一种诊断和评估积冰机翼失效故障的新方法

针对某型飞机机翼污染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、结构特性检测方法.该方法首先应用有限元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,然后利用流场和结构场耦合分析污染后的机翼特性,通过与未污染机翼气动特性和结构特性的情况对比,确定污染机翼性能变化并作出是否失效判断.通过机翼污染的相似实验结果表明,该方法能有效的应用于污染机翼的性能判断与优化设计.

A new method to evaluate failure diagnosis of icing wing

To solve the performance change of polluted wings of aircrafts,a test method of aerodynamic and structural characteristics is proposed on basis of coupled analysis about flow and structure fields.The method is used to discretely analyze time-averaged N-S equations of two-dimensional steady incompressible viscous flow by finite element methods.Droplet trajectory equations are solved to determine the degree of pollution by 4-order ronggo-kuta method.The optimal position which improve polluted wing performance can be determined by coupled analysis between flow and structure field and comparison with unpolluted wing’s aerodynamic and structural characteristics.Results obtained by present method can be applied to evaluate performance and optimum design of the polluted wing.The method presented in this paper can be validated by practical similar experiments.