Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
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Extreme Design Load Case Analyses of a 5 MW Offshore Wind Turbine Using Unsteady Computational Fluid Dynamics

비정상 CFD 해석기법을 활용한 5 MW 해상풍력터빈 극한 설계하중조건 해석

  • 김동현 (국립경상대학교, 항공우주시스템공학과 및 그린에너지융합 연구소) ;
  • 이장호 (국립경상대학교, 기계항공공학부 대학원) ;
  • 트란탄도안 (국립경상대학교, 기계항공공학부 대학원) ;
  • 곽영섭 (국립경상대학교, 기계항공공학부 대학원) ;
  • 송진섭 (한국기계연구원, 기계시스템 안정성 연구그룹)
  • Received : 2013.09.16
  • Accepted : 2014.06.23
  • Published : 2014.06.30

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Abstract

The structural design of a wind turbine must show the verification of the structural integrity of all load-carrying components. Also, design load calculations shall be performed using appropriate and accurate methods. In this study, advanced numerical approach for the calculation of design loads based on unsteady computational fluid dynamics (CFD) is presented considering extreme design load conditions such as the extreme coherent gust (ECG) and the 50 year extreme operating gust (EOG). Unsteady aerodynamic loads are calculated based on Reynolds average Navier-Stokes (RANS) equations with shear-stress transport k-ω(SST k-ω) turbulent model. A full three-dimensional 5 MW offshore wind-turbine model with rotating blades, hub, nacelle, and tower configuration is practically considered and its aerodynamic interference effect among blades, nacelle, and tower is also accurately considered herein. Calculated blade loads based on unsteady CFD method with respect to blade azimuth angle are compared with those by NREL FAST code and physically investigated in detail.

Keywords

Acknowledgement

본 논문은 2011년도 지식경제부의 재원으로 한국에너지기술평가원(KETEP)의 지원과 한국기계연구원(KIMM)의 위탁연구 지원을 받아 수행한 결과의 일부이며, 지원에 감사를 표하는 바입니다.