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汽车安全与节能学报

汽车安全与节能学报 ›› 2017, Vol. 08 ›› Issue (01): 59-64.DOI: 10.3969/j.issn.1674-8484.2017.01.007

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基于正交试验设计的阶背车尾部结构优化

屈 贤，余 烽   

  1. 重庆工程职业技术学院 机械工程学院，重庆 402260，中国
  • 收稿日期:2016-11-21 出版日期:2017-03-23 发布日期:2017-03-23
  • 通讯作者: 余烽（1986—），男（汉），湖北，副教授，E-mail: 516685355@qq.com
  • 作者简介:第一作者 / First author ： 屈贤（ 1988—），女( 汉)，山东，助教，E-mail: 1519736515@qq.com。 通讯作者 / Corresponding author ： 余烽（1986—），男（汉），湖北，副教授，E-mail: 516685355@qq.com。
  • 基金资助:

    2016-11-21

Optimization on stepping automotive wake structures based on orthogonal test method

QU Xian, YU Feng   

  1. Chongqing Vocational Institute of Engineering, College of Mechanical Engineering, Chongqing 402260, China
  • Received:2016-11-21 Online:2017-03-23 Published:2017-03-23

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摘要：

阶背汽车尾部尾流场优化，采用计算流体动力学(CFD) 方法计算尾流体场，设计了车尾结构的L25(56) 正交优化试验：利用控制变量法，分析车尾6 个结构因素，每个因素包含5 个参数水平，共进行了25 次试验；运用极差分析法，分析不同结构的影响主次，得出最优化尾部结构。结果表明：车尾结构综合优化可降低气动阻力系数14.4%，有效抑制尾流分离及尾涡拖拽，改善尾流结构。该研究结果可为汽车尾造型优化设计提供重要依据。

关键词: 汽车尾部结构, 尾流场, 计算流体动力学(CFD) , 正交优化实验

Abstract:

An orthogonal test for wake structures was conducted with computational fluid dynamics (CFD) technique to optimize the stepping automotive wake flow field. The method of controlling variable was applied to analyze six main rear structures, and the factor level was preferred. The L25 (56) orthogonal optimization test of
the tail structure method was designed. And the degree of influence from different rear structures was analyzed by use of the range analysis method. The wake flow field of the optimum tail model was obtained. The results show that the wake structure comprehensive optimization decreases the coefficient of the aerodynamic drag by 14.4%. The wake flow structure is improved as the rear airflow was separated and vortexes were suppressed effectively. These results provide an important basis for the optimal design of automotive wake shape.

Key words: automotive rear structure, wake flow field, computational fluid dynamics (CFD), orthogonal experimental design