1. School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo　 454003,China;2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo　 454003,China

为研究不同喷雾压力、不同气流速下水雾在管道内的沉降特性,搭建了管道喷雾实验台,采用粒子图像速度仪(PIV)对方形管道内的水雾运动特性进行了测量,分析了喷雾压力和气流速度对水雾沉降特性的影响规律。结果表明:当气流速度一定,喷雾压力从0.1 MPa增加到1.3 MPa时,水雾在喷嘴下游管长为1 m管道内的沉降量增加了96%,沉降的主要原因是碰壁沉降,而在1 m之后的管段内水雾沉降量减少了76%,沉降的主要原因是惯性沉降;当喷雾压力一定,气流速度从1.1 m/s增加到10.4 m/s时,水雾在管长为1 m管道内的沉降量降低了24%,在1 m之后的管道内沉降量减少了17%。

This study assembles a pipeline mist spraying experiment rig and measures the motion characteristics of wa- ter mist in the square pipeline using Particle Image Velocimeter. It explores the settling law of water mist in the pipe- line with various spraying pressure and airflow velocity and analyzes their influences. The results indicate that the set- tling volume increases by 96% in the 1 meter long downstream pipeline,when the spraying pressure increases from 0． 1 MPa to 1． 3 MPa at a set airflow velocity,which is mainly caused by impinging. And the settling volume reduces by 76% in the other parts of the pipeline,which is caused by inertance. But when airflow velocity increases from 1.1 m / s to 10． 4 m / s with a set spraying pressure,the settling volume reduces by 24% in the 1 meter long pipeline and reduces by 17% in the other parts. The results will provide a reliable theoretical basis for gas explosion suppres- sion and the parameter setting of water mist in the safe transportation of low concentration gas.

国家自然科学基金资助项目(U1361205,50974055)；河南省动力工程及工程热物理重点学科资助项目；

Wang Fahui,Yu Minggao,Pei Bei. Settling law of water mist in gas pipeline[J]. Journal of China Coal Society,2016,41(6):1441-1446.