吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (3): 717-724.doi: 10.13229/j.cnki.jdxbgxb201703004

• • 上一篇    下一篇

不同后倾角三维车辆的尾迹非定常流动分析

崔文诗1, 2, 杨志刚1, 2, 王国俊1, 2, 周华1, 2   

  1. 1.同济大学 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;
    2.同济大学 上海地面交通工具风洞中心,上海 201804
  • 出版日期:2017-05-20 发布日期:2017-05-20
  • 通讯作者: 杨志刚(1961-),男,教授,博士生导师.研究方向:汽车空气动力学.E-mail:zhigang.yang@sawtc.com
  • 作者简介:崔文诗(1986-),男,博士研究生.研究方向:汽车空气动力学.E-mail:1210765@tongji.edu.cn
  • 基金资助:
    “973”国家重大基础研究发展计划项目(2011CB711203)

Unsteady flow analysis for wakes of three-dimensional vehicles with different rear slant angles

CUI Wen-shi1, 2, YANG Zhi-gang1, 2, WANG Guo-jun1, 2, ZHOU Hua1, 2   

  1. 1.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thremal Management System, Shanghai 201804,China;
    2.Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai 201804, China
  • Online:2017-05-20 Published:2017-05-20

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摘要： 为了控制车辆气动力和噪声,基于热线风速仪将流动与频谱法、相关分析方法结合,对不同后倾角(0°,25°和35°)的三维车辆尾迹非定常流动进行试验研究。0°模型主频数为2个,对应流向和侧向涡脱落作用;25°模型主频数为4个,对应流向涡脱落及其共振作用、C柱涡和斜背动态分离作用;35°模型主频数为3个,对应C柱涡和上、下流向涡脱落作用。结果表明,模型间存在差异的原因是后倾角的不同使得流动分离位置、斜背流动、C柱涡产生差异,进而导致主频数及其表征的非定常流动结构、空间分布规律不同。

关键词: 车辆工程, 非定常流动, 尾迹, 涡脱落, 流动分离

Abstract: IN order to control the aerodynamic force and noise of ground vehciels, unsteady flows in the wake of three-dimensional (3D) vehicles with different rear slant angles (0°, 25° and 35°) were experimentally studied with fluid dynamics, spectrum and correlation analysis for data processing, using hot wire anemometry. Two frequencies measured in the wake of 0° model are resulted from the unsteady flow emanating from the recirculation bubbles in the flow direction and the side direction respectively. Four frequencies detected for the 25° model are ascribed to C-pillar vortex, dynamics attachment flow on the rear slant, the structures emanating from recirculation bubbles in flow direction and resonance effect. Three frequencies captured for 35° model are connected to the structures emanating from the recirculation bubbles in flow direction and C-pillar vortex. The differences are significant among different models. Flow separation position, flow on the rear slant, C-pillar vortex are all different for different slant angle, which explains the physical meaning for each unsteady flow, the quantity and spatial distribution of dominant frequency.

Key words: vehicle engineering, unsteady flow, wake, vortex shedding, flow separation

中图分类号: 

  • U467.1
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