汽车雨刮器的瞬态气动特性

发布时间：2018-11-27 17:53

【摘要】：通过编译用户自定义函数(UDF),利用动网格技术,通过数值计算得到雨刮器的瞬态气动特性,并进行风洞试验验证。通过分析前风窗及雨刮器表面的压力及流场分布,探讨作用在主、副雨刮器上气动升力及气动阻力的变化规律及其对雨刮器稳定性的影响,并引入6个离散位置的稳态计算以进行对比分析。研究结果表明:雨刮器在刮刷过程中受到的气动升力及气动阻力存在最大值,且遵循一定的变化规律,下行时受到的气动升力及气动阻力比上行的大,上行时受到的气动升力及气动阻力大于稳态值,作用在主雨刮器的气动升力及气动阻力比副雨刮器的大;采用的数值模拟方法充分捕捉到雨刮器刮刷过程中的动态效应,所得部分结果与风洞试验结果相吻合,可用于雨刮器的设计与气动特性评价。
[Abstract]:By compiling the user-defined function (UDF), the transient aerodynamic characteristics of the wiper are obtained by numerical calculation and verified by wind tunnel test. By analyzing the pressure and flow field distribution on the front wind window and the surface of the wiper, the variation law of the pneumatic lift and aerodynamic resistance acting on the main and auxiliary wiper and its influence on the stability of the wiper are discussed. The steady-state calculation of six discrete positions is introduced for comparative analysis. The results show that there is a maximum aerodynamic lift and aerodynamic resistance of the wiper in the process of wiper scraping, and the aerodynamic lift and drag are larger in the downlink than in the upward. The aerodynamic lift and aerodynamic resistance of the main wiper are larger than those of the auxiliary wiper, and the aerodynamic lift and the aerodynamic resistance are larger than those of the auxiliary wiper. The dynamic effect of wiper scrape process is fully captured by the numerical simulation method, and some of the results are in agreement with the results of wind tunnel test, which can be used for the design of wiper and the evaluation of aerodynamic characteristics.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南工业大学机械工程学院;
【基金】：国家自然科学基金资助项目(50975083) 交通运输部新世纪十百千人才培养项目(20120222) 中国高水平汽车自主创新能力建设项目(2007) 财政部创新团队项目(0420036017)~~
【分类号】：U463.855

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