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The installation of diffuser is an important way to improve the efficiency of tidal turbines, which is promising for engineering practice. In this paper, the open source code OpenFOAM is used as the platform. Numerical simulations are carried out to investigate the influence of the performance of the diffuser for the vertical axis tidal turbines. Several different types of diffusers are designed by distinguishing the line shape. Through systematic simulations, the influence of inlet line shape on the hydrodynamics performances of tidal energy diffuser is summarized. The velocity field, pressure field, etc. are analyzed to recover the flow modifications induced by the diffuser. The best line shape is finally found which can optimize the harnessing efficiency of the tidal turbine, which provides important clues for the development of tidal energy devices.

Influence of inlet line shape on hydrodynamic performance of tidal energy diffuser