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Research on transient aerodynamic characteristics of windshield wipers of vehicles

Zhen Chen (School of Traffic and Transportation Engineering, Central South University, Changsha, China; Key Laboratory of Traffic Safety on Track, Ministry of Education, Central South University, Changsha, China and Joint International Research Laboratory of Traffic Safety on Track, Central South University, Changsha, China)
Zhenqqi Gu (State Key Laboratory of Advanced Design and Manufacture for Vehicle, Changsha, China)
Tao Jiang (School of Automotive Engineering, Wuhan University of Technology, Wuhan China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 August 2019

Abstract

Purpose

The main purpose of this paper is to gain a better understanding of the transient aerodynamic characteristics of moving windshield wipers. In addition, this paper also strives to illustrate and clarify how the wiper motion impacts the airflow structure; the aerodynamic interaction of two wipers is also discussed.

Design/methodology/approach

A standard vehicle model proposed by the Motor Industry Research Association and a pair of simplified bone wipers are introduced, and a dynamic mesh technique and user-defined functions are used to achieve the wiper motion. Finite volume methods and large eddy simulation (LES) are used to simulate the transient airflow field. The simulation results are validated through the wind tunnel test.

Findings

The results obtained from the study are presented graphically, and pressure, velocity distributions, airflow structures, aerodynamic drag and lift force are shown. Significant influences of wiper motion on airflow structures are achieved. The maximum value of aerodynamic lift and drag force exists when wipers are rotating and there is a certain change rule. The aerodynamic lift and drag force when wipers are rotating downward is greater than when wipers are rotating upward, and the force when rotating upward is greater than that when steady. The aerodynamic lift and drag forces of the driver-side wiper is greater than those of the passenger-side wiper.

Originality/value

The LES method in combination with dynamic mesh technique to study the transient aerodynamic characteristics of windshield wipers is relatively new.

Keywords

Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 50975083; Postdoctoral Fund of Central South University under Grant No. 205441; and National Key Research and Development Program of China under Grant No. 2017YFB1201103-02.

Citation

Chen, Z., Gu, Z. and Jiang, T. (2019), "Research on transient aerodynamic characteristics of windshield wipers of vehicles", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 8, pp. 2870-2884. https://doi.org/10.1108/HFF-09-2018-0531

Publisher

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Emerald Publishing Limited

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