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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Research on aerodynamic drag reduction of vehicle with flow control based on self-excited vibration actuator

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基于自激振动激励器的流动控制汽车减阻研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jun.2024, Vol.47 No.6: 745-752, 772

DOI: 10.3969/j.issn.1003-5060.2024.06.004

Authors

WU Bofu, CHEN Ziqiang, SUN Liang, WU Yaoye, XU Xiao

(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to reduce the aerodynamic drag of traveling vehicles, a self-excited vibration actuator based on the fluid-structure coupling of internal structure was used to generate high-speed, high-frequency pulsed microjet for active flow control. The working process of the actuator was simulated by ANSYS bi-directional fluid-structure coupling method, the velocity and frequency of the pulsed jet produced by the actuator were analyzed, and then the influence of different working parameters and structural parameters on its excitation characteristics was studied. The actuator was arranged along the separation edge of the tail of the Ahmed body model, its influence on the flow topology of the wake area of the body was studied, and its drag reduction effect was analyzed through the air drag coefficient. The results show that the pulsed microjet generated by self-excited vibration actuator is effective in drag reduction, with a drag reduction effect up to 7.12%. The study provides a new idea for drag reduction with active flow control.

Keywords: self-excited vibration actuator; pulsed microjet; active flow control; bi-directional fluid-structure coupling; Ahmed body

作者信息

吴勃夫，陈自强，孙亮，吴姚烨，徐晓

（合肥工业大学汽车与交通工程学院，安徽合肥230009）

摘要和关键词

摘要: 为了降低汽车行驶时的空气阻力,文章采用一种基于内部结构流固耦合的自激振动激励器以产生高速、高频的脉冲微射流进行主动流动控制。通过 ANSYS 双向流固耦合仿真模拟激励器的工作过程,分析其产生的脉冲射流速度和频率,再从不同工作参数和结构参数对其激励特性的影响进行研究;将该激励器沿 Ahmed 类车体模型尾部的分离边缘布置,研究其对车体尾迹区流动拓扑结构的影响,并通过空气阻力系数分析其减阻效果。结果表明,自激振动激励器产生的脉冲微射流可以有效地控制减阻,最高可达 7.12% 的减阻效果。该研究为主动流动控制减阻提供了新思路。

关键词: 自激振动激励器；脉冲微射流；主动流动控制；双向流固耦合；Ahmed 类车体中图分类号：U461.1 文献标志码：A 文章编号：1003-5060（2024）06-0745-09

Funding

国家自然科学基金资助项目（51875150）；合肥市自然科学基金资助项目（2022014）

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