汽车工程

汽车工程 ›› 2020, Vol. 42 ›› Issue (5): 593-599.doi: 10.19562/j.chinasae.qcgc.2020.05.005

• • 上一篇    下一篇

不同雷诺数下车辆队列尾车发动机舱盖气动特性研究*

戴文童1,2, 李启良1,3, 李卓明1,3, 常艺菲1,3, 杨志刚1,3   

  1. 1.同济大学,上海地面交通工具风洞中心,上海 201804;
    2.博格华纳(中国投资有限公司,上海 200241;
    3.上海市地面交通工具空气动力与热环境模拟重点实验室,上海 201804
  • 出版日期:2020-05-25 发布日期:2020-06-17
  • 通讯作者: 李启良,副研究员,博士生导师,博士,E-mail:qiliang@tongji.edu.cn
  • 基金资助:
    *上海市地面交通工具风洞专业技术服务平台项目(19DZ229400)和上海市地面交通工具空气动力与热环境模拟重点实验室项目(18DZ2273300)资助。
       原稿收到日期为2019年4月15日,修改稿收到日期为2019年7月16日

Investigation into Bonnet Aerodynamic Characteristics of Follower Vehicle in Two-vehicle Platoon at Different Reynolds Numbers

Dai Wentong1,2, Li Qiliang1,3, Li Zhuoming1,3, Chang Yifei1,3, Yang Zhigang1,3   

  1. 1.Tongji University, Shanghai Automotive Wind Tunnel Center, Shanghai 201804;
    2.BorgWarner (China) Investment Company, Shanghai 200241;
    3.Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai 201804
  • Online:2020-05-25 Published:2020-06-17

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摘要： 数值仿真与模型风洞试验相结合研究了典型工况下两车队列中尾车发动机舱盖气动特性和两车间隔区域的流场,对比了缩比模型和实车模型对应雷诺数下车辆队列的流动形态。缩比模型仿真结果与风洞试验结果一致表明采用数值方法的可行。对比不同雷诺数下车辆队列气动特性发现,缩比模型与实车模型发动机舱盖表面平均静压分布基本相同,但在纵向对称面上,实车模型的前车尾迹比缩比模型更加上扬,底部区域气流速度更高。非定常条件下,实车模型前车尾涡相对尺度明显小于缩比模型,且扩散得更充分,尾迹区涡的分布状态更加混沌,发动机舱盖表面脉动能量的分布更加混乱。涡在两车间隔区域的运动并非简单的移动,而是一个由涡破裂、涡配对和涡融合构成的复杂过程。

关键词: 两车队列, 尾车, 发动机舱盖, 气动特性, 雷诺数效应, 非定常流场

Abstract: The bonnet aerodynamic characteristics of follower vehicle and the flow field in the interspace between vehicles in a two-vehicle platoon are studied, and the flow patterns of scaled model and full scale vehicle model with corresponding Reynolds numbers for two-vehicle platoon are compared by both numerical simulation and model wind tunnel test. The results of simulation are consistent with wind tunnel test for the scaled model, indicating the feasibility of the numerical method adopted. The comparison of the aerodynamic characteristics of platoon at different Reynolds numbers shows that the average static pressure distribution on the bonnet surfaces for both the scaled model and full scale model are basically identical, but on the longitudinal symmetric plane, the tail trace of leading vehicle for full scale model is more up-wards with higher air-flow velocity in bottom area compared with the scaled model. Under unsteady condition and compared with the scaled model, the relative scale of tail vortex of leading vehicle for full scale model apparently smaller, its diffusion is more sufficient with more chaotic state of distribution, and the distribution of pulsating energy on bonnet surface is more disorderly. The movement of vortex in the interspace between vehicles is not a simple displacement but a complex process composed of breakup, pairing and fusing of vortex

Key words: two-vehicle platoon, follower vehicle, bonnet, aerodynamic characteristics, Reynolds number effect, unsteady flow field