摘要
依托南水北调东线一期工程某低扬程泵站的设计参数,基于三维湍流流动雷诺时均N-S方程和RNG k-ε湍流模型,对由肘形进水流道、轴流泵和虹吸式出水流道组成的低扬程立式轴流泵装置模型内部流动进行数值模拟,分析了小流量工况(0.180 m3/s)、设计流量工况(0.299m3/s)和大流量工况(0.360 m3/s)等3个典型工况时的泵装置流态和叶轮叶片表面的压力分布情况,对泵装置模型的能量性能进行预测,并与泵装置模型试验结果进行对比分析.结果表明:泵装置效率的数值计算结果与模型试验结果基本一致,最优工况点附近较为接近,在计算范围内最大差值不超过2%;设计流量工况时泵装置进、出水流道内的三维湍流流动状况,与进、出水流道分别进行数值计算时的状况基本一致;3种不同典型工况时泵装置进水流道内的流场分布状况相同,而出水流道内的流场差别很大.
Relying on the design parameters of a low head pumping station in the first phase of east route in the South-to-North Water Diversion Project, the flow in a low head vertical flow pump system model, which consists of an elbow inlet channel, axial flow pump itself and siphon outlet conduit, is simulated based on the steady 3D turbulent Reynolds averaged N -S equations and RNG k -c turbu- lence model. The flow pattern in the model and the pressure distribution on the impeller blade surfaces are analyzed under three typical conditions, namely, small discharge （0. 180 m^3/s）, design discharge （0. 299 m^3/s） and large discharge （0. 360 m3/s）. The hydraulic performance of the pump model is predicted and compared with the test results. The results indicate that the numerical results are basical- ly consistent with the test data, especially at the best efficiency point, and the maximum error is less than 2% within the flow rate interested. Under design flow condition, the 3D turbulent flows in the inlet and outlet conduits are basically the same as the flows in the inlet and outlet conduits when they are simula- ted separately. The flow fields in the inlet conduit remain the same under different operating conditions, but not in the outlet conduit.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2016年第9期767-773,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51309200)
中国博士后科学基金资助面上项目(2013M540469)
江苏省博士后科研资助计划项目(1301021A)
关键词
低扬程泵站
立式轴流泵
装置
流道形式
水力性能
数值分析
low head pumping station
vertical axial flow pump
pump system
conduit form
hydraulic performance
numerical analysis
