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CFD Simulations of Tiltrotor Configurations in Hover

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Navier‐Stokes computational fluid dynamics calculations are presented for isolated, half‐span, and full‐span V‐22 tiltrotor hover configurations. These computational results extend the validity of CFD hover methodology beyond conventional applications to tiltrotor configurations. Computed steady‐state, isolated rotor performance agrees well with experimental measurements, showing little sensitivity to grid resolution. However, blade‐vortex interaction flowfield details are sensitive to numerical dissipation and are more difficult to model accurately. Time‐dependent, dynamic, half‐ and full‐span installed configurations show sensitivities in performance to the tiltrotor fountain flow. As such, the full‐span configuration exhibits higher rotor efficiency and lower airframe download than the half‐span configuration. Half‐span rotor installation trends match available half‐span data, and airframe downloads are reasonably well predicted. Overall, the CFD solutions provide a wealth of flowfield details that can be used to analyze and improve tiltrotor aerodynamic performance.

Document Type: Research Article


Publication date: January 1, 2005

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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