Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Dynamic analysis of wind turbine wake

풍력 발전 터빈 후류의 동적 분석

  • Um, Young Han (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Kim, Yun Gu (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Park, Sung Goon (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • Received : 2020.07.30
  • Accepted : 2020.08.27
  • Published : 2020.08.31
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Abstract

Vertical axis wind energy systems including 3 and 4 blades are numerically investigated in a two-dimensional (2D) computational domain. The power coefficient (Cp) is adopted to measure the efficiency of the system and the effect of the rotating velocity on the power coefficient is analyzed for the two different systems. The rotating velocity varies from 30 rad/s to 90 rad/s, which corresponds to the tip speed ratio (T.S.R) of 0.5 to 1.5. The torque exerted on the blades is mainly determined by the aerodynamic force in the x-direction and maximized when the blade is positioned at around θ = 186°. The efficiency of the 4-blade system is higher than that of the 3-blade system within the tip speed ratio range between 0.5 and 0.67, besides where the 3-blade system shows a better performance. For the 3-blade system, the maximum efficiency is reached to 0.082 at the tip speed ratio of 1.083. The maximum efficiency of the 4-blade system is 0.071 at T.S.R. = 0.92. The velocity fields in the x-direction, pressure fields, and the vorticity magnitude are analyzed in detail for the optimal cases of the 3- and 4-blades systems, respectively.

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References

  1. Meldrum, J., Nettles-Anderson, S., Heath, G., Macknick, J., 2013, "Life cycle water use for electricity generation: a review and harmonization of literature estimates," Environment Research Letters, 8(1).
  2. Weisser, D., 2007, "A guide to life-cycle greenhouse gas (GHG) emissions from electric supply technologies," Energy, 32(9), 1543-1559. https://doi.org/10.1016/j.energy.2007.01.008
  3. Lee, Y. T., Lim, H. C., 2013, "Flow Characteristics around Vertical Axis Darrius Blades," The Korean Society of Mechanical Engineers., pp 1205-1210.
  4. Jeong, K. L., Lee, Y. G., Ha, Y. J., Kang, B. H., Kang, D. S., 2013, "A Fundamental Study on the Vertical-Axis Wind Turbine for Fishing Boat using Numerical Analysis," Journal of the Society of Naval Architects of Korea., Vol. 50(6), pp 356 - 372.
  5. Jung, H. Y., Lee, Y. W., Kim, Y. D., 2008, "Numerical Study on the Starting Characteristics of Vertical Axis Wind Turbine," The Korean Society of Marine Engineering., pp 297-298.
  6. Heo, Y. G., Choi, K. H., Kim, K. C., 2016, "CFD and experiment validation on aerodynamic power output of small VAWT with low tip speed ratio," Journal of the Society of Marine Engineering., Vol. 40(4), pp 330 - 335.