Blade Design Trade-Offs Using Low-Lift Airfoils for Stall-Regulated HAWTS

Research output: Contribution to conferencePaper


A systematic blade design study was conducted to explore the trade-offs in using low-lift airfoils for a 750-kilowatt stall-regulated wind turbine. Tip-region airfoils having a maximum lift coefficient ranging from 0.7-1.2 were considered in this study, with the main objective of identifying the practical lower limit for the maximum lift coefficient. Blades were optimized for both maximum annualenergy production and minimum cost of energy using a method that takes into account aerodynamic and structural considerations. The results indicate that reducing the maximum life coefficient below the upper limit considered in this study increases the cost of energy independently of the wind regime. As a consequence, higher maximum lift coefficient airfoils for the tip-region of the blade becomemore desireable as machine size increases, as long as they provide gentle stall characteristics. The conclusions are applicable to large wind turbines that use passive or active stall to regulate peak power.
Original languageAmerican English
Number of pages14
StatePublished - 1999
EventAIAA/ASME Wind Energy Symposium - Reno, Nevada
Duration: 11 Jan 199914 Jan 1999


ConferenceAIAA/ASME Wind Energy Symposium
CityReno, Nevada

NREL Publication Number

  • NREL/CP-500-26091


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