煤矿井下高压喷雾雾化特性研究

Study on atomization characteristics of high pressure spray in underground coal mines

为分析煤矿井下高压喷雾雾化特性,采用自行设计的喷雾降尘实验系统,对雾滴粒径的空间分布以及雾化参数的影响因素进行了全面的研究。结果表明,沿喷嘴轴线方向,随着距喷嘴距离的增加,雾滴粒径不断增大;在离喷嘴一定距离的纵断面上,雾滴粒径由内向外不断增大,但增幅较小。随着喷雾压力的增加,喷嘴流量和雾流射程不断增大,而雾化锥角和雾滴粒径不断减小。在相同的喷雾压力下,随着喷嘴直径的增加,喷嘴流量和雾化锥角不断增大,而雾流射程基本保持不变;随着喷嘴直径的增加,喷雾形成的雾滴粒径也逐渐增加,且增幅越来越大。在相同耗水量下,随着喷嘴直径的增加,喷雾压力和雾流射程不断减小,而雾化锥角和雾滴粒径不断增大。

In order to analyze the atomization characteristics of high pressure spray in underground coal mines,the experimental system designed by authors for spray and dust reduction was used to make a systematic experimental study into the spatial distribution of atomization particle size and the influence factors in atomization parameters. The study results indicate that the particle size of droplets increase with the distance away from nozzle.On the longitudinal section,the particle size of droplets increases from the inside to the outside slightly.With the increase in spray pressure,the nozzle flow capacity and spray range increase,but the spray angle and atomization particle size decrease. With the increase of nozzle diameter,the nozzle flow capacity and spray angle increase accordingly,and the spray range remain almost the same in the case of same spray pressure. Under the same spray pressure,the particle size of droplets increase with the increase in nozzle diameter,and the increase amplitude shows an ascending trend. Under the same water consumption,with the increase of nozzle diameter,the spray pressure and spray range decrease continuously,and the spray angle and the particle size of droplet increase accordingly.