中文摘要：

为了在保证自吸性能基础上提高立式自吸泵的效率,在传统自吸泵基础上,提出新型立式自吸泵结构.改进气液分离室及其与蜗壳的匹配关系,采用全新的叶轮和蜗形蜗壳结构,并采用多级副叶轮结构代替单级副叶轮密封、以茶壶嘴结构来保证自吸泵的自吸性能.基于内部流动数值模拟分析传统立式自吸泵和新型立式自吸泵内部流动结构,研究产生流动损失的主要部位以及损失机理.数值模拟结果与试验结果取得较好地一致,结果表明,自吸泵相比普通离心泵的额外功耗主要源于气液分离室和副叶轮,改进后的新型立式自吸泵在保证自吸性能的基础上,效率得到明显提高.结果可为类似自吸泵结构的改进设计提供参考.

英文摘要：

To improve the vertical self-priming pump＇ s performance, a novel self-priming pump construction is presented on the basis of the traditional structure. Optimized hydraulic components and matching structures between the volute and the air-water separation chamber were adopted to reduce the hydraulic losses. Multistage auxiliaryqmpeller was used to reduce the mechanical losses while improving the sealing performance. A special discharge structure was also proposed to ensure the self-priming performance. Three dimensional simulation of the internal flow in the self-priming pump was carried out to find the main loss areas and its loss mechanism. The simulation results are in good agreement with the experimental results, and show that the air-water separation chamber and the auxiliary-impeller are the main places of extra loss in the self-priming pump. The experimental results indicate that the improved self- priming pump structure has both good self-priming performance and high efficiency. The new structure of the vertical self-priming pump and its design method can provide reference for the similar pump.