Based on comparing structural features of different tubular pumping systems and technical characteristics of cut off devices in common use, aiming at the characteristics of low head, shorter annual operation time and higher safety and reliability requirements of city flood control pumping stations, a new type shaft tubular pumping system was invented, which is composed of a shaft suction box, a tubular pump and a siphon type discharge passage with a vacuum breaker valve as cutoff device. Taking a real pumping station in Yancheng city as an example, the computational fluid dynamics method was adopted to analyze the internal flow of the new type model tubular pumping system and predict its energy performances. The time averaged Navier-Storks equations were closed by RNG k-ε turbulent model to adapt internal flow of siphon type discharge passage with larger curvatures. The method of multi-reference frame(MRF) was used to deal with the coupling of rotating impeller and static guide vane, and SIMPLEC algorithm was adopted to achieve the coupling solution of velocity and pressure. Computational results show that the internal flow of the new type shaft tubular pumping system through preliminary optimization is smooth, and the model pumping system efficiency reaches 56.0% when the design head and the relevant discharge are 1.15 m and 0.326 m3/s respectively, and up to 68.8% when the maximum head and the relevant discharge are 1.95 m and 0.296 m3/s respectively.
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