基于流-固耦合算法的跨/超声速曲壁板气动弹性分析  

Aeroelastic analysis of curved panels in transonic/supersonic airflow based on a fluid-structure coupling algorithm

作　　者：梅冠华[1] 张家忠[2] 康灿[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《振动与冲击》2016年第22期54-60,71,共8页Journal of Vibration and Shock

基　　金：国家973计划(2012CB026002);国家科技支撑计划(2013BAF01B02);江苏高校优势学科建设工程资助项目;江苏大学高级人才科研启动基金(15JDG155)

摘　　要：采用流-固耦合算法研究了曲壁板在跨/超声速气流下的气动弹性特征。首先,给出了曲壁板的Von Kármán几何大变形运动方程,并对其进行了标准有限元离散。然后,简述了流动的控制方程、数值解法、动网格和流-固耦合方式。最后,对曲壁板的气动弹性响应进行了数值模拟和分析。结果表明弯曲造成壁板的初始气动载荷非零,使得其与平壁板的气动弹性特征大相径庭:稳定的曲壁板存在静气动弹性变形;马赫数为2时,曲壁板失稳后,其颤振负向峰值远大于正向峰值,且弯曲高度的增大会诱发混沌型的振动;马赫数为0.8和0.9时,曲壁板仅会发生正向变形;马赫数为1.2时,失稳后曲壁板的颤振中心偏向了负方向。所得结果为高速飞行器的壁板设计和颤振抑制提供了依据,所提算法可推广应用于其它气动弹性问题的数值分析。A fluid-structure coupling algorithm was used to analyze the aeroelastic behaviors of curved panels in transonic /supersonic airflow.According to the Von Karman＇s large deformation theory,the governing equation of curved panels was presented,and it was discretized by the standard finite element method.The governing equations of fluid, numerical method, moving mesh technique and fluid-structure coupling way were introduced briefly. Numerical simulations and analyses were carried out to study the aeroelastic behaviors of curved panels.The results demonstrate that the curvature causes nonzero initial aerodynamic load on panels,which brings about greatly different aeroelastic features for curved panels compared with flat panels.Static aeroelastic deformations exist on curved panels in steady state.At Mach number of 2,the asymmetric flutter will be born as curved panels lose their stability.As the curvature height increases,the chaotic flutter can be induced.At Mach number of 0.8 and 0.9,curved panels bear only positive aeroelastic deformation.At Mach number of 1.2,with the stability lost,curved panels flutter more violently in the negative direction.The results obtained could guide the panel design and flutter suppression for high performance flight vehicles.The presented algorithm could be extended to numerically analyze other aeroelastic problems.

关 键 词：壁板颤振 流 -固耦合 气动弹性 

分 类 号：O323[理学—一般力学与力学基础]