基于CFD的在役飞机电接触致热效应计算方法

Computational method of electrical contact heating effect of in-service aircraft based on CFD

为了弥补红外热成像技术受可达性限制的不足,精确获取非金属封闭体内电接触部位复杂热流场信息,提出一种基于计算流体力学(computational fluid dynamics,CFD)的在役飞机电接触致热效应计算方法。针对圆柱面接触模型进行结构和数值离散,分析了不同辐射模型对仿真计算结果的影响,认为表面辐射(surface to surface,S2S)模型在得到较好的仿真结果的同时,其迭代所占用的计算资源较少;针对封闭体-电接触模型,采用分段细化-平滑建模及近壁网格处理方法,实现了模型结构的有效离散,得到了致热耦合三维热流场,与红外温度谱的特征相符,通过探究计算流体力学与实验方法结合的技术路径,为电接触可靠性分析及失效预判等实效方法的提出开展有益探索。

In order to make up for the limitation of infrared thermal imaging technology in accessibility and accurately obtain complex heat flow information of electrical contact parts in non-metallic enclosed bodies,a computational method of electrical contact heating effect of in-service aircraft based on computational fluid dynamics(CFD)was proposed.In this paper,the influence of different radiation models on the simulation results is analyzed based on the structural and numerical discretization of the cylindrical contact model.It is concluded that the surface radiation(S2S)model can get better simulation results,and its iteration consumes less computational resources.For the closed bodyelectrical contact model,piecewise thinning-smoothing modeling and near-wall mesh processing are adopted to realize effective dispersion of model structure,obtaining the thermogenic coupling three-dimensional heat flow field,which is consistent with the characteristics of infrared temperature spectrum.By exploring the technical path of combining computational fluid dynamics with experimental methods,it is beneficial to exploring the practical methods of electrical contact reliability analysis and failure prediction.