狭长空间不同间距挡烟垂壁阻滞火灾烟气蔓延数值模拟

为了研究狭长空间防火挡烟设施的效果,通过数值模拟方法,研究了狭长空间中两挡烟垂壁间距对烟气阻滞作用的影响规律。研究结果发现,烟气越过前挡烟垂壁后,根据烟气流动状态可分为3个流动区域,即涡旋区、涌波区和定常流动区。当后挡烟垂壁位于涌波区,挡烟垂壁间距3~6m时,阻烟效果最佳。

Numerical Simulation of Fire Smoke Spread Retarded by Smoke Barriersof Different Spaces in Long-narrow Space

In order to study the effect of fire and smoke prevention facilities in long-narrow spaces,the influence regulations of the space between two smoke barriers on the smoke retardation effect in a long-narrow space were studied.The results showed that too large or too small the space between the smoke barriers would reduce the smoke retardation effect.After analysis of the smoke velocity vector diagram,it was found that the smoke after the front barrier could be divided into three flow areas according to the flow state,namely the vortex area,surge area and steady flow area.The smoke retardation effect is best when the rear smoke barrier is located in the surge zone.The simulation results of the used model show that the best smoke blocking effect is when the smoke barrier space is 3~6m.At this time,the rear smoke barrier is located in the surge area,confirming the analysis result of the smoke velocity vector diagram.