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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2912-06
定常射流阵列控制地面车辆气动阻力
崔文诗1, 2,杨志刚1, 2, 3,王国俊1, 2

(1. 同济大学 上海地面交通风洞中心,上海,201804; 2. 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; 3. 北京民用飞机技术研究中心,北京,102211)

摘 要: 为了控制地面车辆气动阻力,通过风洞实验和大涡模拟仿真方法,研究定常射流对地面车辆流动控制的影响;研制由17只定常射流器构成的射流阵列装置,将其安装在车辆顶部和斜背交界处,进行流动控制实验;探讨射流倾角和动量系数等射流参数对三维地面车辆的非定常流动和气动力的控制机理。研究结果表明:数值仿真方法可有效模拟气动力变化趋势。动量系数不改变气动力变化趋势,仅影响变化幅值。射流倾角决定射流出口附近的速度分布,影响气流分离,导致气动力的差异。与无控制下相比,当射流倾角为-25°~65°时,可实现减阻;而当射流倾角为80°~115°时,对应的阻力未减小。

 

关键词: 地面车辆;定常射流;射流倾角;流动分离;气动阻力

Aerodynamic drag control of a ground vehicle using steady blowing array
CUI Wenshi1, 2, YANG Zhigang1, 2, 3, WANG Guojun1, 2

1. Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai 201804, China; 2. Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems,Shanghai 201804, China; 3. Beijing Aeronautical Science & Technology Research Institute, Beijing 102211, China

Abstract:In order to control the aerodynamic drag of a ground vehicle, the effect of steady blowing array on the flow over a ground vehicle was investigated through the wind tunnel experiments and large eddy simulations. The array device composed of 17 steady blowing jets was developed, which was set on the junction between the slant and the roof of a ground vehicle, and the flow control experiments were carried out. The control mechanism of the excitation parameters, such as the jet direction angle and momentum coefficient, on the unsteady flow and aerodynamics forces of a three dimensional ground vehicle were discussed. The results show that the numerical simulation can effectively simulate the trend of the aerodynamic force. The momentum coefficient can only affect the amplitude of variation in aerodynamic drag, not the tendency of drag variation. The jet obliquity dominates the velocity distribution near the jet exit, which has an influence on the flow separation and leads to the variation of aerodynamic drag. Compared with natural flow, the jet obliquities from -25° to 65° help drag reduction, while the jet obliquities from 80° to 115° make no difference to relevant drag.

 

Key words: ground vehicle; steady blowing; jet direction; flow separation; aerodynamic drag

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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