基于N-S方程的飞机风挡雨刷气动力计算

发布时间：2018-03-29 09:07

本文选题：风挡雨刷　切入点：N-S方程　出处：《空气动力学学报》2016年06期

【摘要】：风挡雨刷在飞行过程中易出现被气流吹离复位位置、飘起现象,阻碍飞行员视野,严重影响飞行安全。选取某型机风挡雨刷作为优化对象,采用了结构、非结构混合网格的办法,在机身壁面附近生成结构化网格,在雨刷机构表面生成非结构化网格,用Interface面将两部分结合生成雨刷最终计算模型。利用Fluent软件,基于N-S方程和S-A湍流模型,采用时间平均法对不可压缩流的参数进行时均化,计算了不同飞行状态下,风挡雨刷在复位位置以不同角度停放及增加扰流板时所受气动力,对风挡雨刷的外形及停放角度进行优化,比较分析了优化前后雨刷所受气动力。仿真计算结果表明,雨刷合理的停放角度、在刷臂上加装扰流板能有效引导风挡雨刷迎风面气流的方向,从而减小雨刷迎风面所受气动力。通过试飞验证了数值计算的可靠性及优化方案的可行性,为风挡雨刷预紧力的设置及复位位置的确定提供依据。
[Abstract]:Windshield wiper appeared easily during the flight by air blowing from the reset position, floating phenomenon, hindering the pilot vision, seriously affect the flight safety. Selecting a certain type of aircraft windshield wiper as optimization object, the structure of unstructured hybrid grid method in the fuselage near the wall to generate structured meshes, unstructured mesh generation in the wiper mechanism the surface, Interface surface will be combined with the two part of the final generation of wiper model. Using Fluent software, N-S equation and S-A turbulence model based on parameters of the incompressible flow is averaged by time average method, the calculation of different flight conditions, dynamic drag in windshield wiper reset position at different angles and increase parking the spoiler, optimize shape and parking angle on the windshield wiper, were compared and analyzed before and after optimization aerodynamic wiper. The simulation results show reasonable wiper Parking angle, installing spoiler windshield wiper can effectively guide the windward airflow in the brush arm direction, thereby reducing the rain brush windward aerodynamic force. Through flight test to verify the feasibility and reliability of the optimization scheme of numerical calculation, provide the basis for the windshield wiper preload setting and determining the position of the complex.

【作者单位】：中航工业第一飞机设计研究院;
【分类号】：V211.3

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