阀门开度对余压发电水轮机水力性能的影响研究
Study on the influence of valve opening on hydraulic performance of pressure recovery hydropower turbine
梁武科 1丁科 2李其昌 2董剑1
作者信息
- 1. 西安理工大学水利水电学院,陕西 西安 710048
- 2. 国家电投集团 重庆狮子滩发电有限公司,四川 重庆 401220
- 折叠
摘要
为了研究阀门开度对余压发电水轮机水力性能的影响规律,以肖家河污水处理厂的余压发电水轮机为研究对象,选取3种不同开度的阀门进行对比,采用Ansys CFX软件的standard k-ε湍流模型进行全流道数值模拟,得到阀门开度与余压发电水轮机水力性能之间的关系.结果表明:阀门开度对余压发电水轮机外特性的影响呈非线性关系.阀门开度小于50°时,开度的变化会明显影响水头,但随着开度增加,其影响逐渐降低;流量的增加会导致不同开度下外特性之间的差距扩大.高湍动能区域主要分布在泄水锥与阀门附近,随着流量的增加,余压发电水轮机内阀门附近的高湍动能区域增加,而泄水锥附近的高湍动能区域减少.在相同工况条件下,阀门开度越大,流道内的高湍动能区域越少,而流量增大会增加由阀门开度引起的湍动能特性之间的差异.
Abstract
To investigate the influence of valve opening on the hydraulic performance of a pressure recovery hydropower turbine,the study focused on a pressure recovery hydropower turbine at the Xiaojia River Sewage Treatment Plant.Three valves with different openings were selected for comparison.Numerical simulations of the entire flow passage were conducted using the standard k-ε turbulence model in Ansys CFX software.The study aimed to reveal the relationship between valve opening and the hydraulic performance of the pressure recovery hydropower turbine.The results showed that the effect of valve opening on the external characteristics of the pressure recovery hydropower turbine followed a non-linear relationship.When the valve opening was less than 50°,changes in the opening significantly affected the head,but as the opening increased,the influence gradually decreased.Additionally,an increase in flow rate widened the differences in the external characteristics among different valve openings.The high-turbulence region was mainly distributed near the draft tube and the valve.With an increase in flow rate,the high-turbulence region near the valve of the pressure recovery hydropower turbine expanded,while the high-turbulence region near the draft tube decreased.Under the same operating conditions,a larger valve opening resulted in fewer high-turbulence regions within the flow passage,while an increase in flow rate increased the differences in turbulence characteristics caused by the valve opening.
关键词
阀门开度/余压发电水轮机/水力性能/数值分析Key words
valve opening/pressure recovery hydropower turbine/hydraulic performance/numerical analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据