The successful design of an efficient Vertical Axis Wind Turbine (VAWT) can be obtained only when appropriate airfoil sections have been selected. Mach number has been left at the default value of zero.= , Ncrit value is used to model of the turbulence of the fluid or roughness of the airfoil.Ĭurrent repository contains data for average wind tunnel with Ncrit=9 Reynolds number range from 50,000 to 1,000,000 in approximatly logarithmic steps. Systems that operate at the same Reynolds number will have the same flow characteristics even if the fluid, speed and characteristic lengths vary. The Reynolds number is a dimensionless value that measures the ratio of inertial forces to viscous forces and descibes the degree of laminar or turbulent flow. a=1 is the default if no value is given.įor example, the NACA 612-315 a=0.5 has the area of minimum pressure 10% of the chord back, maintains low drag 0.2 above and below the lift coefficient of 0.3, has a maximum thickness of 15% of the chord, and maintains laminar flow over 50% of the chord.
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