为解决取水泵站预沉池内水流流态紊乱、曝气池及前池存在大面积回流区及旋涡等问题, 针对某一具体水源 地取水泵站, 基于三维不可压缩流体的有限体积法和标准 k2E 湍流模型, 采用 ANSYS CFX 软件对该泵站预沉池、 曝气池及前池进行数值模拟计算。通过对计算结果进行后处理, 分析了取水泵站所选横断面水流流态、流速云图以 及压力云图。在原方案基础上通过对曝气池廊道转角处设置倒圆角、廊道转角内设置/ U0 形导流墙与 1/ 4 弧形导 流墙、前池内设置八字形导流墩及泵机组间设隔墩来对泵站进行优化。优化后改进方案与原方案相比, 廊道转角处 脱流、回流现象得到改善, 曝气池及前池内大范围回流区域消失, 泵站整体水流不存在明显的不良流态。该研究成 果对于优化内水流流态, 预防泥沙沉淀, 提高泵站运行稳定性、高效性、安全性有一定的指导意义。

In o rder to solve the problems of turbulent flow patter n in pr e2sedimentation tank of intake pum ping station, larg e ar ea of reflux zone and vo rtices in aeration tank and for eba y. Based on the f inite vo lume method of thr ee2dimensional incom pr essible fluid and standard k2E tur bulence model, t he numerical simulatio n of pre2sedimentat ion tank, aeratio n tank and forebay o f an in2 take pumping statio n w as carried o ut by using ANSYS CFX so ftwa re. T he aeration t ank and forebay ar e numerically simulat ed, and the flow pattern, v elocity and pressur e co nto ur of the selected cr oss2section of the intake pumping statio n ar e analyzed. T he pumping statio n is optimized by setting fillets at the corridor cor ner o f the aerat ion tank, U2shaped diversio n wa ll and qua rter arc diversion wall in the co rridor cor ner of the o rig inal scheme. Splayed div ersion piers are set in the fo rebay and diversion piers are set betw een pump units. Com par ed w ith the original scheme, the phenomenon o f flow separat ion and reflux in the co rridor co rner of the orig inal scheme has been impr oved. The lar ge2scale reflux area in the aer atio n tank and the fo rebay disappears, and ther e is no obvio us bad flow patter n in t he over all flow o f pumping station. The research r esults have certain g uiding sig nificance for o pt imizing the inter nal w ater flow, prev enting sediment sedimentatio n, and im pr oving the st abilit y, efficiency and safety of pumping statio ns.

国家自然科学基金( 51779214) ; 江苏省第五期/ 333 高层次人才培养工程0 ( BRA2018382) ; 江苏省工信厅 2018 年度第二批省级 工业和信息产业转型升级专项资金