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Home / Journal of the American Helicopter Society, Volume 39, Number 4

On the Influence of Time‐Varying Flow Velocity on Unsteady Aerodynamics

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Authors: van der Wall, B. G.; Leishman, J. G.

Source: Journal of the American Helicopter Society, Volume 39, Number 4, 1 October 1994, pp. 25-36(12)

Publisher: Vertical Flight Society

DOI: https://doi.org/10.4050/JAHS.39.25

The effects of a periodic free‐stream velocity on the unsteady aerodynamics of an airfoil in incompressible flow are examined. Existing theories are reviewed, and their simplifications and limitations are properly identified. A new general aerodynamic theory for an airfoil undergoing a combination of harmonic pitching, plunging and fore‐aft motion is presented. An extension to arbitrary free‐stream velocity variations and arbitrary airfoil motion is also given. The theoretical results are validated against numerical predictions made by a modern Euler code.

Document Type: Research Article

Affiliations: Institute for Flight Mechanics, DLR Braunsc¸hweig, Germany

Publication date: 01 October 1994

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

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