水平轴潮流水轮机转轮尾流特性数值分析

针对潮流水轮机转轮尾流对机组之间水力性能的干扰问题，利用CFD分析软件Fluent对单个水平轴潮流水轮机转轮模型和10倍转轮直径间距下的两台机组模型在额定流速条件下进行三维流场的数值模拟。结果表明，在水轮机转轮旋转平面内不同半径位置处的尾流流速恢复情况明显不同，离旋转轴线越远，尾流流速恢复越快，其流速亏损也越少；当水轮机组之间串列布置，且来流方向与旋转平面垂直情况下，下游机组运行受上游机组转轮的尾流影响较大，应尽量避免该布置方式。

Numerical Analysis of Wake Performance of Horizontal axis Tidal Current Turbine

Aiming at the interference of the hydraulic performance between horizontal axis tidal current turbine runners, three dimensional flow fields at the condition of rated flow velocity are numerically simulated by using CFD software FLUENT, which includes single horizontal axis tidal current turbine runner model and two blade runners model spaced between ten times runner diameter. The results show that at different radius position of the turbine runner's rotation plane, the velocity recovery situation of the runner's flow field wake is obviously different; the tidal velocity in the wake recovers quickly at the position farther away from the rotation axis; when turbines are arranged in tandem and the plane of rotation is perpendicular to the flow direction, the downstream unit operation is greatly affected by the flow field of wake of upstream unit runner; so, it should be avoided this arrangement manner.