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Wind tunnel test results for a 2/4.5 scale MEXICO rotor

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  • Cho, Taehwan
  • Kim, Cheolwan

Abstract

This paper presents the wind tunnel test results from MEXNEXT, an IEA wind task for analyzing the measurements which have been taken in the EU project ‘MEXICO’. A 2/4.5 scaled model of ‘MEXICO’ rotor was tested in the KARI low wind tunnel with 5 × 3.75 m2 open jet test section. The aerodynamic performance of the blade which was represented by the torque was measured in the wind speed from 0 to 30 m/s by using the torque sensor installed in the rotating axis. The rotational speed of the rotor was controlled by the electric motor to keep the prescribed blade tip speed from 50 m/s to 90 m/s. Two different surface conditions, free and forced transition conditions were used for all blade tip speeds. Transition dots with 0.18 mm height were attached at the 5% chord line on both sides of the blade surface for the forced transition condition. The torque coefficients with respect to the wind speed coefficient for the forced transition condition show same characteristics for all blade tip speed conditions except for the stall region. But, the torque coefficient for the free transition condition gradually increases as the blade tip speed increases until the tip speed reaches 76 m/s and it has the similar value above that speed. The comparison result between the free and the forced transition conditions at the blade tip speed 76 m/s shows that the torque coefficient for the former case is 30% higher than the latter case. The computational results from ‘Rfoil’ and the BEMT method also shows that the aerodynamic performance of the rotor for the forced transition condition is lower than the free transition one at the wind tunnel test condition.

Suggested Citation

  • Cho, Taehwan & Kim, Cheolwan, 2012. "Wind tunnel test results for a 2/4.5 scale MEXICO rotor," Renewable Energy, Elsevier, vol. 42(C), pages 152-156.
    • Handle: RePEc:eee:renene:v:42:y:2012:i:c:p:152-156
    DOI: 10.1016/j.renene.2011.08.031
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    Citations

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    Cited by:

    1. Li, B. & Zhou, D.L. & Wang, Y. & Shuai, Y. & Liu, Q.Z. & Cai, W.H., 2020. "The design of a small lab-scale wind turbine model with high performance similarity to its utility-scale prototype," Renewable Energy, Elsevier, vol. 149(C), pages 435-444.
    2. Wang, Ying & Li, Gaohui & Shen, Sheng & Huang, Diangui & Zheng, Zhongquan, 2018. "Investigation on aerodynamic performance of horizontal axis wind turbine by setting micro-cylinder in front of the blade leading edge," Energy, Elsevier, vol. 143(C), pages 1107-1124.
    3. J. G. Schepers & S. J. Schreck, 2019. "Aerodynamic measurements on wind turbines," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 8(1), January.
    4. Yan, Chi & Archer, Cristina L., 2018. "Assessing compressibility effects on the performance of large horizontal-axis wind turbines," Applied Energy, Elsevier, vol. 212(C), pages 33-45.
    5. Cho, Taehwan & Kim, Cheolwan, 2014. "Wind tunnel test for the NREL phase VI rotor with 2 m diameter," Renewable Energy, Elsevier, vol. 65(C), pages 265-274.
    6. Bai, Chi-Jeng & Wang, Wei-Cheng, 2016. "Review of computational and experimental approaches to analysis of aerodynamic performance in horizontal-axis wind turbines (HAWTs)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 63(C), pages 506-519.
    7. Yao, Shulong & Griffith, D. Todd & Chetan, Mayank & Bay, Christopher J. & Damiani, Rick & Kaminski, Meghan & Loth, Eric, 2020. "A gravo-aeroelastically scaled wind turbine rotor at field-prototype scale with strict structural requirements," Renewable Energy, Elsevier, vol. 156(C), pages 535-547.

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