某特种车防护车身的空气动力学分析与设计优化

摘要

防护装甲因其可以对车内人员与设备进行有效防护,所以在原有车身底盘基础上采用防护装甲方式对防护车身进行设计,可提高原有车辆的防护能力.由于制作工艺问题使得防护车身无法做到常规车身的流线型设计,空气阻力系数较大,同时因为防护车身较原车身质量大幅增加,接近原车的极限承载能力,影响整车的动力性.基于某短轴距特种车防护车身模型,对其进行车身外流场分析,并探讨空气动力学特性对整车动力性的影响,在此基础上对车身外形进行了优化.%Because protective armor can effectively protect the vehicle and equipment,it can be used for designing the protective body based on the original vehicle chassis to improve its protection capability.However,due to the production process cause,the protective body cannot be made achieve the regular streamline body design,so its coefficient of air resistance is large.At the same time,because the protective body greatly weighs over the original body it is close to the original vehicle's ultimate bearing capacity and has an impact on its power performance in the middle and high speed.This paper analyzes the external flow field of the model of special vehicle protection body with short wheelbase,and discusses the influence of aerodynamic characteristics on the vehicle dynamic performance,and then,optimizes its body contour design.