三通管支管位置对爆炸火焰传播影响分析*

为研究分支管道位置对丙烷爆炸火焰传播的影响规律，通过多组数值模拟与已有实验数据对比，分析不同工况下三通管内火焰传播形态变化特征及温度变化。结果表明:向右传播的爆炸气流在支管左侧形成湍流旋涡，火焰受到拖拽及壁面制约，贴支管右侧壁面呈尖刀状传播；封闭管道中，火焰传播受主管道高速前驱压力波回波影响更显著，垂直支管中火焰与高温风险更大；实验支管位置距离点火源5.6 m时岔口处监测点温度高达2 214.08 K，支管位置增加至5.71 m时，支管处湍流旋涡拖拽火焰，使火焰出现中断，支管移至5.825 m后高温火焰无法传播至支管口，支管中的爆炸风险显著降低。研究结果为工业生产三通管支管位置的选择和支管内二次爆炸风险预测提供科学参考。

Analysis on influence of branch pipe location in T branch pipe on flame propagation of explosion

In order to study the influence of branch pipe location on the flame propagation of propane explosion,the change characteristics of flame propagation shape and the temperature change in the T branch pipe under different conditions were analyzed by comparing the results of multiple groups of numerical simulation with the existing experimental data.The results showed that the explosion airflow propagating to the right direction formed a turbulent vortex on the left side of branch pipe,and the flame was dragged and restricted by the pipe wall,propagating with the shape of sharp knife on the right side wall surface of branch pipe.In the closed pipe,the influence of high temperature precursor pressure wave echo in the main pipe on the flame propagation was more significant,and the risks of flame and high temperature in the vertical branch pipe were greater.When the location of experimental branch pipe was 5.6 m away from the ignition source,the temperature of the monitoring point at the branch was as high as 2 214.08 K.As the distance increased to 5.71 m,the flame was interrupted by the traction of turbulent vortex in the branch pipe.When the branch was moved to 5.825 m,the high temperature flame could not propagate to the orifice of branch pipe,thus its explosion risk was greatly reduced.The results provide scientific reference for the location selection of branch pipe in the T branch pipe with industrial production and the risk prediction of secondary explosion in the branch pipe.