PIV and surface pressure measurements on a NACA64418 airfoil undergoing stall flutter

Gkiolas, Dimitris; Mathioulakis, D. S.

doi:10.2514/6.2020-0090

AIAA Scitech 2020 Forum 2020

DOI: 10.2514/6.2020-0090

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PIV and surface pressure measurements on a NACA64418 airfoil undergoing stall flutter

Dimitris Gkiolas

D. S. Mathioulakis

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2021

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Aerodynamic Study of a NACA 64418 Rectangular Wing under Forced Pitching Motions

Gkiolas

Mathioulakis

2021

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The aerodynamic behavior of a pitching NACA 64418 rectangular wing was experimentally studied in a subsonic wind tunnel. The wing had a chord c = 0.5 m, a span which covered the distance between the two parallel tunnel walls and an axis of rotation 0.35 c far from the leading edge. Based on pressure distribution and flow visualization, intermittent flow separation (double stall) was revealed near the leading edge suction side when the wing was stationary, at angles higher than 17° and Re = 0.5 × 106. Under pitching oscillations, aerodynamic loads were calculated by integrating the output data of fast responding surface pressure transducers for various mean angles of attack (αm (max) = 15°), reduced frequencies (kmax = 0.2) and angle amplitudes Δα in the interval [2°, 8°]. The impact of the above parameters up to Re = 0.75 × 106 on the cycle-averaged lift and pitching moment loops is discussed and the cycle aerodynamic damping coefficient is calculated. Moreover, the boundaries of the above parameters are defined for the case that energy is transferred from the flow to the wing (negative aerodynamic damping coefficient), indicating the conditions under which aeroelastic instabilities are probable to occur.

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Aerodynamic Study of a NACA 64418 Rectangular Wing under Forced Pitching Motions

Gkiolas

Mathioulakis

2021

Fluids

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PIV and surface pressure measurements on a NACA64418 airfoil undergoing stall flutter

Cited by 1 publication

References 10 publications

Aerodynamic Study of a NACA 64418 Rectangular Wing under Forced Pitching Motions

Aerodynamic Study of a NACA 64418 Rectangular Wing under Forced Pitching Motions

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