The flow patterns in the inlet and outlet conduits have a decisive effect on the safe, stable, and highly efficient operation of the pump in a large pumping station with low head. The numerical simulation of three-dim...The flow patterns in the inlet and outlet conduits have a decisive effect on the safe, stable, and highly efficient operation of the pump in a large pumping station with low head. The numerical simulation of three-dimensional （3D） turbulence flow in conduits is an important method to study the hydraulic performance and conduct an optimum hydraulic design for the conduits. With the analyses of the flow patterns in the inlet and outlet conduits, the boundary conditions of the numerical simulation for them can be determined. The main obtained conclusions are as follows： （i） Under normal operation conditions, there is essentially no pre-swirl flow at the impeller chamber inlet of an axial-flow pump system, based on which the boundary condition at the inlet conduit may be defined. （ii） The circulation at the guide vane outlet of an axial-flow pump system has a great effect on the hydraulic performance of the outlet conduit, and there is optimum circulation for the performance. Therefore, it is strongly suggested to design the guide vane according to the optimum circulation. （iii） The residual circulation at the guide vane outlet needs to be considered for the inlet boundary condition of the outlet conduit, and the value of the circulation may be measured in a specially designed test model.展开更多
采用雷诺平均纳维斯托克斯方程(RNA S)和标准k-ε湍流模型,运用S IM PLEC算法,对不同工况下某船坞泵站双向配水单侧进水廊道进行三维数值模拟计算,预测了回流区及旋涡发生位置与形态,分析了进水廊道型式、廊道几何参数对廊道内水流流态...采用雷诺平均纳维斯托克斯方程(RNA S)和标准k-ε湍流模型,运用S IM PLEC算法,对不同工况下某船坞泵站双向配水单侧进水廊道进行三维数值模拟计算,预测了回流区及旋涡发生位置与形态,分析了进水廊道型式、廊道几何参数对廊道内水流流态的影响,提出了相应的整流措施,改善了廊道内水流流态,为船坞廊道设计提供了指导.该方法研究周期短,研究成本低,有工程实用价值.展开更多
基金Project supported by the Natural Science Foundation of Jiangsu Higher Education Institutions ofChina(No.12KJD570001)
文摘The flow patterns in the inlet and outlet conduits have a decisive effect on the safe, stable, and highly efficient operation of the pump in a large pumping station with low head. The numerical simulation of three-dimensional （3D） turbulence flow in conduits is an important method to study the hydraulic performance and conduct an optimum hydraulic design for the conduits. With the analyses of the flow patterns in the inlet and outlet conduits, the boundary conditions of the numerical simulation for them can be determined. The main obtained conclusions are as follows： （i） Under normal operation conditions, there is essentially no pre-swirl flow at the impeller chamber inlet of an axial-flow pump system, based on which the boundary condition at the inlet conduit may be defined. （ii） The circulation at the guide vane outlet of an axial-flow pump system has a great effect on the hydraulic performance of the outlet conduit, and there is optimum circulation for the performance. Therefore, it is strongly suggested to design the guide vane according to the optimum circulation. （iii） The residual circulation at the guide vane outlet needs to be considered for the inlet boundary condition of the outlet conduit, and the value of the circulation may be measured in a specially designed test model.
文摘采用雷诺平均纳维斯托克斯方程(RNA S)和标准k-ε湍流模型,运用S IM PLEC算法,对不同工况下某船坞泵站双向配水单侧进水廊道进行三维数值模拟计算,预测了回流区及旋涡发生位置与形态,分析了进水廊道型式、廊道几何参数对廊道内水流流态的影响,提出了相应的整流措施,改善了廊道内水流流态,为船坞廊道设计提供了指导.该方法研究周期短,研究成本低,有工程实用价值.
