Numerical simulation of solid-liquid two-phase in tubular turbine
XU Ding′e1, YANG Chunxia1*, CAI Jianguo2, HAN Yang2, GE Xinfeng1
1. College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Chongqing Shipping Construction Development(Group)Co. Ltd., Chongqing 400013, China.
Abstract：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-liquid two-phase flow numerical simulation of the whole passage of the tubular turbine is carried out by using the Euler Lagrange method, the polyhedral grid technology and the realizable k-ε two 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 0.2 mm the maximum wear rate of the end face reaches 0.000 795 kg/(m2·s).The wear area of the guide vane and the tail tube decreased gradually with the increase of sediment diameter. When the sediment diameter is 0.01 mm, the maximum wear rate of the guide vane was 0.004 6 kg/(m2·s), the main wear area is the suction surface of guide vane and the maximum wear rate of tail tube is 0.000 54 kg/(m2·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 0.062 2 kg/(m2·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 5.75 kg/(m2·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.
