@Article{icces.2022.08753,
AUTHOR = {Shun He, Gaowei Cui},
TITLE = {Aeroelastic Analysis of a Supercritical Airfoil with Free-Play in  Transonic Flow},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {24},
YEAR = {2022},
NUMBER = {1},
PAGES = {1--4},
URL = {http://www.techscience.com/icces/v24n1/48978},
ISSN = {1933-2815},
ABSTRACT = {An investigation has been made into the nonlinear aeroelastic behavior of a supercritical airfoil (NLR 
7301) considering free-play in transonic flow. Computational Fluid Dynamics (CFD) based on NavierStokes equations is implemented to calculate unsteady aerodynamic forces. A loosely coupled scheme 
with steady CFD and a graphic method are developed to obtain the static aeroelastic position. 
Frequency domain flutter solution with transonic aerodynamic influence coefficient is used to capture 
the linear flutter characteristic at different angle of attack (AoA). Time marching approach based on 
CFD is used to calculate the nonlinear aeroelastic response. The bifurcation diagram of pitching 
motion shows that as the airspeed increases, the limit cycle oscillation (LCO) appears then quenches, 
forming the first LCO branch; LCO occurs again and sustains until the divergence of the response, 
forming the second LCO branch. This phenomenon is essentially induced by the combined action of 
the static aeroelastic position caused by the camber effect of the airfoil and the S shape flutter 
boundary with respect to AoA.},
DOI = {10.32604/icces.2022.08753}
}