自动喷水灭火工作过程的数值模拟比较

Evaluating the accuracy of simulations of automatic sprinkler system operation

为了研究自动喷水灭火系统与火灾相互作用的规律,利用ISO9705火灾标准试验间,对火源和室内外温度相同的条件下,只有火源燃烧无喷淋作用及火源偏置有喷淋作用2种情况进行了试验研究.并以实验结果作为参照对象,分别用场模拟和双层区域模拟方法对火灾房间内的热释放速率和设定温度点的温度变化情况进行了数值模拟和规律性分析.2种数值模拟计算与实验结果对比表明,场模拟和区域模拟均可较好地预测喷淋系统的工作状态.对于自动喷水灭火系统的工程应用和研究,用数值模拟方法是可行的,而且效率较高.

Using ISO9705 standard fire test chamber, test conditions were designed for 2 cases ： a fire source burning without a sprinkler system; a non-centrally placed fire source with a sprinkler system. The fire sources and tem peratures were identical for both indoor and outdoor physical tests. With the experimental results as reference, we made numerical simulations for specific thermal releasing rates and temperature gradients at designated points in the fire chamber by use of field simulation model and two-layer zone simulation model. The changing laws of specific thermal releasing rates and temperature gradients were analyzed. By comparing the simulation results with experi- mental ones, it was shown that both the field simulation model and two-layer zone model effectively predict the operation condition of a sprinkler system. For engineering applications that require testing of automatic sprinkler systems, numerical simulations are reliable and more efficient.