Unsteady flow physics of airfoil dynamic stall

Rohit Gupta, Phillip J. Ansell

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

Abstract

A series of wind-tunnel experiments were conducted on a dynamically pitching airfoil in order to understand the unsteady flow physics associated with dynamic stall. An NACA 0012 airfoil was dynamically pitched about the quarter-chord axis using with a linear ramp maneuver at Re = 500,000 and ω+= 0.05. A series of high-frequency unsteady surface pressure measurements were acquired, which actively displayed the movement of boundary-layer transition across the surface, along with the formation and convection of the dynamic stall vortex. A detailed time-frequency analysis of the surface pressure measurements also revealed the evolutionary behavior of the unsteady flow structures during the pitch maneuver, including the development of high-frequency turbulent flow oscillations prior to the formation of the dynamic stall vortex. Time-resolved particle image velocimetry data revealed the formation of coherent vortical structures after suction breakdown at the airfoil leading-edge region, which collectively interact to form the dynamic stall vortex.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624104473
DOIs
StatePublished - Jan 1 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

Other

Other55th AIAA Aerospace Sciences Meeting
CountryUnited States
CityGrapevine
Period1/9/171/13/17

Fingerprint

Unsteady flow
Airfoils
Physics
Vortex flow
Surface measurement
Pressure measurement
Flow structure
Velocity measurement
Turbulent flow
Wind tunnels
Boundary layers
Experiments

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Gupta, R., & Ansell, P. J. (2017). Unsteady flow physics of airfoil dynamic stall. In AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting [AIAA 2017-0999] (AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2017-0999

Unsteady flow physics of airfoil dynamic stall. / Gupta, Rohit; Ansell, Phillip J.

AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., 2017. AIAA 2017-0999 (AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting).

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

Gupta, R & Ansell, PJ 2017, Unsteady flow physics of airfoil dynamic stall. in AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting., AIAA 2017-0999, AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting, American Institute of Aeronautics and Astronautics Inc., 55th AIAA Aerospace Sciences Meeting, Grapevine, United States, 1/9/17. https://doi.org/10.2514/6.2017-0999
Gupta R, Ansell PJ. Unsteady flow physics of airfoil dynamic stall. In AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc. 2017. AIAA 2017-0999. (AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting). https://doi.org/10.2514/6.2017-0999
Gupta, Rohit ; Ansell, Phillip J. / Unsteady flow physics of airfoil dynamic stall. AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., 2017. (AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting).
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