水平管道内障碍物数量对瓦斯爆炸过程的影响研究

为了研究水平管道内障碍物数量对瓦斯爆炸的影响,利用自制的水平管道式气体爆炸试验装置,选用阻塞率为60%的圆环型障碍物,在常温常压下对管道内障碍物数量分别为1片、3片、5片和7片时瓦斯(试验气体为甲烷与空气的混合物,下同)爆炸过程进行试验研究。结果表明:瓦斯的爆炸压力及其上升速率均随障碍物数量的增加呈先增后减的变化规律,而火焰传播速度则随着障碍物数量的增加单调递增,但递增幅度逐渐减小。在密闭置障管道内瓦斯的爆炸压力及其上升速率随测试位置长径比的增大先减小后增大,而火焰传播速度则随测试位置长径比的增大单调递减。

Study on the Influence of Obstacle Quantity on Gas Explosion Process in Horizontal Pipe Device

In order to explore the effect of obstacle quantity on gas(mixture of methane and air) explosion process,an experimental horizontal pipe device for gas explosion was used.Rings with a blockage ratio of 60% were selected as obstacles.Experiments on gas explosion process were done.The mixture was at normal temperature and pressure and had constant composition before explosion.The numbers of obstacles tested in the experiments were 1,3,5 and 7.The results show that both the explosion pressure and its rising rate first increase and then decrease as the obstacle quantity increases.The flame speed increases with the number of obstacles but the increasing amplitude becomes smaller gradually.In the closed pipe with obstacles,both explosion pressure and its rising rate first decrease and then increase with the increasing of distance expressed as the slenderness ratio.The flame speed reduces with the distance expressed as slenderness ratio simply.