中文摘要：

通过全尺寸模拟实验研究了细水雾和机械排烟共同作用下小室火灾烟气特性。实验中通过改变变频器频率来调节风量和风速,通过封堵来改变排烟口位置及其开口大小,研究分析了细水雾和机械排烟共同作用下火场的温度和CO体积分数变化。实验结果表明,随着排烟强度的增加,细水雾灭火时间延长,烟气平均升温速率和平均降温速率均下降,CO体积分数降低。排烟口位置的不同对细水雾灭火效果影响较大。

英文摘要：

Based on full-scale experimental simulation,the smoke characteristics under applications of water mist and mechanical ventilation were studied.The wind flux and speed were adjusted through changing of the transducer frequency,while the position and size of smoke vent were changed through blocking,then the temperature and CO concentration under applications of water mist and mechanical ventilation were tested and analyzed.The results show that,with increase of smoke ventilation intensity,the fire extinction time with water mist becomes longer,while the mean temperature rise rate and the CO concentration reduces.The position of smoke exhaust has evident effects on fire extinguishing with water mist in the test cases.Key wrods： water mist;pool fire;mechanical smoke exhaust;smoke exhaust rate;fire suppression