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Experimental investigation of unsteady wake behind a section of a wind turbine blade

Soltani, M.R ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. Publisher: 2007
  3. Abstract:
  4. A series of experiments were carried out to study the unsteady wake phenomenon behind an oscillating airfoil. The airfoil is a section of a wind turbine blade oscillating in pitch about the quarter chord axis at various reduced frequencies, oscillation amplitude and mean angles of attack. Streamwise velocity profiles were obtained by real time and instantaneous measurements at 35 vertically aligned points behind the airfoil via two similar rakes. One of rakes has only static pressure probes and the other is equipped with total pressure ones. An estimation of the variation of linear momentum defect during the oscillation is obtained and has been compared with the corresponding static one. The results show great influence of the flow field history on the wake characteristics. Furthermore, the effects of oscillation amplitude and reduced frequency are discussed
  5. Keywords:
  6. Linear momentum ; Static pressure probes ; Velocity profiles ; Airfoils ; Angle measurement ; Flow fields ; Turbomachine blades ; Unsteady flow ; Wind turbines ; Wakes
  7. Source: 25th AIAA Applied Aerodynamics Conference, 2007, Miami, FL, 25 June 2007 through 28 June 2007 ; Volume 2 , 2007 , Pages 870-876 ; 10485953 (ISSN) ; 1563478986 (ISBN); 9781563478987 (ISBN)