积冰机翼失效故障诊断

The Fault Diagnosis of Aerodynamical and Structural Performance for Icing Wing

针对某型飞机机翼积冰后机翼性能改变问题,提出了一种基于流场和结构场耦合分析的机翼气动特性、结构特性故障诊断方法。该方法首先应用有限体积法对二维定常不可压粘流的时均N-S方程进行离散求解,采用四阶龙戈-库塔(RK)法求解水滴运动方程确定污染程度,然后耦合流场和结构场分析积冰后的机翼特性,通过对比未污染时的机翼气动特性和结构特性和安全飞行包线指标,判断积冰机翼是否失效。通过机翼积冰的相似实验结果表明,该方法能有效的应用于积冰机翼的性能判断和故障诊断中。

To solve the performance changing problem of icing wing of one aircraft,a test method of aerodynamic characteristics and structural characteristics based on flow field and structure field coupled analysis is proposed.The method is used to discretely analyze time-averaged N-S equation of two-dimensional steady incompressible viscous flow by finite element method,and solve droplet trajectory equation by 4-order ronggo-kuta method to determine the degree of pollution.Then coupled analyziz flow field and structure field,and compared with unpolluted wing＇s aerodynamic characteristics and structural characteristics to determine the optimal position which improve icing wing performance.Practical similar experiment shows that the method can be applied to evaluate performance and optimum design of the icing wing.