【作者】 王超越； 王福军； 叶长亮； 肖若富；

【Author】 WANG Chaoyue;WANG Fujun;YE Changliang;XIAO Ruofu;College of Water Resources & Civil Engineering, China Agricultural University;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System;

【机构】 中国农业大学水利与土木工程学院； 北京市供水管网系统安全与节能工程技术研究中心；

【摘要】 作为大功率立式离心泵的重要过流部件,径向导叶的设计直接影响水泵能量特性和运行稳定性。以往研究发现,适当提高导叶流道扩散度有利于提高水泵水力效率,但目前尚缺乏保证流动稳定性的高扩散度径向导叶轴面流道设计方法。针对这一不足,本文首先基于扩散流道流动稳定性分析提出了一种明确而简单的设计方法,而后将其应用至现有的立式离心泵水力模型,并将新方案与原方案的能量特性、压力脉动特性和涡动特性进行对比分析。研究表明,本文的设计方法能明显提高导叶域扩散度,显著降低压水室内的水力损失,提高离心泵的最优效率并扩宽高效区范围,还可在一定程度上削减压力脉动幅值。综合来看,本文提出的高扩散度径向导叶轴面流道设计方法能在保证流动稳定性的基础上提高水泵水力性能,可为大功率立式离心泵的经济、稳定运行奠定基础。更多还原

【Abstract】 As an important component of high-power vertical centrifugal pump, the design quality of radial guide vane affects energy characteristics and operation stability of the pump directly. According to previous studies, it is beneficial to improve the hydraulic efficiency of the pump by means of increasing the diffusivity of guide vane channel appropriately. However, there is still a lack of the design method of meridian channel for radial guide vane with high diffusivity that is based on flow stability. Therefore, a clear and simple design method is proposed based on the analysis of flow stability in diffusion channel, and it is also applied to an existing vertical centrifugal pump model. Energy characteristics, pressure fluctuation characteristics and vortex characteristics of the new scheme are compared with the original scheme respectively. The results show that the new design method can significantly improve the diffusivity of the guide vane and reduce the hydraulic loss in the volute casing, which will improve the optimal efficiency of the pump, extend the high efficiency zone and suppress the pressure fluctuation amplitude to a certain degree. In summary, the new design method proposed in this paper can improve the hydraulic performance on the basis of flow stability, which can lay a foundation for the economical and stable operation of the high-power vertical centrifugal pump.更多还原