Orbal氧化沟水下推进器布置的三维流场数值模拟分析  

3D Flow Field Numerical Simulation Analysis of Underwater Propellers Arrangement in Orbal Oxidation Ditch

作　　者：曹刚[1] 许仕荣[1] 王涛[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湘潭大学自然科学学报》2017年第2期38-44,共7页Natural Science Journal of Xiangtan University

基　　金：国家科技支撑计划(2013BAJ24B03)

摘　　要：通过计算流体力学(CFD)前处理软件GAMBIT构建了Orbal氧化沟三维计算模型,利用CFD商用软件FLUENT中的RNGk-ε湍流数值模型和混合物两相流数值模型,对水下推进器在Orbal氧化沟中布置的三维流场进行了数值模拟分析.结果表明,水下推进器总功率宜为4kW,总功率相同时4组推进器对称布置优于2组推进器.氧化沟直道段曝气转盘下游的水下推进器T1和T3纵向最佳位置在下个转盘上游1/3弯道处,弯道段曝气转盘下游的水下推进器T2和T4则在下个转盘上游1/3直道处.4组推进器横向最佳位置都在离氧化沟内侧3/8沟宽处,垂向都在最小安装高度处.对优化后的氧化沟流场进行了数值模拟,流体平均流速达到了0.5m/s,沟底平均流速大于0.15m/s,氧化沟下层弯道出口内侧流体的SS沉降可能性较高.Based on the computational fluid dynamics（CFD）pre-processing software GAMBIT,a threedimensional computational model of Orbal oxidation ditch was constructed.Numerical simulation of 3D flow field arranged by underwater propeller in Orbal oxidation ditch was carried out by using the RNGk-εturbulence model and mixture two-phase flow model.The results show that：firstly,the total power of the underwater propeller should be 4kW,and the 4 groups of underwater propellers symmetrically arranged are better than the 2 groups when the total power is the same.Next,the longitudinal optimum position of the underwater propeller T1 and T3,which is located in downstream of the aeration turntable straight segment,is at 1/3 bent groove of upper turntable.In addition,the longitudinal optimum position of T2 and T4 is situated in 1/3straight groove of upper turntable.Furthermore,the optimum lateral position of the 4groups is in the 3/8 groove width from the inner side of the oxidation ditch,and the vertical direction is at the minimum installation height.Finally,after the numerical simulation of the optimized oxidation ditch flow field,the average flow velocity reaches 0.5m/s,and the mean flow velocity of ditch bottom is greater than 0.15m/s.The possibility of SS sedimentation is higher in the outlet of the lower corner of the oxidation ditch.

关 键 词：ORBAL氧化沟 水下推进器 三维流场 数值模拟 

分 类 号：X703.3[环境科学与工程—环境工程]