虹吸式出水贯流泵装置结构特点及对比试验研究?

广泛应用于低扬程和特低扬程泵站的贯流泵装置,传统设计基本采用平直管出水的结构型式。针对城市防洪泵站扬程低、年运行时间短、安全性和可靠性要求高的特点,提出了5种新型虹吸式出水流道的贯流泵装置结构型式,它们具有结构简单、断流可靠、安装检修方便、维修和养护成本低等优点。在保持模型泵不变的情况下,采用CFD数值模拟技术,进行了不同结构型式的虹吸式出水贯流泵装置数值分析、优化水力设计和性能预测。根据优化设计结果,在高精度试验台上进行了虹吸出水和直管出水的竖井贯流泵装置模型对比试验。试验结果表明,两种竖井贯流泵装置的水力性能基本接近,平直管出水和虹吸式出水都是合适的低扬程泵站出水流道结构型式;在特低扬程情况下,采用虹吸式出水流道的泵装置结构型式具有更明显的优势。

Structural Features and Comparison Tests of Different Tubular Pumping Systems with Siphon Outflows

Tubular pumping systems which are widely applied in the low and extra-low head pumping stations usually adopt the structure of straight outflows in the conversional design. In order to meet the requirements of low head, short annual operation time, and high safety and reliability in the municipal flood control pumping stations, five structural types of tubular pumping systems with siphon outflows were proposed, and they have the advantages of simple structure, reliable shut-down device, convenient installation and maintenance, and cheap cost of operation and management. Under the condition of unchanged model pump, CFD simulation technology was used to perform the numerical analysis, optimal hydraulic design, and performance prediction of various tubular pumping systems with siphon outflows. According to the optimization results, a comparison test of the shaft-type tubular pumping systems with straight and siphon outflows was carried out in the model test stand with high accuracy. The model test results showed that hydraulic performances of two outflows are similar so that the structural types of straight and siphon outflows are both suitable for the low head pumping station when the tubular pumping system is used. For the extra-low head pumping station, the tubular pumping systems with siphon outflows have significant advantages compared with those with straight outflows.