激励方式对多段翼型升力特性影响的实验研究

缝道流动参数对多段翼型气动特性非常重要。通常采用改变翼型外形、缝道几何参数组合以及流动主／被动控制来改变缝道流动参数，提高多段翼型的气动性能。在不同的声激励方式下，通过风洞实验的方法研究多段翼型升力特性变化的规律，以探索提高增升效果的新途径。采用NF-3风洞实验，着重研究声源在模型表面的位置及排列方式对翼型升力特性影响的规律，包括单点激励、单排多点激励、多排多点激励、M型多点激励等四种不同的激励方式。结果表明：在GAW一1两段翼型的襟翼上表面加入弱声激励，翼型的升力系数有了一定变化；不同的激励方式对翼型升力系数的影响不同；在研究范围内，单点声激励使翼型的升力系数减小，M型多点声激励使翼型的升力系数少量增加。

Influence ofdifferent acoustic excitations on lift characteristic of a multi-element airfoil

The gap flow parameters of multi-element airfoil have significant effect on its lift characteristics. The major method to improve the aerodynamic performance of the airfoil is changed the gap flow parameters by changed the airfoil shape, the combinations of gap geometric parameters and active / passive controlled the gap flow. Using wind tunnel experimental method, the authors compared the lift characteristics of a multi-element airfoil under conditions of different flap acoustic excitation modes for the purpose of exploring a new way to improve the effectiveness of high-lift configuration. The experiments were conducted in NF-3 wind tunnel. Acoustic excitations of disturbances are four modes including single point, single row, multi-slice and the M-type combination. The results showed that, within the range of this research, the weak disturbances of the acoustic excitation can indeed change the lift coefficient of multi-element airfoil. And disturbances manner corresponding to the lift coefficient variation of the airfoil is also inconsistent. The lift coefficient of airfoil was increased by M-type combination acoustic excitation when single point acoustic excitation reduced it.This paper confirms that the designers should study the dynamic press characteristics of flow near the flap.