横向风速和喷雾压力对降尘喷雾特性的影响
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摘要
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.
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.
引文
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[14]程卫民,聂文,周刚,等.煤矿高压喷雾雾化粒度的降尘性能研究[J].中国矿业大学学报,2011(2):189-194.
[15]周刚,程卫民,王刚.综放工作面粉尘场与雾滴场耦合关系的实验研究[J].煤炭学报,2010(10):835-838.
[16]程卫民,周刚,左前明.喷嘴喷雾压力与雾化粒度关系的实验研究[J].煤炭学报,2010(8):753-757.
[2]张延松.高压喷雾及其在煤矿井下粉尘防治中的应用[J].重庆环境科学,1994,16(12):32-36.
[3]周刚.综放工作面喷雾降尘理论及工艺技术研究[D].青岛:山东科技大学,2009.
[4]马素平,寇子明.喷雾降尘机理的研究[J].煤炭学报,2005(3):298-300.
[5]马素平,寇子明.喷雾降尘效率的研究与分析[J].太原理工大学学报,2006(3):327-330.
[6]金春玉.空心圆锥雾化喷嘴喷雾实验与数值研究[D].上海:上海交通大学,2017.
[7]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.
[8]杨胜来.综采工作面粉尘运移和粉尘浓度三维分布的数值模拟研究[J].中国安全科学学报,2001,11(4):61-64.
[9]王鹏飞,刘荣华,汤梦.煤矿井下高压喷雾雾化特性及其降尘效果实验研究[J].煤炭学报,2015(9):872-876.
[10]徐厚学,施国华,郑彦奎.综采面采煤机割煤粉尘分布特性及防治技术[J].煤矿安全,2013(3):39-43.
[11]陈贵,王德明,王和堂,等.大断面全岩巷综掘工作面泡沫降尘技术[J].煤炭学报,2016(11):63-65.
[12]聂文,程卫民,周刚,等.掘进面喷雾雾化粒度受风流扰动影响实验研究[J].中国矿业大学学报,2017(3):273-276.
[13]程卫民,聂文,姚玉静,等.综掘工作面旋流气幕抽吸控尘流场的数值模拟[J].煤炭学报,2011(8):839-843.
[14]程卫民,聂文,周刚,等.煤矿高压喷雾雾化粒度的降尘性能研究[J].中国矿业大学学报,2011(2):189-194.
[15]周刚,程卫民,王刚.综放工作面粉尘场与雾滴场耦合关系的实验研究[J].煤炭学报,2010(10):835-838.
[16]程卫民,周刚,左前明.喷嘴喷雾压力与雾化粒度关系的实验研究[J].煤炭学报,2010(8):753-757.