摘要
为了探究混流式水轮机改造前后转轮泥沙磨损情况,采用固液两相流模型对某电站改造前后的混流式水轮机进行全流道数值模拟,分析不同工况下转轮叶片表面泥沙分布,转轮叶片表面固液两相速度差,以及水轮机效率。结果表明:小流量工况下泥沙磨损最严重;水轮机改造后,叶片表面泥沙体积分数下降,固液两相速度差减少,泥沙磨损减弱,水轮机效率较改造前提升了5.5%。该研究可为水轮机改造提供一定的参考。
In order to gain the sediment erosion of Francis turbine before and after reformation, full passage numerical simulation of Francis turbine before and after reformation are carried out based on flow model of solid-liquid two-phase. The sediment distributions, velocity difference between solid and liquid phases of runner blade surface and turbine efficiency are analyzed under different operating conditions. The results show that, （a） the most serious sediment erosion occurs under small flow condition; （b） after reformation, the volume fraction of sediment on runner blade surface is decreased, the velocity difference between solid and liquid phases is decreased, the sediment erosion is reduced, and the efficiency of turbine is increased by 5.5%.
出处
《水力发电》
北大核心
2017年第5期73-75,124,共4页
Water Power
基金
国家自然科学基金资助项目(51379179)
西华大学研究生创新基金资助项目(ycjj2016198)
流体及动力机械四川省科技创新研究团队(2011JTD0016)
关键词
泥沙
数值模拟
改造
混流式水轮机
sediment
numerical simulation
reformation
Francis turbine
