Aiming to explore the array characteristics of twin units and realize the efficient utilization of this type of turbine,a three-dimensional numerical simulation study on the different arrangement and spacing of twin unit arrays was carried out using the computational fluid dynamics method.The results show that in a parallel arrangement,both units will achieve higher performance indicators than that of a single unit,and the gain effect of the hydrodynamic interaction between the two units will gradually de-crease with the increase of parallel spacing after reaching the peak.Besides,the tip vortices of the two units in the reverse rotation setting will have a gear-like meshing effect,while the tip vortices of the two units in the co-rotation setting collide with each other and are intertwined,leading to a premature breaking of one unit in the process of vortices development.On the other hand,the performance of the upstream units is basically unaffected when the tandem spacing is greater than 5D,while the perfor-mance of the downstream units decreases significantly with the decrease of tandem spacing in the tan-dem arrangement.The vortices of the downstream units in reverse rotation setting are relatively disor-dered,while the downstream units in the co-rotation setting almost perfectly integrate with the upstream vortices,and its wake is more like an extension and inheritance of the upstream vortices.The research results provide certain reference strategies for the optimal arrangements of Archimedes spiral hydroki-netic turbines.
关键词
阿基米德螺旋水轮机/双机组阵列/水动力性能/尾流特性/计算流体力学
Key words
Archimedes spiral hydrokinetic turbine/twin units array/hydrodynamic performance/wake characteristics/computational fluid dynamics
维普
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