障碍物条件下的甲烷水平喷射火燃烧特性研究

Study on Combustion Characteristics of Methane Horizontal Jet Fire with Obstacles

为探究障碍物条件下甲烷水平喷射火的燃烧特性,搭建了实验装置,从障碍物高度、宽度以及与喷射源距离三个方面进行室内实验。研究结果表明:障碍物的存在能够有效影响火焰的传播;随着障碍物的高度增加,火焰内部局部扰流加强,火焰沿轴线方向的传播速度随之降低;随着障碍物的宽度增加,火焰高度先减小后增大,火焰面积变化不大;随着障碍物与喷射源间距增大,火焰高度先增大后减小,火焰面积不断增大。研究还发现,火焰中心的最高温度基本位于火焰长度的40%~70%位置处,故障碍物位置应设在距离喷射源轴线位置的火焰长度40%~50%处以达到最佳的抑制火焰效果。研究结果能够为以障碍物来控制甲烷水平喷射火危害范围的应用提供理论指导。

In order to explore the influence of obstacles on the combustion characteristics of methane horizontal jet fire,devices for experimentation are established,and the laboratory experiments are carried out from three aspects of obstacle height, obstacle width and distance from injection source. The study results show that the existence of an obstacle can effectively affect the flame propagation. With the increase of obstacle height, the local turbulence inside the flame strengthens, and the propagation velocity of the flame along the axis decreases. With the increase of obstacle width, the flame height decreases first and then increases, but the area of flame has little change. As the distance between obstacle and spray source increases,the height of flame increases first and then decreases,and the flame area increases continuously. The study finds out that the maximum temperature of the flame center is located at 40% to 70% of the flame length, and the location of the fault obstacle should be located at 40% to 50% of the flame length from the axis of the leakage port to achieve the best effect. The study results can provide theoretical guidance for the application of using obstacles to control the hazard range of methane horizontal jet fire.