Abstract
The self-rectified air turbine for wave power convertors, the so-called wells turbine, has been fundamentally studied by many research groups, who found that there exists a big difference between then of stall angle on rotor blades even if they employ almost identical rotors in their own facilities. This research reveals that the difference is caused by the tip clearance which induces the tip vortices so as to prevent the flow separation on the rotor blade. The bigger the tip clearance is, the bigger the stall angle becomes, which results in the operational region in the sea being extended. . Furthermore, the performance is improved even in the stall region, making the self-starting of the turbine easy, although the maximum efficiency is decreased owing to the leakage loss. The influences of another factors on the performance, that is, the boundary layer of the casing and the intensity of turbulence at the inlet, are much smaller than that given by the tip clearance. It is now possible to compare the experimental results between research groups as far as they use the same clearances.
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