柱形轮毂型式循环水泵的水力及结构特性

为了研究柱形轮毂型式循环水泵的水力及结构性能,采用CFD软件对循环水泵装置进行数值模拟和结构计算,将其与传统球形轮毂轴流泵的水力性能进行对比分析,并通过模型试验验证数据的可靠性.结果表明:轮毂型式的改变主要对叶轮的水力性能产生影响,对导叶和进出水流道的影响很小.在设计工况下,柱形循环水泵装置的扬程3.35 m,效率86.29%,最高效率86.69%;而球形轮毂轴流泵装置的扬程3.19 m,效率85.63%,最高效率85.74%.2种型式的泵装置扬程相差约0.16 m,效率相差约0.66%,性能差距较明显.柱形循环水泵的扬程在全工况下均大于球型轴流泵;循环水泵的效率曲线在设计流量和大流量下均显著高于轴流泵,在小流量下二者的效率曲线差别很小.循环水泵叶轮的最大应力出现在叶轮进口轮毂与叶轮连接区域,最大位移出现在叶片进口靠近轮缘的位置;随着流量的增大,叶片的最大应力和最大位移均逐渐减小.研究结果可以为轴流泵的叶轮设计和发展提供参考依据.

Hydraulic and structural characteristics of cylindrical hub type circulating water pump

In order to study the hydraulic and structural performance of circulating water pump, CFD software was used to carry out numerical simulation and structural calculation of circulating water pump device. First, the hydraulic performances were compared between the circulating water pump and traditional axial-flow pump device, and then the reliability of the data was verified through model tests. The results show that the change of the hub type mainly affects the hydraulic performance of the impeller chamber but it has little effect on the vane, or the inlet and outlet water passages. Under the design condition, the circulating water pump device has a head of 3.35 m, an efficiency of 86.29% and a maximum efficiency of 86.69% while the traditional axial-flow pump device has a head of 3.19 m, an efficiency of 85.63% and a maximum efficiency of 85.74%. The difference of head between two pump devices under the design condition is about 0.16 m, and the difference in efficiency is about 0.66%. The difference of hydraulic performance is obvious. The head of circulating water pump device is higher than that of the traditional axial-flow pump device under all working conditions. The efficiency of the circulating water pump device is significantly higher than that of the axial-flow pump device at the design flow rate and large flow rate. The difference of efficiency is small at small flow rates. The maximum stress of the circulating pump impeller occurs in the area where the impeller inlet hub is connected to the impeller. The maximum displacement occurs in the area where the inlet vane is near the rim. As the flow rate increases, the maximum stress and maximum displacement of the blade gradually decrease. The research results provide a reference for the design and development of the impeller of axial-flow pump.