摘要
基于定常不可压流体的控制方程和重整化群湍流模型,应用SIMPLEC算法,计算了不同几何参数的泵站开敞式进水池定常流动。研究表明过小的后壁距将引起进水喇叭口的单向进水趋势,过大的后壁距将导致后壁产生较大区域的回流区;过小的悬空高使得流入喇叭口的水流流线过于弯曲,过大的悬空高将形成喇叭口的单面进水,导致水泵进口的轴向流速分布不均匀。研究显示矩形、梯形和半圆形进水池水力性能相近,ω形进水池的水力性能最佳,进水管流速分布均匀。基于数值模拟结果提出的进水池主要尺寸参数的范围和后壁平面形状,可应用于工程实际。
The open sump is a typical inlet passage of middle and small pumping station. The design parameters of sump affect hydraulic performance of pump. The incompressible N - S equations are solved by the finite volume method. Base on the RNG k -ε model, the SIMPLEC algorithm is applied for the solution of the discretization governing equation. The results illustrate that, excessively small backwall-clearance （T） may lead to unidirectional flow above bellmoth and excessively large T may cause backflows near back wall. It can be observed that curvature of flow near bellmouth appears large while the bottom floor clearance （he） is too small, but excessively large hc may cause larger head loss and non-uniform axial velocity distribution of blade inlet. The results show that the hydraulic performance of rectangle sump, trapezia sump and semicircle sump are similar, and the best one is ω-shape sump because the distributing flowfield of suction pipe is uniform. The numerical simulation results show that the recommenced parameters brought out and the best plane back wall shape and suitable dimensions of sump presented could be applied in projects.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2009年第1期50-55,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(50779060)
江苏省自然科学基金资助项目(BK2007557)
江苏省"青蓝工程"优秀青年骨干教师基金资助项目(苏教(2007)2号)
关键词
进水池
水力性能
几何参数
数值模拟
Sump, Hydraulic performance, Geometrical parameters, Numerical simulation
