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为研究上行通风网络火灾中并联旁侧支路风流逆转次序的问题,设计并制作了一个包含3条并联支路的小型模拟实验台.在其中1条支路中设置了燃烧器,用来模拟火灾支路;另两条模拟旁侧支路。取旁侧支路长度及初始风速(点火前的风速)的不同组合,分别进行模拟实验.利用热线风速仪和烟迹观测了两条旁侧支路中风流逆转的过程.结果表明:上行风流火灾中两条并联的旁侧支路可以在不同时刻发生风流逆转;风流逆转次序取决于两条支路长度与初始风速的乘积之比;长度与初始风速乘积较小的支路将较早发生风流逆转.
In order to study the order of the wind flow reversal in the side-by-side parallel branches in the upward-ventilated network fire, a small-scale simulation experiment bench with three parallel branches was designed and fabricated. Burners were installed in one of the branches to simulate Fire branch; the other two analog side branches. Taking the length of the side branches and the initial wind speed (the wind speed before ignition), the simulation experiments were carried out respectively.The windward reversal process of two side branches was observed by the hotline anemometer and the smokestack.The results show that the upwind flow The two branches in parallel in the fire can reverse the wind flow at different times. The order of wind flow reversal depends on the ratio of the product lengths of the two branches to the initial wind speed. The branch with the smaller product of the initial wind speed and the wind speed will occur earlier Merry reversed.