基于特征尺寸规则化的竖井贯流泵装置研究

为了探讨竖井贯流泵装置规则化设计方法，选择了二十余座典型大型竖井贯流泵装置作为统计分析对象，通过分析得出了竖井进水流道和出水流道主要控制尺寸合理取值范围。结合实际工程，基于规则化设计方法，设计了叶轮直径3.2 m的大型竖井贯流泵装置。利用三维湍流数值模拟，分析了规则化设计的竖井进出水流道流动特征、水力损失特性以及进水流道出口的速度分布、速度均匀度和入流角。结果表明，基于规则设计的进出水流道流动平顺，设计工况，进出水流道的水力损失为0.064 m、0.096 m，速度均匀度和入流角为97.63%和87.74°。按照模型比尺10.667设计制作模型水泵装置，构建试验系统，开展了模型水泵装置能量特性试验研究。研究结果表明，基于规则化设计的竖井贯流泵装置在特低装置扬程1.08 m，装置效率达77.5%，设计工况点Q = 25 m3/s、H = 0.62 m的效率达66%，水泵装置效率高。研究结果对竖井贯流泵装置的水力优化设计具有重要指导意义。

Shaft tubular pump units based on regularized design

This study examines how to determine the main control sizes and their value ranges of the inflow and outflow passages of shaft tubular pump devices through statistical analysis of more than twenty typical large-scale pump sets of this type, aiming at developing a regularized design method. Using this new method, we design a large shaft tubular pump with an impeller diameter of 3200 mm for a practical project, and use numerical simulations of 3D turbulent flows to analyze hydraulic loss and flow behaviors including the velocity distribution and inflow angle of the shaft passage. Results reveal that the flows in the inlet and outlet passages are satisfactory with hydraulic losses of 0.065 m and 0.096 m respectively. And at the exit of inlet passage, velocity uniformity is 97.5% and flow angle is 87.7?. We conduct experimental tests on a 1:10.67-scale model, focusing on the measurement of energy characteristics. It shows that our shaft tubular pump set, based on the regularized design, achieves a high efficiency: 77.5% at an ultra-low lift of 1.08m, and 66% at the design point of Q = 25 m3/s and H = 0.62 m. These results would help optimize the hydraulic design of shaft tubular pumps.