Abstract:The weakly compressible and incompressible fluid flows in the penstock of a pumped storage power station are simulated under the load rejection condition by solving three-dimensional, unsteady and turbulent N-S equations along with an involved time-dependent flow rate subroutine, respectively. A couple of important time-dependent parameters, such as pressure, flow rate in several measurement sections in the penstock, water level in the surge tank, pressure at the penstock outlet as well as flow patterns in the penstock, have been obtained. The predicted transient pressure profiles are compared with the measurements. The pressure given by the weakly compressible fluid model is closer to the experimental data than those obtained by the incompressible fluid model and one-dimensional cha-racteristics method, showing a 0.16% better accuracy and 10.87 m pressure reduction at the penstock outlet. Compared with one-dimensional characteristics method, numerical simulation has more advantages in clarifying flow patterns in a penstock and tracking instantaneous water level in the surge tank. These results may be useful for understanding load rejection condition of hydro-turbine and provide some new ideas for simulating an unsteady flow in pumped storage power stations.
陈世凡, 周大庆, 陈洋. 基于弱可压缩模型的抽蓄电站引水系统数值模拟[J]. 排灌机械工程学报, 2014, 32(9): 765-770.
Chen Shifan, Zhou Daqing, Chen Yang. Numerical simulation of flow in penstock of pumped storage power station based on weakly compressible flow model. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(9): 765-770.
[1]Song C C S, Yuan Mingshun. A weakly compressible flow model and rapid convergence methods[J]. Journal of Fluids Engineering, 1988,110(4):441-445.[2]于波. 弱可压缩流体流动模型及数值求解[J]. 长江科学院院报, 2001,18(1):6-9. Yu Bo. Brief presentation on weakly compressible flow model and its numerical solution[J]. Journal of Yangtze River Scientific Research Institute, 2001,18(1):6-9.(in Chinese).[3]于波,万玉倩,陆宏圻. 基于弱可压缩理论的射流泵流场数值预报[J]. 长江科学院院报, 2003,20(5):12-14,17. Yu Bo, Wan Yuqian, Lu Hongqi. Numerical forecast for jet pump flow based on theory of weakly compressible flow[J]. Journal of Yangtze River Scientific Research Institute, 2003,20(5):12-14,17.(in Chinese)[4]王泽良,陶建华. 水动力学问题的弱可压缩模型求解方法研究[J]. 应用力学学报, 2004,21(1):121-124. Wang Zeliang, Tao Jianhua. Study on the application of weakly compressible N-S equations in solving 3-D hydraulic problems[J]. Chinese Journal of Applied Mechanics, 2004,21(1):121-124.(in Chinese)[5]林明森,陶建华. 三维溃坝问题的数值模拟研究[J]. 水利学报,1996(7):67-74. Lin Mingsen, Tao Jianhua. A study on simulation of 3-D dam-break flow with numecrial method[J]. Journal of Hydraulic Engineering, 1996(7):67-74.(in Chinese)[6]张昌兵,杨永全. 对称型导叶在不同攻角下的水力特性数值分析[J]. 四川大学学报: 工程科学版, 2002,34(6):28-31. Zhang Changbing, Yang Yongquan. Hydraulic characteristic analysis of symmetrical guide blade under diffe-rent attacking angles[J]. Journal of Sichuan University: Engineering Science Edition, 2002,34(6):28-31.(in Chinese)[7]张昌兵. 水力机械叶片尾流机理研究[J]. 四川大学学报: 工程科学版, 2005,37(6):15-19. Zhang Changbing. Research on mechanism of trailing flow for hydrofoils[J]. Journal of Sichuan University: Engineering Science Edition, 2005,37(6):15-19.(in Chinese)[8]Launder B E, Spalding D B. The numerical computation of turbulent flows[J]. Computer Methods in Applied Mechanics and Engineering, 1974,3(2):269-289.[9]何照青,牧振伟,李新,等. 基于VOF模型的倒虹吸进出口流场数值模拟[J]. 中国农村水利水电, 2012(3):94-96. He Zhaoqing, Mu Zhenwei, Li Xin, et al. A numerical simulation of 3-D flow field of inverted siphon import and exports based on VOF method[J]. China Rural Water and Hydropower, 2012(3):94-96.(in Chinese)[10]付亮, 王义国. 有调压井水电站甩负荷试验与仿真分析[J]. 水电能源科学, 2012,30(6):154-157. Fu Liang, Wang Yiguo. Load shedding test and simulation analysis of hydropower station with surge shaft[J]. Water Resources and Power, 2012,30(6):154-157.(in Chinese)[11]张春. 抽水蓄能电站一管多机相继甩负荷过渡过程研究[J]. 水利水电技术, 2011,42(12):66-70,83. Zhang Chun. Study on transition process of load successive rejection of multiple units per penstock in pumped storage hydropower power station[J]. Water Resources and Hydropower Engineering, 2011,42(12):66-70,83.(in Chinese)[12]杨洪涛. 白莲河抽水蓄能电站双机甩负荷试验分析[J]. 水力发电, 2012,38(7):60-63,79. Yang Hongtao. Analysis on double load rejection tests of Bailianhe pumped-torage power station[J]. Water Power, 2012,38(7):60-63,79.(in Chinese)[13]王波. 抽水蓄能电站引水系统过渡过程计算研究[D]. 武汉:华中科技大学水电与数字化工程学院, 2012.