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使用自行设计的火焰加速试验系统,研究了3种立体结构障碍物对管道内预混火焰传播速度和超压的影响。选用长方体、正四棱柱和圆柱,其阻塞比均为40%。结果表明,管道内障碍物对火焰传播的初始阶段起阻碍作用,当火焰越过障碍物后,障碍物加速火焰传播过程。有障碍物时管道内最大火焰传播速度和峰值超压比无障碍物时要大。随着点火距离的增大,管道中最大火焰传播速度和超压先变大后减小。当障碍物位于约6倍管径处时,对管道中火焰传播速度和超压影响最大。点火距离的改变对火焰传播速度的影响大于对管道内超压的影响。
Using self-designed flame acceleration test system, the effects of three kinds of three-dimensional structural obstacles on propagation velocity and overpressure of pre-mixed flame in pipeline were studied. Use rectangular parallelepiped, regular quadrangular prism and cylinder, the blocking ratio is 40%. The results show that the obstacles in the pipeline impede the initial stage of flame propagation. When the flame crosses the obstacle, the obstacle accelerates the flame propagation. When there is an obstacle, the maximum flame propagation velocity and peak overpressure in the pipeline should be larger than those without obstacles. With the increase of ignition distance, the maximum flame propagation velocity and overpressure in the pipeline first increase and then decrease. When the obstacle is located about 6 times the diameter of the pipe, the flame propagation velocity and overpressure of the greatest impact. The influence of the change of ignition distance on the flame propagation speed is greater than that of overpressure in the pipeline.