水力发电学报2013，Vol.32Issue(2)：257-260,270,5.
水泵水轮机“S”特性及其性能改善
S-shaped characteristics of pump-turbine and improvement on its performance
摘要
Abstract
When a pump-turbine operates in the mode with S-shaped characteristics, its load rejection is difficult and its water pressure takes an unusual increase, causing an intensification of its mechanical vibrations. To explore the origin of such characteristics and corresponding improvement measures, this study conducted a CFD analysis of the full flow and an energy test for a pump-turbine under the conditions of synchronous guide vanes and pre-opening guide vanes. A comparison of the CFD results with experimental data shows that in the low flow conditions, centrifugal force and large incident angle cause the formation of large-scale vortex flows inside the runner and between the guide vanes and runner entrance, and that these vortices should be the major factors causing the S-shaped characteristics. Pre-opening of the guide vanes can increase the flow and reduce the vortices in these two flow regions, and thus it is an effective measure for pump-turbine to avoid the mode with S-shaped characteristics.关键词
水力机械/可逆水泵水轮机/"S"特性/同步导叶/预开导叶Key words
hydraulic machinery/ reversible pump turbine/ S-shaped characteristics/ synchronous guide vane/ pre-opening guide vane分类
建筑与水利引用本文复制引用
刘竹青,孙卉,肖若富,刘伟超..水泵水轮机“S”特性及其性能改善[J].水力发电学报,2013,32(2):257-260,270,5.基金项目
国家自然科学基金项目(50809073) （50809073）
