摘要
为了研究不同泥沙直径对贯流式水轮机全流道磨损情况,基于雷诺时均N-S方程,采用欧拉-拉格朗日法并结合多面体网格技术、Realizable k-εTwo-layer湍流模型对贯流式水轮机全流道进行三维非定常固液两相流数值模拟.结果表明:同一泥沙浓度下随着泥沙直径的增大,进水管道上端面磨损较小而下端面磨损较大,当泥沙直径为0.20 mm时下端面最大磨损率达到0.000795 kg/(m^(2)·s);活动导叶和尾水管磨损区域随着泥沙直径的增大逐渐减小,当泥沙直径为0.01 mm时活动导叶最大磨损率为0.004600 kg/(m^(2)·s),主要磨损区域为导叶吸力面,尾水管最大磨损率为0.000540 kg/(m^(2)·s);转轮最大磨损率随着泥沙直径的增大逐渐变小,当泥沙直径为0.01 mm时,转轮最大磨损率为0.062200 kg/(m^(2)·s),主要磨损区域为叶片出水边和靠近轮毂处.机组在运行过程中,磨损最严重的部件是转轮,当泥沙直径为0.05 mm时,转轮体整体磨损率达到了5.750000 kg/(m^(2)·s),应避免转轮长时间在小直径泥沙下运行,导致磨损加剧.
In order to study the wear of different sediment diameters on the whole channel of the tubular turbine,based on the Reynolds time averaged N-S equation,three-dimensional unsteady solid-li-quid two-phase flow numerical simulation of the whole passage of the tubular turbine was carried out by using the Euler-Lagrange method,the polyhedral grid technology and the realizable k-εtwo layer turbulence model.The results show that with the increase of sediment diameter at the same sediment concentration in the inlet section,the wear of upper end face of the inlet pipe is smaller,while the wear of the lower end faceis larger.When the sediment diameter is 0.20 mm,the maximum wear rate of the end face reaches 0.000795 kg/(m^(2)·s).The wear area of the guide vane and the tail tube decreases gradually with the increase of sediment diameter.When the sediment diameter is 0.01 mm,the maximum wear rate of the guide vane is 0.004600 kg/(m^(2)·s),the main wear area is the suction surface of guide vane and the maximum wear rate of tail tube is 0.000540 kg/(m^(2)·s).When the sediment diameter is 0.01 mm,the maximum wear rate of runner decreases with the increase of sediment particle diameter,the maximum wear rate of runner is 0.062200 kg/(m^(2)·s)and the main wear areas are the blade outlet and near the hub.When the sediment diameter is 0.05 mm,the overall wear rate of the runner body reaches 5.750000 kg/(m^(2)·s).The most worn component of the unit during operation is the runner,it should be avoided that the runner runs under the sediment of small diameter for a long time,which result in increased wear.
作者
徐顶娥
杨春霞
蔡建国
韩洋
葛新峰
XU Ding′e;YANG Chunxia;CAI Jianguo;HAN Yang;GE Xinfeng(College of Energy and Electrical Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Chongqing Shipping Construction Development(Group)Co.Ltd.,Chongqing 400013,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2021年第9期910-916,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51709086).
关键词
贯流式水轮机
泥沙直径
磨损
固液两相
数值模拟
tubular turbine
sediment diameter
wear
solid-liquid two-phase
numerical simulation
