横向风速和喷雾压力对降尘喷雾特性的影响

Influence Analysis of Lateral Wind Speed and Spray Pressure on the Characteristic of Dust Removal Spray

利用Fluent数值模拟软件对喷嘴喷雾特性参数进行定量分析,建立风速为2 m/s、喷雾压力分别为8. 0、10. 0、12. 5 MPa,以及喷雾压力为8. 0 MPa、风速分别为1、3 m/s共5种模拟方案,分析雾滴质量浓度的分布及雾滴速度。模拟结果表明:当横向风速由1 m/s增至3 m/s时,喷雾射程由4. 0 m减至1. 8 m,距喷嘴2 m的垂直平面上雾滴最高质量浓度由0. 12 kg/m^3降到0. 03 kg/m^3,表明风速越高,雾滴速度衰减越快,到达同一平面时的雾滴质量浓度及速度越小;当喷雾压力由8. 0 MPa升至12. 5 MPa时,喷雾射程由2. 4 m增至3. 0 m,距喷嘴2 m的垂直平面上雾滴最高质量浓度由0. 08 kg/m^3增至0. 10 kg/m^3,粒径小于25～30μm的雾滴所占比例由70%增至90%,说明喷雾压力越高,喷雾效果越好,雾滴的抗风能力越强,到达同一平面时的雾滴粒径越小,雾滴质量浓度及速度越大。

Fluent numerical simulation software was used to conduct quantitative analysis on spray characteristic parameters of the nozzle,and a total of 5 simulation schemes were established,including wind speed was 2 m/s,spray pressure was8. 0 MPa,10. 0 MPa and 12. 5 MPa respectively,and spray pressure was 8. 0 MPa,wind speed was 1 m/s and 3 m/s respectively,the distribution of droplet concentration and droplet velocity were analyzed. The simulation results show that when the lateral wind speed increases from 1 m/s to 3 m/s,the spray range decreases from 4. 0 m to 1. 8 m,the maximum concentration of fog drops on the vertical plane 2 m from the nozzle decreases from 0. 12 kg/m^3 to 0. 03 kg/m^3,indicating that the higher the wind speed is,the faster the droplet velocity decays,and the smaller the droplet concentration and velocity are when they reach the same plane;when the spray pressure increases from 8.0 MPa to 12. 5 MPa,the spray range increases from^2. 4 m to 3. 0 m,the maximum concentration of fog drops on the vertical plane 2 m from the nozzle increases from 0. 08 kg/m^3 to 0. 10 kg/m^3,the proportion of fog drops with particle size less than 25 μm to 30 μm increases from 70% to 90%,indicating that the higher the spray pressure is,the better the spray effect is,and the stronger the anti-wind ability of fog drops is,and when reach the same plane,the smaller the particle size is,the larger the mass concentration and velocity are.