基于CFD的孔板格栅过水性能研究
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摘要
以武汉三金潭污水处理厂应用的内进流式非金属孔板格栅项目为案例,采用VOF模型及多孔介质模型对孔板格栅对污水进行过滤时的流动特性进行了数值模拟。分析了污水经过孔板格栅时的流速分布,以及过水量、开孔率对孔板两侧液位差和过孔流速的影响。结果表明:流速在格栅宽度方向上对称分布,在液位差最大处流速最大;在相同的开孔率条件下,随着过水量的增加,孔板两侧液位差增加,过孔流速也增加,并且随着开孔率的逐渐增大,过孔流速变化幅度减小,当开孔率趋近于1时,过孔流速等于入口流速;相同的过水量时,随着开孔率的增加,孔板两侧液位差随之减小,过孔流速明显降低,并且随着过水量的逐渐增大,过孔流速变化幅度有所减小。
With the case of internal inflow non-metallic orifice-plate screen project applied in a sweage treatment plant, the flow characteristics with respect to the sewage filtering by the orifice-plate screen were numerically simulated with the VOF model and multi-porous medium model. The flow velocity distribution of the sewage through the orifice-plate screen was analyzed as well as the influence of the water-flow volume and boring-rate on liquid level difference and velocity via bore on both sides of the orifice-plate. The results showed that the flow velocity, whose maximum was found at the maximum liquid level difference, was symmetrically distributed in the width direction of the screen. On the condition of the same boring-rate, with the gradual increase of the water-flow volume, the liquid level difference on both sides of the orifice plate increased as well as the velocity via bore. With the gradually increase of the boring-rate, the change range of velocity via bore narrowed. When the boring-rate approached 1, the velocity via bore was equal to inlet velocity. On the condition of the same water-flow volume, as the boring-rate increased, the liquid level difference on both sides of the orifice plate decreased and the velocity via bore decreased obviously. With the gradual increaes of the water-flow volume, the change range of velocity via bore narrowed slightly.
With the case of internal inflow non-metallic orifice-plate screen project applied in a sweage treatment plant, the flow characteristics with respect to the sewage filtering by the orifice-plate screen were numerically simulated with the VOF model and multi-porous medium model. The flow velocity distribution of the sewage through the orifice-plate screen was analyzed as well as the influence of the water-flow volume and boring-rate on liquid level difference and velocity via bore on both sides of the orifice-plate. The results showed that the flow velocity, whose maximum was found at the maximum liquid level difference, was symmetrically distributed in the width direction of the screen. On the condition of the same boring-rate, with the gradual increase of the water-flow volume, the liquid level difference on both sides of the orifice plate increased as well as the velocity via bore. With the gradually increase of the boring-rate, the change range of velocity via bore narrowed. When the boring-rate approached 1, the velocity via bore was equal to inlet velocity. On the condition of the same water-flow volume, as the boring-rate increased, the liquid level difference on both sides of the orifice plate decreased and the velocity via bore decreased obviously. With the gradual increaes of the water-flow volume, the change range of velocity via bore narrowed slightly.
引文
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[2] 李辉.孔板细格栅在 MBR 工艺预处理系统改造中的应用[J].给水排水,2016,42(2):92-96.
[3] 谷京泽,马宁,张炯.未来科技城再生水厂两种细格栅设备的选择[J].北京水务,2014,(3):42-44.
[4] 梁汀,蒋岚岚,张万里,等.中空纤维膜MBR污水处理工艺中细格棚系统设计探讨[J].给水排水,2014,40(4):99-101.
[5] 时俊雯,孙龙泉,刘莹.冷却液舱内水下气体射流的数值模拟[J].船舶工程,2016,(s2):38-42.
[6] 易思强,杨建明.基于多孔介质模型的凝汽器水侧三维CFD建模[J].发电设备,2017,31(2):81-85.
[7] 赵军,朱庆强,范德顺.多孔介质模型的纤维球过滤器数值模拟[J].化工机械,2012,39(3):343-346.
[8] 关大玮,程香菊.基于VOF模型的溢流坝三维水流数值模拟[J].中国水运(下半月),2015,15(6):51-55.
[9] 马涛,樊红刚,袁义发,等.基于VOF模型的泵站进水池流场计算研究[J].水力发电学报,2013,32(6):244-249.
[10] 尤学一,刘伟.两相流相界面迁移的数值模拟[J].水动力学研究与进展,2006,21(6):724-729.
[11] 冯喜平,赵胜海,李进贤,等.不同湍流模型对旋涡流动的数值模拟[J].航空动力学报,2011,26(6):1209-1214.
[12] Lee H,Kharangate C R,Mascarenhas N,et al.Experimental and computational investigation of vertical downflow condensation[J].International Journal of Heat & Mass Transfer,2015,85:865-879.
[13] Koutsourakis N,Bartzis J G,Markatos N C.Evaluation of Reynolds stress,k-ε,and RNG k-ε,turbulence models in street canyon flows using various experimental datasets[J].Environmental Fluid Mechanics,2012,12(4):379-403.
[14] Nield D A,Bejan A.Convection in Porous Media[J].Springer Berlin,2011,108(2):284-290.
[15] 张毅.车辆散热器模块流动与传热问题的数值分析与试验研究[D].杭州:浙江大学,2006.
[16] 姚军,李亚军,黄朝琴,等.裂缝性油藏等效渗透率张量的边界元求解方法[J].油气地质与采收率,2009,16(6):80-83.
[17] 杨钊,程景才,杨超,等.非对称陶瓷膜管渗透性能的CFD模拟研究[J].化工学报,2015,66(8):3120-3129.
[18] Rezaei H,Ashtiani F Z,Fouladitajar A.Fouling behavior and performance of microfiltration membranes for whey treatment in steady and unsteady-state conditions[J].Brazilian Journal of Chemical Engineering,2016,31(2):503-518.
[19] Sonnenwald F,Stovin V,Guymer I.Feasibility of the porous zone approach to modelling vegetation in CFD[M].2016.
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