7/10/2023 0 Comments Pc airfoils![]() The blade set design began with more » the definition of a family of three approximately 50% chord NLF sections (15, 18, and 21% t/c). This paper describes the design of this blade set. Sandia National Laboratories (SNL) is now in the process of procuring a blade set for its 17-m-diameter research turbine which will use NLF sections as blade elements. Studies have shown that vertical-axis wind turbines (VAWTs) using NLF sections as blade elements have the potential of producing energy at a significantly lower cost (approx. Natural laminar-flow (NLF) airfoils are those which can achieve significant extents of laminar flow (greater than or equal to 30% chord) solely through favorable pressure gradients. ![]() SNL has demonstrated this concept on its 5-m turbine and has wind tunnel tested perforation geometries on one NLF section. With the addition of small perforations in the surface of the blades and valves controlled by windspeed at the ends of each blade, lift spoiling jets may be generated inducing premature stall and permitting lower capacity, lower cost drivetrain components. more » Pumped spoiling utilizes the centrifugal pumping capabilities of hollow blades. With approximately 12% of span having VGs, annual energy production increased by 5%. Vane-type VGs were fitted on one DOE/Alcoa 100 kW VAWT. Increases in peak efficiency and more desirable dynamic stall regulation characteristics have been observed. One section is presently being run on the SNL 17-m turbine. ![]() Sandia National Laboratories (SNL) has taken three airfoil related approaches to decreasing the cost of energy of vertical axis wind turbine (VAWT) systems airfoil sections designed specifically for VAWTs, vortex generators (VGs), and ''pumped spoiling.'' SNL's blade element airfoil section design effort has led to three promising natural laminar flow (NLF) sections. ![]()
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