-毕业设计（论文）-面包车车身造型的改进设计.docVIP

2 摘 要 和汽车发展一样，汽车车身发展也历经了结构、性能、外形、安全节能与环保四个发展阶段。研究终极成果直指降低汽车燃油消耗量、提高汽车加速度和最大行驶速度三大经济性与操纵稳定性指标。具体包括气动力、气动力矩、汽车空气动力稳定性、汽车表面三维流场和表面压强以及汽车外形局部动力学特征等，并通过汽车的外形变化——车身造型予以体现。 基于车身空气动力学改进的设计，空气动力学特性是影响汽车性能的最重要因素，它针对汽车给环境、能源带来的弊端，解决了汽车动力性、安全性方面的诸多问题，而且与汽车造型技术相互依存。空气动力学性能越来越被重视，以低阻物体为出发点、减小正投影面积、追求楔型风格和表面平滑化等，而且计算流体动力学(CFD)必将给汽车空气动力学以新的面貌。 FLUENT软件是目前对于汽车空气动力性计算较为先进的软件，对于车身造型改进来说有相当重要的作用，大大减少了设计造型时间，减少设计成本。 关键词：车身设计，空气动力学，流体力学软件 Microbus body design and improvement Abstract The modern automobile condensed the complete achievement of the near hundred year human industry civilization, becomes “the change world machine”. As same with the automobile development, the automobile body development has also had been through repeatedly the structure, the performance, the contour, the safe energy conservation and the environmental protection four development phase. Studies the ultimate achievement to refer straight reduces the automobile fuel oil consumption, enhances the automobile acceleration and the maximum traveling speed three big efficiencies and the operation stability criterion. Includes the aerodynamic force, the aerodynamic moment, the automobile aerodynamic force stability, the automobile surface three dimensional flow field and the superficial intensity of pressure as well as the automobile contour partial dynamics characteristic specifically and so on, and manifests through the automobile contour change the automobile body modelling. This article is based on the automobile body aerodynamics improvement design, the aerodynamics characteristic is affects the automobile performance the most important attribute, it in view of the automobile the malpractice which to the environment, the energy brings, has solved the automobile power, secure aspect many questions, moreover depends on each other mutually with the automobile modelling technology. The aerodynamics performance is taken more and more, take the low-drag body as the starting point, reduces the normal projection ar