摘要
建立国内某冲击式电站的配水环管、喷针及折向器模型,采用水-气两相模型进行了非定常计算,利用动网格方法研究过渡过程中六喷嘴配水环管产生的流速及压力的动态变化.结果发现:配水环管在关闭过程中,岔管的压力变化仅在进口段管道单纯上升,在进口段后的所有点压力分布遵循同样的规律;动作开始时出现压力下降趋势,之后会出现凸字型的压力变化,在开度关闭至0.5时会出现持续的高频波动,在开度0.375附近会达到压力上升的第一个峰值,在开度达到0.19附近会达到第二个峰值;三维过渡过程计算结果与一维计算方法在压力分布规律上一致.
A model of the water distribution loop,nozzle,and deflector for a certain impact power plant in China was established.Unsteady calculations were conducted using a water gas two-phase model.The dynamic grid method was used to study the dynamic changes in flow velocity and pressure generated by the six nozzle water distribution loop during the transition process.Research had found that during the closing process of the water distribution ring pipe,the pressure change of the bifurcated pipe only increases in the inlet section of the pipeline,and the pressure distribution at all points after the inlet section follows the same pattern.At the beginning of the action,there is a pressure decrease trend,followed by a convex shaped pressure change rule.When the opening is closed to 0.5,there will be continuous high-frequency fluctuations,and when the opening is around 0.375,the first peak of pressure rise will be reached.When the opening reaches around 0.19,the second peak will be reached.The calculation results of the threedimensional transition process are consistent with the pressure distribution law of the one-dimensional calculation method.
作者
葛新峰
孟涵
邓朝钟
曹林宁
GE Xinfeng;MENG Han;DENG Chaozhong;CAO Linning(College of Energy and Electrical Engneering,Hohai University,Nanjing 210098,China;Sichuan Water Development Investigation Design and Research Co.Ltd.,Chengdu 610015,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期20-26,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金面上项目(52279083)。
关键词
冲击式水轮机
配水环管
过渡过程
动网格
水-气两相流数值模拟
impulse turbine
water distribution ring pipe
transition ring pipe
dynamic grid
numerical simulation of water-gas and two-phase flow
