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Full Length Article | Open Access

Oscillation quenching and physical explanation on freeplay-based aeroelastic airfoil in transonic viscous flow

Yayun SHIa, Shun HEb( ), Gaowei CUIc, Gang CHENa, Yan LIUd
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
Shenyang Aircraft Design Institute, Shenyang 110036, China
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Abstract

Limit Cycle Oscillation (LCO) quenching of a supercritical airfoil (NLR 7301) considering freeplay is investigated in transonic viscous flow. Computational Fluid Dynamics (CFD) based on Navier-Stokes equations is implemented to calculate transonic aerodynamic forces. A loosely coupled scheme with steady CFD and an efficient graphic method are developed to obtain the aerodynamic preload. LCO quenching phenomenon is observed from the nonlinear dynamic aeroelastic response obtained by using time marching approach. As the airspeed increases, LCO appears then quenches, forming the first LCO branch. Following the quenching region, LCO occurs again and sustains until the divergence of the response, forming the second LCO branch. The quenching of LCOs was addressed physically based on the aerodynamic preload and the linear flutter characteristic. An “island” of stable region is observed in the flutter boundary, i.e. the flutter speed versus the mean Angle of Attack (AoA). The LCO quenches when the aerodynamic preload crosses this stable region with the increasing of airspeed. The LCO quenching of this model in transonic flow is essentially induced by destabilizing effect from aerodynamic preload, since the flutter speed is sensitive to AoA due to aerodynamic nonlinearity.

Keywords

Unsteady flowFreeplayNonlinear aeroelasticitySupercritical airfoilTransonic flutter

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Chinese Journal of Aeronautics
Volume 36 Issue 10,
October 2023
Pages 124-136
DOI: 10.1016/j.cja.2023.05.016
Cite this article:
SHI Y, HE S, CUI G, et al. Oscillation quenching and physical explanation on freeplay-based aeroelastic airfoil in transonic viscous flow. Chinese Journal of Aeronautics, 2023, 36(10): 124-136. https://doi.org/10.1016/j.cja.2023.05.016

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Received: 27 September 2022
Revised: 31 January 2023
Accepted: 30 March 2023
Published: 19 May 2023
© 2023 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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