供气式低压射流曝气器结构优化数值模拟研究
|
摘要
以供气式低压射流曝气器为研究对象,运用流体力学分析(CFD)软件对其建立三维模型,用Fluent软件模拟分析其结构参数(一级喷嘴直径、二级喷嘴直径、混合室长径比)对混合室内湍流混合效果的影响。正交试验结果表明,对两相湍流混合效果的影响因素为:一级喷嘴直径>混合室长径比>二级喷嘴直径,最佳湍流混合效果的结构参数是一级喷嘴直径14mm、二级喷嘴直径46mm、混合室长径比4,结构优化后,混合室内气液两相的分布更均匀,混合效果更优。
In this paper,the low-pressure air-forced jet aerator was selected as research object,its threedimensional model was established by using CFD software,and the influence of structure parameters of aerator,including the primary nozzle diameter,the secondary nozzle diameter,the mixing chamber aspect ratio,on turbulent mixing effect in mixing chamber was simulated by Fluent simulation software.The results of orthogonal test showed that the order of factors affecting the mixing effect of gas-liquid two-phase turbulence was as follows:the primary nozzle diameter>the mixing chamber aspect ratio>the secondary nozzle diameter.The optimal structural parameter was the primary nozzle diameter of 14 mm,the secondary nozzle diameter of 46 mm and the mixing chamber aspect ratio of 4.After the structure optimization,the gas-liquid two-phase distribution in the mixing chamber was more uniform and the mixing effect was better.
In this paper,the low-pressure air-forced jet aerator was selected as research object,its threedimensional model was established by using CFD software,and the influence of structure parameters of aerator,including the primary nozzle diameter,the secondary nozzle diameter,the mixing chamber aspect ratio,on turbulent mixing effect in mixing chamber was simulated by Fluent simulation software.The results of orthogonal test showed that the order of factors affecting the mixing effect of gas-liquid two-phase turbulence was as follows:the primary nozzle diameter>the mixing chamber aspect ratio>the secondary nozzle diameter.The optimal structural parameter was the primary nozzle diameter of 14 mm,the secondary nozzle diameter of 46 mm and the mixing chamber aspect ratio of 4.After the structure optimization,the gas-liquid two-phase distribution in the mixing chamber was more uniform and the mixing effect was better.
引文
[1]彭宏,杨忠明,吴金苗.新型射流曝气器的研究与应用[J].环境工程,2012,30(5):135-139.
[2]张安龙,张佳晔,王先宝,等.基于三维数值模拟的供气式低压射流曝气装置性能优化研究[J].环境污染与防治,2018,40(10):1152-1156.
[3]FAN H,QI L,LIU G,et al.Aeration optimization through operation at low dissolved oxygen concentrations:evaluation of oxygen mass transfer dynamics in different activated sludge systems[J].Journal of Environmental Sciences,2017,55:224-235.
[4]王羽,汪群华,芮延年,等.高速大跨度转刷曝气机磁流变主动减振控制技术[J].机械设计与研究,2012,28(6):46-48.
[5]李小利,马安然,赵继红.新型射流曝气外置式MBR处理乳品废水[J].膜科学与技术,2012,32(2):100-103.
[6]魏文权.小空间组合喷管推力测量系统研究[D].南京:南京航空航天大学,2017.
[7]ALI B A,PUSHPAVANAM S.Analysis of unsteady gas-liquid flows in a rectangular tank:comparison of Euler-Eulerian and Euler-Lagrangian simulations[J].International Journal of Multiphase Flow,2011,37(3):268-277.
[8]CHAKIB B,MOHAMMED H.Numerical simulation of air entrainment for flat-sloped stepped spillway[J].Journal of Computational Multiphase Flows,2015,7(1):33-42.
[9]褚宏奎.鲜杏无水清洗喷嘴的研究设计[D].石河子:石河子大学,2017.
[10]姚萌,贺延龄.与射流曝气器充氧性能相关的一些因素[J].工业水处理,2004,24(4):74-76.
[11]张佳晔.供气式低压射流曝气器的能耗分析及性能优化研究[D].西安:陕西科技大学,2018.
[12]曹广斌,贾惠文,蒋树义,等.循环水养鱼系统中臭氧射流混合设备设计与性能测试[J].农业工程学报,2011,27(10):73-78.
[13]张建伟,刘思源,冯颖,等.多喷嘴撞击流混合器径向流场数值模拟研究[J].沈阳化工大学学报,2017,31(1):50-55.
[2]张安龙,张佳晔,王先宝,等.基于三维数值模拟的供气式低压射流曝气装置性能优化研究[J].环境污染与防治,2018,40(10):1152-1156.
[3]FAN H,QI L,LIU G,et al.Aeration optimization through operation at low dissolved oxygen concentrations:evaluation of oxygen mass transfer dynamics in different activated sludge systems[J].Journal of Environmental Sciences,2017,55:224-235.
[4]王羽,汪群华,芮延年,等.高速大跨度转刷曝气机磁流变主动减振控制技术[J].机械设计与研究,2012,28(6):46-48.
[5]李小利,马安然,赵继红.新型射流曝气外置式MBR处理乳品废水[J].膜科学与技术,2012,32(2):100-103.
[6]魏文权.小空间组合喷管推力测量系统研究[D].南京:南京航空航天大学,2017.
[7]ALI B A,PUSHPAVANAM S.Analysis of unsteady gas-liquid flows in a rectangular tank:comparison of Euler-Eulerian and Euler-Lagrangian simulations[J].International Journal of Multiphase Flow,2011,37(3):268-277.
[8]CHAKIB B,MOHAMMED H.Numerical simulation of air entrainment for flat-sloped stepped spillway[J].Journal of Computational Multiphase Flows,2015,7(1):33-42.
[9]褚宏奎.鲜杏无水清洗喷嘴的研究设计[D].石河子:石河子大学,2017.
[10]姚萌,贺延龄.与射流曝气器充氧性能相关的一些因素[J].工业水处理,2004,24(4):74-76.
[11]张佳晔.供气式低压射流曝气器的能耗分析及性能优化研究[D].西安:陕西科技大学,2018.
[12]曹广斌,贾惠文,蒋树义,等.循环水养鱼系统中臭氧射流混合设备设计与性能测试[J].农业工程学报,2011,27(10):73-78.
[13]张建伟,刘思源,冯颖,等.多喷嘴撞击流混合器径向流场数值模拟研究[J].沈阳化工大学学报,2017,31(1):50-55.