作　　者： (林秀丽）; (潘龙涛）; (杨芹）; (张培红）;

机构地区： 东北大学资源与土木工程学院,辽宁沈阳110819

出　　处： 《广西大学学报（自然科学版）》 2017年第4期1616-1622,共7页

摘　　要： 进行细水雾抑制Φ600 mm酒精池火缩尺模型实验,通过对火焰和燃料表面温度、火源根部附近氧气体积百分比、火焰热辐射和地板接收到的热辐射等参数的测试,对比分析不同压力和雾流量单、双喷头细水雾耦合纵向通风系统的灭火机理及最佳运行参数。结果表明,点火后480 s开启2个K=0.5的细水雾喷头灭火的最佳工作压力为8 MPa,所需雾通量为8.94 L/min。继续增加压力,K=0.5双喷头细水雾灭火效率提高的幅度减小。双喷头细水雾灭火的主导机理为隔绝稀释氧气、火焰的冷却作用以及地板接收到的热辐射的衰减作用。点火后480 s开启火源上风侧单个K=1.2细水雾喷头灭火的最佳工作压力为10 MPa,所需雾通量为12 L/min。单喷头细水雾灭火的主导机理为对燃料表面的冷却作用。 Fire suppression model tests with water mist on Φ600 mm ethanol pool fire were conducted. Flame and fuel surface temperatures,oxygen volume percentage near the fire source root,radiant heat flux of flame and that received by floor, etc. were measured. As a result, fire suppression mechanisms and the optimum operation parameters of single or double water-mist nozzles under different pressure and different spray rate were analyzed. The results show that,if two watermist nozzles（ K = 0. 5） are started 480 s after the fire ignition,the optimum pressure and spray rate are 8 MPa and 8. 94 L/min spray rate,respectively; that the pressure over 8 MPa brings less increase of fire suppression efficiency. The main mechanisms of fire suppression with double watermist nozzles include the dilution to oxygen,cooling effect on flame and attenuation to radiant heat flux received by the floor. If single water-mist nozzle（ K = 1. 2） is started 480 s after the fire ignition,the optimum pressure and spray rate are 10 MPa and 12 L/min,respectively. The main mechanism of fire suppression with single water-mist nozzle is the cooling effect on fuel surface.

关 键 词： 酒精池火 双喷头 细水雾 纵向通风 热辐射