【title】：Why use natural laminar flow airfoils in vertical axis wind turbine applications?Why use natural laminar flow airfoils in vertical axis wind turbine applications?
【作者】：Leclerc, Christophe (Ecole Polytechnique, Montreal, Canada)
【Corportate Author】：【Catalog】：7502 Aerodynamics (1975-)|【Keywords】：LAMINAR FLOW AIRFOILS; WIND TURBINES; AERODYNAMIC CHARACTERISTICS; WIND VELOCITY; LIFT; AERODYNAMIC DRAG; ANGLE OF ATTACK; COST REDUCTION【Publish Year】：
【Language】：English【Record id】：97-0005【File Size】：930K
【Come From】：AIAA, Aerospace Sciences Meeting & Exhibit, 35th, Reno, NV, Jan. 6-9, 1997, 10 p..【AAIA ID】：A9715104
【Abstract】：Since the early eighties, Natural Laminar Flow (NLF) airfoils have been preferred to NACA airfoils on Vertical Axis Wind Turbine (VAWT) blades because their use normally lead to a lower Cost Of Energy (COE). ^This paper illustrates and clarifies the relative merits of using NLF airfoils in the design of VAWTs by the application of the double multiple-streamtube model of Paraschivoiu (1988) to the performance predictions of VAWTs equipped with conventional (symmetrical NACA airfoil series) and NLF (SNLA airfoil series of Sandia Laboratories) blades. ^The individual contributions of lift and drag to power are presented so that the aerodynamic efficiency of both types of airfoils may be compared. ^It has been demonstrated that NLF blades are aerodynamically more efficient than conventional blades only in a very low wind speed range, so that the point behind the use of NLF airfoils in VAWT applications is not associated with their low drag characteristics (present only in the very low wind speed range), but rather to their sharp and early stall characteristics, which lead to a relatively flat power curve at high wind speeds. ^(Author)
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