Load equivalent tower shadow modeling for downwind turbines

Shigeo Yoshida, Soichiro Kiyoki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


BEM (Blade Element and Momentum) theory is useful for load calculation of wind turbines, as hundreds of load cases must be calculated for aero-elastic models with controllers considered. Modeling of tower shadow effects is essential for design of downwind turbines, which are promising in complex terrains. Present study proposes a new modeling method for tower shadow effects on the basis of load equivalence. It considers aerodynamic interaction between rotor and tower and transient passing through tower wake. Those phenomena were ignored in former modeling, which are defined on the basis of wind speed profile behind isolated tower. Load equivalent model of SUBARU 80/2.0 2 MW downwind turbine was defined based on load transients calculated by wind turbine CFD in operating condition. The model was verified through field tests. Furthermore, a case study made clear that former models provide 10-30% larger fatigue loads than the present proposed load equivalent model. Present method makes downwind turbines competitive to upwind turbines.

Original languageEnglish
Pages (from-to)1273-1279
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number6
Publication statusPublished - Jun 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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