合成射流抑制机翼失速颤振的频率控制方法  

Frequency Control Method for Stall Flutter Suppression Using Synthetic Jet

作　　者：胡振[1] 徐道临[1] 张海成[1] 刘春嵘[1] 

机构地区：[1]湖南大学机械与运载工程学院,长沙410082

出　　处：《机械科学与技术》2014年第7期1105-1110,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(11272116)资助

摘　　要：提出合成射流抑制机翼失速颤振的频率控制方法。建立了大展弦比轻质复合材料机翼的动力学方程,研究了复合材料机翼经典颤振特性,发现其临界颤振速度通常都高于大展弦比无人飞行器的巡航速度。着重讨论机翼失速颤振的幅频特性,基于合成射流可改变涡脱频率这一已有的试验事实,提出利用合成射流分段打乱机翼展向的涡脱频率,使其避开机翼结构固有频率,从而抑制机翼的失速颤振。以NACA0012翼型为例,数值验证了合成射流抑制颤振的效果。结果表明,此方法可显著降低颤振振幅。The frequency control method for stall flutter suppression with synthetic jet actuators （SJA） was proposed. The dynamics equation for high-aspect-ratio composite wing was established. The characteristics of the traditional flutter of the composite wing were analyzed, and it is found that critical flutter speed was above the cruising speed. Therefore, the amplitude-frequency characteristic of the stall flutter was discussed in detail. Furthermore, the stall flutter suppression strategy was presented with the principle of disturbing the vortex shedding frequencies on the wingspan with synthetic jet actuators （SJA） to keep away from the natural frequency of the wing. The feasibility of the proposed method was numerically verified by taking the stall flutter suppression of a NACA0012 airfoil as a case study. The results show that the flutter amplitude is decreased significantly.

关 键 词：失速颤振 涡脱频率 合成射流 幅频特性 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]