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移动式正压排烟机常被用于建筑火灾时的临时排烟以及火场的人员搜救,为室内提供新鲜空气,提高室内人员的疏散效率以及保证消防员的安全救援。本文通过对气体淹没紊流射流的理论推导,得出了移动式正压排烟机送风距离与通道口高度,风机直径以及风机出口紊流系数的关系式。通过计算机模拟进一步验证了该理论计算方法的合理性。可为消防员在火场中利用正压送风进行排烟操作提供一定的理论依据及技术指导。
Mobile positive pressure smoke exhaust is often used for temporary smoke evacuation in building fires and personnel search and rescue in the fire field to provide fresh air indoors, increase the evacuation efficiency of indoor personnel and ensure firefighters’ safety and rescue. Based on the theoretical derivation of gas submerged turbulent jet, the relationship between the air supply distance of mobile positive pressure smoke exhauster and the height of passageway, the diameter of fan and the turbulence coefficient of fan outlet is obtained. The rationality of the theoretical calculation method is further verified by computer simulation. It can provide some theoretical basis and technical guidance for firefighters to use the positive pressure air supply for smoke exhaust operation in the fire field.