Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines | Zendy

R.E. Sheldahl | Zendy; P.C. Klimas | Zendy

Open Access

Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines

Author(s) -

R.E. Sheldahl,

P.C. Klimas

Publication year - 1981

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/6548367

Subject(s) - airfoil , naca airfoil , aerodynamics , angle of attack , pitching moment , aerospace engineering , relative wind , wind tunnel , turbine , physics , wind power , structural engineering , engineering , reynolds number , meteorology , turbulence , electrical engineering

When work began on the Darrieus vertical axis wind turbine (VAWT) program at Sandia National Laboratories, it was recognized that there was a paucity of symmetrical airfoil data needed to describe the aerodynamics of turbine blades. Curved-bladed Darrieus turbines operate at local Reynolds numbers (Re) and angles of attack (a) seldom encountered in aeronautical applications. This report describes (1) a wind tunnel test series conducted at moderate values of Re in which O < a ~ 180° force and moment data were obtained for four symmetrical blade-candidate airfoil sections (NACA-0009, -0012, -0012H, and -0015), and (2) how an airfoil property synthesizer code can be used to extend the measured , properties to arbitrary values of Re (l@ = Re < 107) and to certain other section profiles (NACA-0018, -0021, -0025).

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