抄録
Vertical axial cross flow type of wind turbines by means of the momentum exchange of fluid flow are considered to have superior characters in comparison with the conventional propeller type of HAWT, especially in combined with outer static guide vanes. Expected merits are to operate for all directions of the wind without the mechanism of yaw drive systems, and to have a considerable strong starting torque, which lead to simple structures and low costs. From a view point of above aspect, 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 with max. wind stream velocity 4.5m/s and outlet duct's dia. 0.88mφ. The free stream velocity was regulated from 0.8 to 4.5 m/s by a 1200 mm dia. two blades, propeller driven by a 400 W controlled induction motor. The mechanism of the cross flow model in this experiment are involved the rotor with 0.32mφ dia. and 0.3m wide comprised of flat plate blades and advanced blades modified to attaching the 10mm curved front corner, as a parameter of pitch angle θ_g, θ_r and blade/vane numbers Z_g, Z_r. The aerodynamics characteristics of the turbine obtained by experiment were discussed and correlated by the tip speed ratio and power and torque coefficients C_P, C_q for various parameter combinations.
