Dynamic Stall on Wind Turbine Blades

David Simms

Research output: NRELTechnical Report


Dynamic loads must be predicted accurately in order to estimate the fatigue life of wind turbines operating in turbulent environments. Dynamic stall contributes to increased dynamic loads during normal operation of all types of horizontal-axis wind turbines (HAWTs). This reports illustrates how dynamic stall varies throughout the blade span of a 10 m HAWT during yawed and unyawed operatingconditions. Lift, drag, and pitching moment coefficients during dynamic stall are discussed. Resulting dynamic loads are presented, and the effects of dynamic stall on yaw loads are demonstrated using a yaw loads dynamic analysis (YAWDYN).
Original languageAmerican English
Number of pages9
StatePublished - 1991

NREL Publication Number

  • NREL/TP-257-4510


  • blades
  • dymamic loads
  • dynamic stall
  • wind turbines


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