合成射流抑制机翼失速颤振的频率控制方法
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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.
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.
引文
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[2]Tang D,Dowell E H.Experimental and theoretical study on aeroelastic response of high-aspect-ratio wings[J].AIAA Journal,2001,39(8):1430-1441
[3]Zhao Y H,Hu H Y.Structural modeling and aeroelastic analysis of high-aspect-ratio composite wings[J].Chinese Journal of Aeronautics,2005,18(1):25-30
[4]周良强,陈芳启,葛鹏.一类大展弦比机翼非线性模型的稳定性与分岔[J].动力学与控制学报,2012,10(3):222-227Zhou L Q,Chen F Q,Ge P.Stability and bifurcation for a nonlinear model of high-aspect-ratio wings[J].Journal of Dynamics and Control,2012,10(3):222-227(in Chinese)
[5]金琰,袁新,申炳録.机翼大攻角下失速颤振的气动弹性研究[J].工程热物理学报,2002,23(5):573-575Jin Y,Yuan X,Shen B R.Aeroelastic analysis of an airfoil's stall flutter at large mean incidence angle[J].Journal of Engineering Thermophysics,2002,23(5):573-575(in Chinese)
[6]Glezer A,Amitay M.Synthetic jets[J].Annual Review of Fluid Mechanics,2002,(34):503-529
[7]Amitay M,Smith D R,Kibens V,et al.Aerodynamic flow control over an unconventional airfoil using synthetic jet actuators[J].AIAA Journal,2011,39(3):361-370
[8]罗振兵,夏志勋,胡建新,等.新型合成射流流动控制激励器的流场特征[J].空气动力学报,2007,(25):107-113Luo Z B,Xia Z X,Hu J X,et al.Flow-field characterization of a novel synthetic jet flow control actuators[J].ACTA Aerodynamica SINICA,2007,(25):107-113(in Chinese)
[9]郝礼书,乔志德.合成射流用于翼型分离流动控制的研究[J].西北工业大学学报,2006,24(4):528-531Hao L S,Qiao Z D.Maximizing the effect of synthetic jet on airfoil separation flow control[J].Journal of Northwestern Polytechnical University,2006,24(4):528-531(in Chinese)
[10]王晋军,冯立好,徐超军.合成射流控制圆柱分离及绕流结构的实验研究[J].中国科学:E辑,2007,37(7):944-951Wang J J,Feng L H,Xu C J.Experimental study on the separation flow control of the circular cylinder by synthetic jet actuator[J].Science in China Series E,2007,37(7):944-951(in Chinese)
[11]矫桂琼,贾普荣.复合材料力学[M].西安:西北工业大学出版社,2008:61-69Jiao G Q,Jia P R.Composite material mechanics[M].Xi'an:Northwestern Polytechnical University Press,2008:61-69(in Chinese)
[12]Armanios E A,Badir A M.Free vibration analysis of anisotropic thin-walled closed-section beams[J].AIAA Journal,1995,33(10):164-171
[13]叶正寅,王刚,杨永年,等.利用N-S方程模拟机翼气动弹性的一种计算方法[J].计算物理,2001,18(5):397-401Ye Z Y,Wang G,Yang Y N,et al.A method to simulate the aeroelastic problem based on navier-stokes equations[J].Chinese Journal of Computational Physics,2001,18(5):397-401(in Chinese)
[14]安效民,徐敏,陈士橹.二阶时间精度的CFD/CSD耦合算法研究[J].空气动力学报,2009,27(5):547-552An X M,Xu M,Chen S L.Analysis for second order time accurate CFD/CSD coupled algorithms[J].ACTA Aerodynamica SINICA,2009,27(5):547-552(in Chinese)
[15]Chen X Y,Zha G C,Yang M T.Numerical simulation of 3-D wing flutter with fully coupled fluid-structural interaction[J].Computers and Fluids,2007,36(5):856-867
[16]陈祥宝.聚合物基复合材料手册[M].北京:化学工业出版社,2004:186-189Chen X B.Manual of polymer matrix composites[M].Beijing:Chemistry Industry Press,2004:186-189(in Chinese)