷口直径比约为1 750时,两种尺度下的标准化灭火数据吻合较好.
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