Reducing the aerodynamic drag of high-speed trains by air blowing from the nose part: Effect of blowing speed

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Chen, Zheng weiHong Kong Polytechnic University (author)

Reducing the aerodynamic drag of high-speed trains by air blowing from the nose part: Effect of blowing speed

Article/chapterEnglish2023

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2023
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LIBRIS-ID:oai:research.chalmers.se:16391637-ec4a-4138-81d1-17f0cef56fc3
https://doi.org/10.1016/j.jweia.2023.105429DOI
https://research.chalmers.se/publication/535509URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

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To reduce the aerodynamic drag of high-speed trains, this work proposes an air blowing configuration on the head and tail cars of high-speed trains. The variation in the aerodynamic drag and slipstream velocity is analyzed under different blowing velocities, and the flow mechanism for train aerodynamic performance alteration is explained. The results show that under the blowing speeds of Ub = 0.05Ut, 0.10Ut, 0.15Ut, and 0.20Ut, where Ut is the train speed, the total drag coefficient (Cd) decreases by 5.81%, 10.78%, 13.70%, and 15.43% compared to the without-blowing case, respectively. However, with the increase in the blowing speed, the reduction trend of Cd tends to be smoother; namely, the decrement ratio compared to the previous blowing speed for the head car is 9.08%, 0.11%, 0.60%, and 1.14% for Ub = 0.05Ut, 0.10Ut, 0.15Ut, and 0.20Ut, respectively. The blowing measure generates an air gap between the coming flow and train surface, consequently causing a reduction in the viscous and pressure drag. In addition, the structure size and strength of the wake flow under different blowing cases show a decreasing trend from Ub = 0.00Ut to 0.10Ut and then an increasing trend from Ub = 0.10Ut to 0.20Ut. Thus, considering the blowing cost, efficiency, and flow structure evolution comprehensively, the case of Ub = 0.10Ut is recommended. Under this blowing speed, the reduction ratio of the aerodynamic drag is 9.18%, 12.77%, 10.90%, and 10.78% for the head, middle, tail car, and total train, respectively.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
Blowing speed
High-speed train
Flow structure
Aerodynamic drag
Air blowing

Added entries (persons, corporate bodies, meetings, titles ...)

Zeng, Guang-ZhiHong Kong Polytechnic University (author)
Ni, Yi-QingHong Kong Polytechnic University (author)
Liu, Tang-HongCentral South University (author)
Niu, JiqiangSouthwest Jiaotong University (author)
Yao, Huadong,1982Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)huadong (author)
Hong Kong Polytechnic UniversityCentral South University (creator_code:org_t)

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In:Journal of Wind Engineering and Industrial Aerodynamics2380167-6105

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By the author/editor: Chen, Zheng wei; Zeng, Guang-Zhi; Ni, Yi-Qing; Liu, Tang-Hong; Niu, Jiqiang; Yao, Huadong, 19 ...

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