特低扬程泵站水力性能研究

采用数值计算和物理模型试验方法研究特低扬程泵站的水力性能,并以苏州市东风新平面S形轴伸泵为例,对其内、外特性,包括装置的水力性能、流道沿程典型断面流速分布、空化特性及进出水流道的水头损失进行分析研究。通过对数值模拟计算及物理模型试验成果的逐项对比,证明数值模拟方法在特低扬程泵装置性能研究中具有良好的应用价值,特别是在高效率附近区域,数值模拟计算成果具有良好的精度。对断面流速分布和流道水力损失等内特性的进一步分析,揭示了不同工况下泵站性能差异的原因,为进一步优化流道型线提供了依据。

Study on hydraulic characteristics of low lift head pumping station

The numerical simulation method and physical model test were used for study of the hydraulic peffonnance of the low lift head pumping station. With the S-shaped Dongfengxin horizontal axial-flow pump of Suzhou City as an example, the hydraulic performance of the device, the flow velocity distribution in typical cross-section, the cavitation characteristics, and the water head loss in inlet and outlet channels were analyzed. The comparison of the results of the above two methods shows that the numerical simulation method is effective for study of the hydraulic characteristics of the low lift head pumping device, especially, the result of numerical simulation is of high precision near the high efficiency region. The further analysis of the flow velocity distribution in cross-section and water head loss in flow channel reveals the cause of performance difference of pumping stations tmder different operational conditions, and the result provides a basis for further optimization of the shape of flow channels.