Reducing the aerodynamic drag of high-speed trains by air blowing from the nose part: Effect of blowing speed
Artikel i vetenskaplig tidskrift, 2023

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.

Blowing speed

High-speed train

Flow structure

Aerodynamic drag

Air blowing

Författare

Zheng wei Chen

Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center

Hong Kong Polytechnic University

Guang-Zhi Zeng

Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center

Hong Kong Polytechnic University

Yi-Qing Ni

Hong Kong Polytechnic University

Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center

Tang-Hong Liu

Central South University

Jiqiang Niu

Southwest Jiaotong University

Huadong Yao

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Journal of Wind Engineering and Industrial Aerodynamics

0167-6105 (ISSN)

Vol. 238 105429

Styrkeområden

Transport

Energi

Ämneskategorier

Samhällsbyggnadsteknik

Strömningsmekanik och akustik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1016/j.jweia.2023.105429

Mer information

Senast uppdaterat

2023-05-09