新型运输机机翼的颤振特性分析  

Flutter analysis of new transport-type wings

作　　者：崔鹏[1] 韩景龙[1] 

机构地区：[1]南京航空航天大学航空宇航学院,江苏南京210016

出　　处：《振动工程学报》2011年第2期192-198,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(10872089)

摘　　要：应用高精度耦合计算方法,对带翼梢小翼和C型翼梢的运输机机翼颤振机理进行了研究。气动弹性模拟中,采用Euler方程描述非线性气动力,基于有限元方法获得结构响应。首先详细分析了基本机翼的颤振和极限环振荡(LCO),并与试验值进行比较。在此基础上进行带翼梢装置的机翼颤振特性计算,同时合理分离翼梢装置的质量和气动力作用。研究结果显示,翼梢装置虽然带来气动收益,但对运输机机翼的颤振特性产生了明显的不利影响。翼梢小翼使得颤振速度下降超过10%,并可改变亚音速时机翼的颤振模式;而C型翼梢能使颤振速度降低19%,对颤振频率的影响则较小。This article presents numerical investigations of flutter characteristics of new transport-type wings with winglet and C-type wingtip.The aeroelastic analysis is conducted by use of a high-fidelity coupling approach,where the Euler equations are employed for describing unsteady aerodynamics and structural responses are obtained based on the nonlinear FEM technique.The flutter and limit-cycle-oscillation（LCO） behaviors of the basic wing are simulated firstly,and the results are compared with the existing experiments.Then,flutter analyses of transport wings with wingtip devices are performed,and the mass effect of wingtip device is separated from the aerodynamic effect using a virtual mass condition.The study demonstrates that despite creating aerodynamic benefits,the wingtip devices will produce remarkable adverse effects on flutter characteristics of a transport wing.The winglet addition decreases the flutter speed more than 10%,and may change the flutter mode for subsonic flow case.The C-type wingtip generates a reduction of flutter speed up to 19%,but has a minor impact on the flutter frequency.

关 键 词：气动弹性 颤振分析 翼梢小翼 C型机翼 跨音速 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]