Abstract
The half-rotating impeller tidal turbine (HRITT) is a new type of vertical shaft tidal current turbine with lift and resistance performance. In order to explore the hydrodynamic characteristics of HRITT, the CFD method was used to analyze its flow field characteristics and dynamic performance. XFlow software was used to analyze the variation of velocity, vorticity, pressure and wake in the flow field of the half-rotating impeller, and the flow field characteristics of the device were expounded. The distribution of wake vortices and the attenuation law of wake velocity in a half-rotating impeller were analyzed, and the arrangement distance between the front and rear units was explored. According to the characteristics of the flow field, the variation law of torque coefficient and water utilization ratio were analysed. It was found that the maximum water utilization ratio of HRITT is 34.7%, and the fluctuation of torque coefficient is small. The above results show that HRITT has unique flow field characteristics and good dynamic characteristics.
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