Drag reduction of high-speed trains via low-density gas injection

Author:

Liang Xifeng123,Luo Zhangjun123,Li Xiaobai123ORCID,Xiong Xiaohui123ORCID,Zhang Xin1234ORCID

Affiliation:

1. Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China

2. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha 410075, China

3. National and Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle, Central South University, Changsha 410075, China

4. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China

Abstract

Aerodynamic drag reduction is crucial for the development of high-speed trains. This study considers the principle of supercavitation torpedo drag reduction and conducts wind tunnel tests and improved delayed detached eddy simulation numerical simulations to develop a drag reduction technique using low-density gas injection on the surface of a high-speed train. Models for jetting gases with different densities on the surface of the high-speed train were employed, and the aerodynamic drag, frictional resistance, pressure resistance, and flow field structure were compared and analyzed. The results demonstrated that jetting of low-density gas reduced the drag of the train, whereas air and high-density gas increased the drag. The jetting gas reduced the frictional resistance of the train to a certain extent and low-density gas injection significantly reduced the frictional resistance. However, the pressure resistance coefficient increased with an increase in the density of the jetting gas, resulting in increased drag. The density of the gas medium in the boundary layer significantly decreased when low-density gas was jetted and the effect of reducing the friction resistance was superior. The pressure resistance between the front and rear of the jet port increased with an increase in the gas density, thereby increasing the drag on the train.

Funder

Central South University

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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