车辆后备箱变容设计及外流场数值模拟分析

摘要

Multi-function and practicality have attracted more attention in the research of vehicle engineering.Based on the requirements for family economic cars,more attentions are paid to the vehicle trunk transforming.Firstly,based on the regenerated movement link theory,the structure of the transformation mechanism for vehicle trunk is designed.Furthermore,in order to obtain an optimal design,a numerical simulation analysis based on aerodynamic performance is conducted,and the improvements are made with these simulation results.The results prove that the proposed mechanical structure design conforms with the requirements and completes the transformation between the forms of sedan and hatchback.The sedan has the smaller wind resistance coefficient than the hatchback,and has the advantages in aerodynamics.The study results supply theoretical support and practical basis for variable volume vehicle design.%功能多元化及实用化是当前车辆工程领域的研究热点和趋势。针对家庭经济型轿车的实际应用需求，从车辆后备箱容积可变角度开展研究工作。首先，基于机构再生运动链理论对后备箱变形机构的基本结构进行设计；其次，为获得最优的机构设计方案，对车辆变形前后的气动性能进行数值模拟分析，并根据模拟分析结果对设计方案进行相应改进。研究结果表明，设计的变形机构满足设计目标要求，能够完成车辆在三厢形态与两厢形态之间的变形，且三厢形态车辆的阻力系数小于两厢形态，有一定的气动性能优势。相关研究结果为可变容积车辆设计提供了理论分析依据和实践参考。