{"title":"Power Performance Improvement of 500W Vertical Axis Wind Turbine with Salient Design Parameters","authors":"Young-Tae Lee, Hee-Chang Lim","volume":109,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":84,"pagesEnd":89,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10003393","abstract":"This paper presents the performance characteristics of
\r\nDarrieus-type vertical axis wind turbine (VAWT) with NACA airfoil
\r\nblades. The performance of Darrieus-type VAWT can be
\r\ncharacterized by torque and power. There are various parameters
\r\naffecting the performance such as chord length, helical angle, pitch
\r\nangle and rotor diameter. To estimate the optimum shape of Darrieustype
\r\nwind turbine in accordance with various design parameters, we
\r\nexamined aerodynamic characteristics and separated flow occurring
\r\nin the vicinity of blade, interaction between flow and blade, and
\r\ntorque and power characteristics derived from it. For flow analysis,
\r\nflow variations were investigated based on the unsteady RANS
\r\n(Reynolds-averaged Navier-Stokes) equation. Sliding mesh algorithm
\r\nwas employed in order to consider rotational effect of blade. To
\r\nobtain more realistic results we conducted experiment and numerical
\r\nanalysis at the same time for three-dimensional shape. In addition,
\r\nseveral parameters (chord length, rotor diameter, pitch angle, and
\r\nhelical angle) were considered to find out optimum shape design and
\r\ncharacteristics of interaction with ambient flow. Since the NACA
\r\nairfoil used in this study showed significant changes in magnitude of
\r\nlift and drag depending on an angle of attack, the rotor with low drag,
\r\nlong cord length and short diameter shows high power coefficient in
\r\nlow tip speed ratio (TSR) range. On the contrary, in high TSR range,
\r\ndrag becomes high. Hence, the short-chord and long-diameter rotor
\r\nproduces high power coefficient. When a pitch angle at which airfoil
\r\ndirects toward inside equals to -2° and helical angle equals to 0°,
\r\nDarrieus-type VAWT generates maximum power.","references":"[1] IEA report (2012). World Energy Outlook 2012 \u2013 Renewable Energy\r\nOutlook (Chapter 7). International Energy Agency.\r\n[2] Gorelov, D. N. (2010). Energy characteristics of Darrieus rotor (review).\r\nThermophysics and Aeromechanics, 17-3, p301-308.\r\n[3] Paraschivoiu, I., Trifu, O., Saeed, F. (2009). H-DarrieusWind Turbine\r\nwith Blade Pitch Control. International Journal of Rotating Machinery,\r\n2009-505343, p1-7.\r\n[4] Fujisawa, N., Shibuya, S. (2001). Observations of dynamic stall on\r\nDarrieus wind turbine blades. Journal of Wind Engineering and\r\nIndustrial Aerodynamics, 89-2, p201-214.\r\n[5] Ferreira, C.J.S. (2009). The near wake of the VAWT. 2D and 3D views\r\nof the VAWT aerodynamics, Ph.D. Thesis, Delft University of\r\nTechnology.\r\n[6] Maitre, T., Achard, J.L., Guitet, L., and Ploesteanu, C. (2005). Marine\r\nturbine development: numerical and experimental investigations. Sci.\r\nBull. Timisoara Politechnic Univ., 50, p59-66.\r\n[7] Howell, R., Qin, N., Edwards, J., Durrani,, N. (2010). Wind tunnel and\r\nnumerical study of a small vertical axis wind turbine. Renewable\r\nEnergy, 35, p412-422.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 109, 2016"}