1. College of Water Conservancy and Hydropower, Hohai University, Nanjing, Jiangsu 210098, China; 2. Innovation Research Institute, Hehai University, Nanjing, Jiangsu 210098, China; 3. East China Survey and Design Research Institute, Hangzhou, Zhejiang 311100, China
Abstract:In order to study the stability of the reverse power generation of a pumping station unit in the East Route of the South to North Water Diversion Project, the full numerical simulation of the flow channel was carried out to study the pressure fluctuation and stress distribution in the reverse power generation. Monitoring points in three sections of guide vane inlet, runner inlet and outlet were set up. The results show that the time domain diagram of pressure pulsation at the inlet and outlet of the inlet of the axial flow pump shows periodic variation under the reverse generating condition. The frequency of pressure pulsation is influenced by the frequency of runner and concentrated at low frequency. The flow pressure fluctuating in the middle and edge of the inlet of the runner is obvious. The maximum pressure pulsation occurs at the middle of the runner outlet. The amplitude of the pressure pulsation is nearly 3 times the outlet edge of the runner, and it is nearly 2 times the middle and edge of the inlet of the runner. At the impeller outlet, the pressure pulsation increases from hub to rim. The results of fluid solid coupling show that the total deformation of the blade is mainly distributed in the inlet side of the blade, and the deformation increases gradually along the wheel hub to the wheel edge, and the stress mainly concentrates on the blade pressure surface and the root of the suction surface, and the maximum equi-valent stress appears at the impeller root of the suction surface of the blade. The maximum equivalent stress value does not affect the life and damage of the runner unit in the safety range of blade material.
[1]戴启璠,王宏图,杨燕, 等.淮阴抽水站可逆式轴流泵装置性能研究[J].水电能源科学,2017(11):170-174. DAI Qifan, WANG Hongtu, YANG Yan,et al. Study on the performance of reversible axial flow pump unit in Huaiyin pumping station [J].Water resources and power,2017(11):170-174.(in Chinese)[2]汤方平, 张丽萍, 付建国,等. 轴流泵内部压力脉动数值预测及分析[J]. 排灌机械工程学报, 2013, 31(10):835-840. TANG Fangping, ZHANG Liping, FU Jianguo,et al. Prediction and numerical analysis for pressure fluctua-tion of axial-flow pump[J]. Journal of drainage and irrigation machinery engineering, 2013, 31(10):835-840.(in Chinese)[3]赵浩儒,杨帆,吴俊欣,等.立式轴流泵装置压力脉动特性的试验[J].流体机械,2017,45(7):12-16. ZHAO Haoru, YANG Fan, WU Junxin, et al. Test on pressure pulsation characteristics of vertical axial flow pump[J] Fluid machinery,2017,45(7):12-16.(in Chinese)[4]郑源,陈宇杰,张睿,等. 轴流泵失速工况下非定常流动特性研究[J]. 农业机械学报,2017, 48(7):127-135. ZHENG Yuan, CHEN Yujie, ZHANG Rui, et al. Analysis on unsteady stall flow characteristics of axial-flow pump[J]. Transactions of the CSAM, 2017, 48(7): 127-135.(in Chinese)[5]董兴华,郭艳磊,毕祯,等.基于CFX与Workbench耦合的轴流泵的内外特性[J]. 排灌机械工程学报, 2015,46(6):488-493. DONG Xinghua, GUO Yanlei, BI Zhen, et al. Internal and external characteristics of axial flow pump based on CFX and Workbench coupling [J] Journal of drainage and irrigation machinery engineering, 2015,46(6):488-493.(in Chinese)[6]程效锐,魏彦强,刘贺, 等. 核主泵叶轮与导叶能量转换的数值计算[J]. 流体机械, 2018, 46(9):46-51. CHENG Xiaorui,Wei Yanqiang,LIU He,et al. Nume-rical calculation of energy conversion with impeller and guide vanes of a nuclear main pump [J].Fluid machine-ry, 2018, 46(9):46-51.(in Chinese)[7]WEI H,WEI J,SHU G. Calculation on cylinder pressure fluctuation by using the wave equation in KIVA program[J]. Chinese journal of mechanical engineering,2012,25(2):362-369.[8]LI D Y,GONG R Z,WANG H J,et al. Dynamic analysis on pressure fluctuation in vaneless region of a pump turbine[J]. Science China technological sciences, 2015, 58(5):813-824. [9]LI P,ZHANG Y T,XIE L Z,et al. Elimination of fuel pressure fluctuation and multi-injection fuel mass deviation of high pressure common-rail fuel injection system[J]. Chinese journal of mechanical engineering, 2015,28(2):294-306.[10]张宁波, 汪建晓, 张立平. 空调室外机管路系统的模态仿真分析[J]. 流体机械, 2017,45(2):71-74. ZHANG Ningbo,WANG Jianxiao,ZHANG Liping. The air conditioner outdoor unit modal simulation analysis of piping system[J]. Fluid machinery, 2017,45(2):71-74.(in Chinese)[11]LIU SH,SHAO J,WU SF,et al. Numerical simulation of pressure fluctuation in Kaplan turbine[J].Science in China, 2008,51(8):1137-1148.[12]ZHAO Y,PENG Q,WAN W,et al.Fluid-solid coupling analysis of rock pillar stability for concealed karst cave ahead of a roadway based on catastrophic theory[J]. International journal of mining science and technology,2014,24(6):737-745.[13]GU C S,WEI B W,XU Z K,et al. Fluid solid coupling model based on endochronic damage for roller compacted concrete dam[J].Journal of Central South University,2013,20(11):3247-3255.[14]CHENG Y F,LI L D,MAHMOOD S,et al. Fluid-solid coupling model for studying wellbore instability in drilling of gas hydrate bearing sediments[J]. Applied mathematics and mechanics,2013,34(11):1421-1432.