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研究氢气/空气预混火焰加速过程的物理机理对氢气爆炸灾害预防和控制有重要意义。采用压力-时间记录法和纹影法两种测试方法,开展了常温常压下二元燃料氢气/丙烷和空气混合气体在带有阻塞比为0.5的孔板形障碍物、40 mm×40 mm×3 000 mm的方管中预混火焰传播物理机理的试验研究。结果表明,由压力传感器所测的火焰传播速度沿管道轴线方向先增加后逐渐减小。通过纹影法所测的火焰传播速度在可视化范围内逐渐增加。火焰加速初始阶段的主要物理机理是火焰表面积增加、燃烧产物膨胀和障碍物间的延迟燃烧等。
It is important to study the physical mechanism of H2 / air premixed flame acceleration to prevent and control hydrogen explosion disaster. The pressure-time recording method and schlieren method were used to test the pressure drop of hydrogenated propane and air mixture under the normal temperature and pressure conditions with orifice shape obstruction with a blockage ratio of 0.5, 40 mm × 40 mm EXPERIMENTAL STUDY ON PHYSICAL MECHANISM OF PREMIXED FLAME PROPAGATION IN A TUBE OF × 3 000 mm. The results show that the flame propagation velocity measured by the pressure sensor firstly increases and then decreases along the axis of the pipeline. Flame propagation speed, as measured by the smear method, gradually increases within the visualization range. The main physical mechanism in the initial stage of flame acceleration is the increase of flame surface area, the expansion of combustion products and the delayed combustion between obstacles.