Modeling of conventional flaps at high deflection-rate

Albert Medina, Michael V. Ol, David Williams, Xuanhong An, Maziar Hemati

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


We extend our experiments on a 50%-chord simple trailing edge flap in a NACA0006 airfoil, spanning the test section of a water tunnel, to examine analytical/phenomenological models for lift coefficient for periodic (as opposed to transient) flap-motion. The flap is actuated with a suite of electric linear motors, with period as low as 0.2 convective times. The main element of the wing is kept at 0 □ incidence, while the flap’s motions span a parameter-study of initial and final incidence. We extend the Goman-Khrabrov ordinary different equation for an “internal state” derived from static data, separately for the main-element of the wing, and the flap. This is facilitated by mounting in each wing-element its own force-balance. The ODE’s results are augmented with an added-mass calculation from traditional panel methods, and a parameter-output model to account for super-circulation from entrainment of the flow on the wing’s suction-side, at the higher flap deflection rates. This is compared with similar augmentation of Theodorsen’s attached-flow model.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624104473
StatePublished - 2017
Event55th AIAA Aerospace Sciences Meeting - Grapevine, United States
Duration: Jan 9 2017Jan 13 2017

Publication series

NameAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting


Other55th AIAA Aerospace Sciences Meeting
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2017, American Institute of Aeronautics and Astronautics Inc. All rights reserved.


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