Which NACA series is best suitable for Sb-VAWT of 2m dia range? offering offshore operation?

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Alessandro Rizzo

Hello,

For a small offshore 3-straight-blade Vertical Axis Wind Turbine (VAWT) with 2 meters diameter, the NACA 4-digit series airfoils are a popular choice due to their simplicity and ease of manufacturing. Since your application is offshore and is subjected to 6 degrees of motion, you would want an airfoil that has good lift-to-drag ratio (L/D) and is able to operate efficiently at a wide range of angles of attack.

Some commonly used NACA airfoils for VAWTs include:

NACA 0015: This symmetric airfoil has a 15% thickness-to-chord ratio and is known for its good lift-to-drag ratio at low to moderate Reynolds numbers. It's also relatively insensitive to changes in angle of attack, making it suitable for VAWTs.

NACA 0018: Similar to the NACA 0015, the NACA 0018 is symmetric but has an increased thickness-to-chord ratio of 18%. This increased thickness may provide additional structural support for the turbine blades, especially for offshore applications where the forces on the blades could be higher.

NACA 4415 or NACA 4418: These cambered airfoils have a good lift-to-drag ratio and can generate more lift at lower angles of attack compared to symmetric airfoils. The camber can help improve the overall efficiency of the VAWT.

Ultimately, the best airfoil for your specific VAWT depends on various factors such as the desired operating range, Reynolds number, structural requirements, and ease of manufacturing. It is recommended to perform a Computational Fluid Dynamics (CFD) analysis or wind tunnel testing with different airfoils to determine the best option for your specific application.

Manish Bhadra Arnab

The NACA 63-series, in especially the NACA 63-415 or NACA 63-418 airfoils, would be a suitable NACA airfoil series for a 2m diameter VAWT intended for offshore operation as these are frequently employed in applications for small-scale wind turbines and are designed for low Reynolds number flow regimes that are typical of wind turbines with tiny diameters.