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

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

Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines   (Citations: 17)
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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 (..cap alpha..) seldom encountered in aeronautical applications. This report describes (1) a wind tunnel test series conducted at moderate values of Re in which 0 less than or equal to ..cap alpha.. less than or equal to 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 (10⁴ less than or equal to Re less than or equal to 10⁷) and to certain other section profiles (NACA-0018, -0021, -0025).
Published in 1981.
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    • ...In the examples, a Reynolds number (Re) of 5 × 106 was used, which was consistent with the experiment (Sheldahl and Klimas 1981) with U = 38...

    Yuguang Baiet al. Numerical aerodynamic simulations of a NACA airfoil using CFD with blo...

    • ...To visualize these trends effect on lift-to-drag ratio and also compare predicted results with their experimental counterparts available in [16], Fig. 1 is presented for NACA 0015 airfoil at Reynolds number of 80000...

    Reza Chiniet al. Blades optimization for an ocean current horizontal axis turbine using...

    • ...Figure 2 presents the dependence of CL on a and Rec, along with some published data at Rec = 3.6 9 10 5 and 7.6 9 10 5 measured by Sheldahl and Klimas (1981 )a nd...

    Y. Zhouet al. The ultra-low Reynolds number airfoil wake

    • ...The experimental values are taken from [13], while Newtonian approximated model is described for example in [15]...
    • ...Typical behaviors of the lift and drag coefficients as functions of the angle of attack are shown in Figure 2 obtained from the experimental data presented in [13]...
    • ...By using the expressions (3) and the lift and drag coefficients in [13] the regions depicted in Figure 3 for different values of � have been obtained...
    • ...By using the value of ¯ α� computed from the coefficients in [13], the system’s parameters in [10] as the minimum velocity at which the lift force is still able to counteract a fraction of the gravity force, i.e...
    • ...¯ α� ≈ 0.2 rad for the airfoil considered in [13]) and, in turn, cos α ≈ 1 and sin α ≈ α, we rewrite (29) as...

    Roberto Naldiet al. On robust transition maneuvers for a class of tail-sitter vehicles

    • ...The experimental values are taken from [13], while Newtonian approximated model is described for example in [14]...

    Roberto Naldiet al. Minimum time trajectories for a class of V/STOL aircrafts

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