AbstractIntensive numerical calculations have been carried out on the NLR 7301 supercritical airfoil section under transonic flow conditions. The airfoil is assumed to be suspended in a two degree of freedom aero elastic system allowing the airfoil to move in both pitching and plunging modes respectively. The numerical code used for the present investigation is a two-dimensional time accurate Navier–Stokes solver based on the full equations. The Spalart–Allmaras turbulence model has been used throughout the calculations. The elastic constraints, mass ratio, etc. have been taken from frequent tests in the DLR-DNW transonic wind tunnel carried out by the DLR Institute of Aeroelasticity in Göttingen, Germany. The numerical calculations have two goals: investigation of the buffet boundary on the fixed airfoil under transonic flow conditions, flutter investigations on the airfoil under aero elastic conditions. From the flutter calculations it has been shown that in addition to the Mach number, the neutral position of the torsion spring is of considerable importance for the investigation. Therefore this parameter has been studied in some detail. Numerical results obtained are presented in suitable form and compared with available experimental data.
Numerical study of buffet and transonic flutter on the NLR 7301 airfoil
Aerospace Science and Technology ; 7 , 7 ; 540-550
2003-07-07
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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