Effect of Microtab on an Airfoil Transonic Buffet Onset
The effect of microtab on an airfoil transonic buffet onset was investigated. A CFD simulation using Reynolds-averaged Navier–Stokes methods with SST turbulence was conducted to determine the transonic flow around the NACA0012 airfoil with a microtab which is installed perpendicular to the airfoil surface in the vicinity of the trailing edge. The influence of different installing schemes of microtab (a tap is installed on airfoil upper surface, a tap is installed on airfoil lower surface, two taps were symmetrically installed on airfoil upper and lower surfaces) on transonic buffet onset were analyzed and compared. Subsequently, a sensitivity research was conducted to determine the effect of the height and chord wise position of the microtab on transonic buffet onset. The results indicate that the improvement of the buffet onset angle is achieved by installing the microtab on the upper (suction) surface of the airfoil. Furthermore, the buffet onset angle of attack tends to be improved as the height of microtab increases. However, the improvement of the lift coefficient at buffet onset is attained by installing the microtab on the lower (pressure) surface of the airfoil. Similarly, the lift coefficient at buffet onset can be improved with the increasing of microtab height. The variation of microtab chord wise position has little effect on the buffet onset angle, but it has obvious influence upon the lift coefficient at buffet onset.
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072
Abstract：The effect of microtab on an airfoil transonic buffet onset was investigated. A CFD simulation using Reynolds-averaged Navier–Stokes methods with SST turbulence was conducted to determine the transonic flow around the NACA0012 airfoil with a microtab which is installed perpendicular to the airfoil surface in the vicinity of the trailing edge. The influence of different installing schemes of microtab (a tap is installed on airfoil upper surface, a tap is installed on airfoil lower surface, two taps were symmetrically installed on airfoil upper and lower surfaces) on transonic buffet onset were analyzed and compared. Subsequently, a sensitivity research was conducted to determine the effect of the height and chord wise position of the microtab on transonic buffet onset. The results indicate that the improvement of the buffet onset angle is achieved by installing the microtab on the upper (suction) surface of the airfoil. Furthermore, the buffet onset angle of attack tends to be improved as the height of microtab increases. However, the improvement of the lift coefficient at buffet onset is attained by installing the microtab on the lower (pressure) surface of the airfoil. Similarly, the lift coefficient at buffet onset can be improved with the increasing of microtab height. The variation of microtab chord wise position has little effect on the buffet onset angle, but it has obvious influence upon the lift coefficient at buffet onset.
刘金利，杨智春，丁允停. Microtab对翼型跨音速抖振始发特性的影响[J]. 振动与冲击, 2015, 34(5): 39-43.
Liu Jinli, Yang Zhichun，Ding Yunting . Effect of Microtab on an Airfoil Transonic Buffet Onset. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(5): 39-43.
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