摘要
含沙水流会对高水头水斗式水轮机转轮造成磨损,影响机组检修和高效安全运行。文采用流体体积模型(volume of fluid,VOF)、SST k-w湍流模型和离散相模型(discrete phase model,DPM)对含沙水流进行了固–液–气三相非定常数值模拟,研究了泥沙颗粒的直径、浓度与斗叶内表面磨损量、磨损位置的关系。研究表明:随着射流能量的传递,水膜的高压力区逐渐从缺口后移到斗叶根部;分水刃和缺口位置是最容易受到泥沙磨损的部位,与现场电站转轮水斗磨损位置一致;泥沙直径、浓度的增加与磨损率呈正相关;小颗粒泥沙更易对靠近斗叶根部的出水边造成磨损,而大颗粒泥沙更易对靠近分水刃的进水边造成磨损。本文研究的目的是为水斗式水轮机的制造加工、维护检修提供一定的理论基础。
Sand-laden flow causes hydro-abrasive erosion on the Pelton turbine bucket of high head, which affects the maintenance and safe operation of the hydropower station. In this paper, the volume of fluid(VOF) multiphase model, SST k-ω turbulence model, and discrete phase model(DPM) was used to simulate the solid-liquid-gas three-phase unsteady flow. The relationship between sediment particles(size and concentration) and erosion phenomenon(erosion rate and position) on buckets was studied. The study shows that, with the transfer of jet energy, the high-pressure area on the inner surface gradually moves from the cut-out to the root of the bucket. The cut-out and splitter were the major eroded parts. The increase of sediment size and concentration was positively correlated with the hydro-abrasive erosion loss. Small sediment particles were more likely to erode to the outlet zone near the bucket root, while large sediment particles were more likely to erode to the inlet zone near the splitter. This study could provide some theoretical basis for the manufacturing, maintenance, and overhaul of the Pelton turbine.
作者
葛新峰
孙洁
李阳
张雷
邓朝钟
王金亮
高飞
丁铭泉
郑源
GE Xinfeng;SUN Jie;LI Yang;ZHANG Lei;DENG Chaozhong;WANG Jinliang;GAO Fei;DING Mingquan;ZHENG Yuan(College of Energy and Electric engineering,Hohai University,Nanjing 210098,Jiangsu Province,China;Jiangsu Institute of Technology,Changzhou 213001,Jiangsu Province,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,Henan Province,China;Huanghe Wanjiazhai Hydro Junction Co.,Ltd.,Xinzhou 036412,Shanxi Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第14期5025-5033,共9页
Proceedings of the CSEE
基金
国家自然科学基金面上项目(51579080)
中央高校基本科研业务费(2015B02814)。
