翼型加装格尼襟翼的高亚声速气动特性研究

doi:10.7527/S1000-6893.2013.0169

Abstract

Abstract:

In order to investigate the performance of airfoils equipped with Gurney flaps (GF) under high subsonic flow, the aerodynamic characteristics of airfoil NACA 8-H-12 with Gurney flaps of different heights are calculated by means of a numerical method. The Reynolds average Navier-Stokes (RANS) equations are chosen as the governing equations in numerical calculation, with the application of the finite volume method for discretization. The Roe flux difference splitting scheme is employed to calculate the flux. Turbulence model is shear stress transition (SST) k-ω two equations model. The heights of the Gurney flaps are 1%, 2% and 5% chord length respectively, mounted perpendicular to the chordline of the airfoil at the trailing edge and 5% chord ahead of the trailing edge. The results show that a double vortex structure is formed behind the Gurney flap when the Mach number is 0.8. Because of the acceleration of the flow around the airfoil, the airfoil circulation is increased by this structure, and therefore the lift coefficient increases significantly. The shock wave position is postponed at a lower angle of attack, and this phenomenon is beneficial to lift enhancement. An equipment location comparison shows that the Gurney flap equipped at the airfoil trailing edge improves the lift-drag ratio most significantly. Gurney flaps of 1%, 2% and 5% chord height are all able to improve the lift-drag ratio at the same given lift coefficient, but higher Gurney flap makes the airfoil moment coefficient increase significantly. So for practical application, the height of the Gurney flaps must be limited to avoid the adverse effects caused by excessive nose-down moment.

Key words: Gurney flap, numerical calculation, shock wave, aerodynamic characteristic, lift-drag ratio

CLC Number:

V211.41

CUI Zhao, HAN Dong, LI Jianbo. Study on Aerodynamic Characteristics of Airfoil with Gurney Flaps Under High Subsonic Flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(10): 2277-2286.

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Study on Aerodynamic Characteristics of Airfoil with Gurney Flaps Under High Subsonic Flow

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