多级离心泵新型空间导叶设计及优化分析

为提高多级离心泵性能设计了一种新型导叶,借鉴扭曲离心叶轮和流道式导叶的设计方法,通过固定内缘型线和外缘型线生成导叶三维扭曲导流叶片.该导叶正、反导叶光滑连接形成新的空间扭曲叶片,把导叶分割成几个独立的连续变化的流道,有助于减小导叶水力损失.针对一种海水淡化高压多级离心泵,设计了多组新型导叶方案,利用CFD 软件计算分析,探究了新型空间导叶的设计规律.通过对不同方案性能对比分析,获得了优化的导叶模型,并做了样机试验,该模型具有较好的水力性能,在设计工况点效率达到85.68%,满足设计要求,验证了该设计方法的可行性.该设计方法将有利于多级离心泵的节能,同时也为导叶开发提供了有益的参考.

Design and optimization of new-type space guide vanes for multistage centrifugal pump

In order to improve the performance of multistage centrifugal pumps, a new guide vane was designed. The basic design principle originated from the twisted centrifugal impeller and runner guide vanes design method. By fixing the inner edge line and outer edge line, a twist surface of new guide vane was shaped. The guide vane smooth was linked up with positive and negative vanes, and a twisted blade was formed. The vanes were split into several independent continuous varying flow channels, which helps reduce water loss of guide vanes. For a high-pressure multistage centrifugal pump, different configurations of guide vane were developed. Through the evaluation of the different configurations of guide vane, by means of CFD analysis, the design rule of new-type space guide vane was studied. An optimal configuration was obtained, and by prototype testing the model had better hydraulic performance, its efficiency reached 85.68% at the design point to meet the design requirements, which proved the feasibility of this design method. This method will facilitate energy saving of multistage centrifugal pumps, and provide a useful reference for the development of guide vane.