Vertical axial cross flow type of wind turbines are considered to have superior characters in comparison with the conventional propeller type of HAWT, especially in combined with outer static guide vanes. One benefit is to operate for all directions of the wind without the mechanism of yaw drive systems, which lead to simple structures and low costs. Others are the safety against the dangerous rotating body and the considerable increasing the output because of having the outer static guide vanes installed, subsequently be suitable for setting to the park/street for small units. In this paper, aerodynamic performance characteristics of the cross flow type of wind turbine combined with outer static guide vanes were studied experimentally by small scale model under the condition of open-type wind tunnel restricted with max wind stream velocity 4.5m/s and outlet duct's dia. 0.88mφ. The free stream velocity at the outlet of the wind tunnel was regulated from 0.8∿4.5m/s by a 1200mm dia. propeller driven by a 400W inverter controlled induction motor. The mechanism of the cross flow model employed in this experiment are involved the rotor with 0.32mφ dia. and 0.3m wide comprised of flat and curved plate blades with pitch angle 60 degree and the number Z=8/16 and the length 1=40∿80mm, and static flat guide vanes with outer and inner dia. 0.64mφ and 0.32mφ, setting angle 30 degree and the number Z=8. The aerodynamics characteristics of the turbine obtained by experiment were discussed, correlated by the tip speed ratio and power and torque coefficients C_p, C_q for various parameter combinations, and cleared to be optimiged design parameters of rotar blades number Z and blade width acting as significant roles.
貫流型風力タービンの空力特性に関する実験的研究
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