静气弹中非线性气动力建模方法与分析

大展弦比低雷诺数气动布局容易较早出现气流分离,会带来明显的非线性气动力问题。针对此类布局提出了一种建立基于Kriging插值的非线性压力系数分布模型的方法。从Navier-Stokes方程计算的不同状态下飞机的压力系数中提取不同坐标的系数。利用Kriging插值函数建立CFD压力系数对迎角导数的响应面,将插值结果代入偶极子网格法(Double-Lattice Method,DLM)修正其线性方法。利用无限板样条(IPS)方法进行气动结构耦合,实现了有限元结构的非线性气弹响应分析。算例结果验证了方法对于静气弹分析的有效性,同时能准确地反映弹性带来的气动效率的降低和非线性力矩特征。

Nonlinear Aerodynamic Modeling and Research in Static Aeroelasticity

For the problem that large aspect ratio of the low reynold number aerodynamic layout appeared earlier in the laminar separation,and bring obvious nonlinear aerodynamic.The model of a distributed non-linear pressure coefficient based on the Kriging interpolation method is proposed for this layout.The pressure coefficient of the plane in different coordinate is extracted from the result calculated by the Navier-Stokes equations in different flight status,use of Kriging interpolation function to create the response surface which is derivative of CFD pressure coefficient on the angle of attack,put the interpolation results into the Double-of Lattice Method to amend its linear methods.use the infinite plate spline(IPS) method to couple the fluid-structure and realize finite element of nonlinear aeroelastic response analysis.Example is given in the text,the results demonstrate the validity of the method for the analysis of the static aeroelastic same time be able to accurately reflect the reduction of aerodynamic efficiency brought by flexibility and non-linear moment characteristics.