During 1970's, the late professor Thomas E. Sweeney of Princeton University developed his well known Princeton Sailwing Concept aimed toward the wing for subsonic applications as well as wind turbine design. He had also proposed a concept of vertical-axis wind turbine driven by drag/lift force, having rotor of elliptical cross section with fins at both edges. However, he had not been conducted the test on his unique machine, until now, the performance data of Sweeney type vertical-axis wind turbine has not been presented. One of the authors conducted a wind tunnel test of the Sweeney type wind turbine and reported the basic performance of this machine.(Maximum power coefficient C
pmax=0.052 was obtained at tip speed ratio λ=0.4.)
The authors manufactured Twisted-Sweeney type wind turbine, based on Sweeney type wind turbine, to improve the performance and to enhance the beauty of external appearances.
In this research, the authors carried out model tests in a wind tunnel in order to confirm the performance of Sweeney type and Twisted-Sweeney type wind turbines. As a result, the following facts were obtained.
(1) In the case of twisting 90 degrees from the top to the bottom of the Sweeney type wind rotor, the power coefficient of Twisted-Sweeney type wind turbine is increased even at low wind velocity.(Maximum power coefficient C
pmax=0.06 was obtained at tip speed ratio λ =0.35.)
(2) In the case of adding curvature of “S” shape to cross section of the Sweeney type wind rotor, the tip speed ratio and the power coefficient increased, and the operational range of tip speed ratio is widened.(Maximum power coefficient C
pmax=0.1 was obtained at tip speed ratio λ=0.5.)
(3) The maximum power coefficient of Twisted-Sweeney type wind turbine with twist and curvature is about 23 times higher than that of Sweeney type.(Maximum power coefficient C
pmax=0.12 was obtained at tip speed ratio λ =0.5.)
(4) The maximum power coefficient of Twisted-Sweeney type wind turbine with end plates is 1.5 time higher than that without end plates.(Maximum power coefficient C
pmax=0.18 was obtained at tip speed ratio λ=0.75.)
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