细水雾在瓦斯输送管道中的沉降规律

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%。

Settling law of water mist in gas pipeline

This study assembles a pipeline mist spraying experiment rig and measures the motion characteristics of water mist in the square pipeline using Particle Image Velocimeter.It explores the settling law of water mist in the pipeline with various spraying pressure and airflow velocity and analyzes their influences.The results indicate that the settling 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 suppression and the parameter setting of water mist in the safe transportation of low concentration gas.