背叶片对离心料浆泵性能影响研究

发布时间：2018-06-21 05:57

  本文选题：渣浆泵 + 离心泵　； 参考：《水泵技术》2016年04期

【摘要】：背叶片经常被应用到特种离心泵设计中,它的设计影响了离心泵的扬程、效率等水力性能。文中针对背叶片的高度、形状等几何参数对离心泵的性能影响作了数值模拟研究,分别对设置有后弯式与直型背叶片的四种不同形状的离心泵内部流场作了三维湍流数值模拟,分析了因背叶片高度不同、型线不同对泵水力性能与内部流场的影响。结果表明,带后弯式背叶片的泵扬程和效率均较直型背叶片高。由不同高度背叶片中间截面压力分布图的对比分析发现,随着背叶片高度的减小,背叶片中间截面压力分布越来越均匀。后弯式背叶片中间截面压力分布较直型背叶片的均匀,直型背叶片相邻两叶片之间均存在非常强烈的回流与旋涡,后弯式背叶片随着高度的减小,相邻两叶片中间流道的流动越来越顺畅。随着背叶片高度的减小,其对泵性能的影响程度亦减小,实际上存在一个合理的背叶片高度的取值。本分析结果为离心料浆泵背叶片的设计提供了参考依据。
[Abstract]:The back blade is often applied to the design of special centrifugal pump, which affects the hydraulic performance of centrifugal pump, such as lift and efficiency. In this paper, the effects of geometric parameters such as height and shape of the back blade on the performance of centrifugal pump are numerically simulated, and three dimensional turbulence numerical simulation of the flow field of four different shapes of centrifugal pump with back curved and straight back vane is carried out respectively. The influence of different profile on the hydraulic performance and internal flow field of the pump is analyzed because of the different height of the back blade. The results show that the head and efficiency of the pump with back curved back vane are higher than that of straight back blade. According to the comparative analysis of the pressure distribution map of the middle section of the back blade at different heights, it is found that the pressure distribution of the middle section of the back blade becomes more and more uniform with the decrease of the height of the back blade. The pressure distribution in the middle section of the back curved back blade is more uniform than that of the straight back blade. There are very strong backflow and vortex between the two adjacent blades of the straight back blade, and the back curved back blade decreases with the height of the back blade. The flow of the channel between the adjacent two blades is becoming more and more smooth. With the decrease of the back blade height, the influence on pump performance is also reduced. In fact, there is a reasonable value of the back blade height. The results provide a reference for the design of the back blade of centrifugal slurry pump.
【作者单位】： 北京航天动力研究所;
【分类号】：TH311

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