TY - JOUR
T1 - A suction method to mitigate pressure waves induced by high-speed maglev trains passing through tunnels
AU - Chen, Zheng Wei
AU - Guo, Zhan Hao
AU - Ni, Yi Qing
AU - Liu, Tang Hong
AU - Zhang, Jie
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 52202426 , 52105523 ), the Open Project of Key Laboratory of Traffic Safety on Track of Ministry of Education, Central South University (Grant No. 502401002 ), Start-up Fund for RAPs under the Strategic Hiring Scheme of The Hong Kong Polytechnic University (Grant No. 1-BD23), the Natural Science Foundation of Hunan Province, China (Grant No. 2020JJ4737 ), the Natural Science Foundation of Shandong (Grant No. ZR2021QE249 ). The work described in this paper was also supported by a grant (RIF) from the Research Grants Council of the Hong Kong Special Administrative Region (SAR), China (Grant No. R-5020-18) and a grant from the National Natural Science Foundation of China (Grant No. U1934209 ). The authors would also like to appreciate the funding support by the Innovation and Technology Commission of the Hong Kong SAR Government (Grant No. K-BBY1 ), and the Hong Kong and Macau Joint Research and Development Fund of Wuyi University (Grants No. 2019WGALH15 , 2019WGALH17 , 2021WGALH15 ), and Guangdong Basic and Applied Basic Research Fund for Guangdong-Hong Kong-Macao Research Team Project (Grant No. 2021B1515130006).
Publisher Copyright:
© 2023 The Author(s)
PY - 2023/9
Y1 - 2023/9
N2 - When a high-speed maglev train travels through a tunnel, sudden pressure changes are generated in the tunnel, which have a negative impact on the comfort of passengers and the service life of equipment. Moreover, a strong micro-pressure wave is radiated, causing environmental noise at the tunnel exit. Using the unsteady compressible Reynolds-averaged Navier–Stokes equations based on the shear stress transport k-ω turbulence model, this study investigates the effectiveness of suction (deployed on the tunnel wall) to mitigate the pressure waves and compares the results obtained under different suction velocities. The results show that when the suction is actuated, a low-pressure region is generated near the suction slots, which can trim down the initial compression wave and the high-pressure region in front of the train. Moreover, the instantaneous train surface pressure, tunnel surface pressure and micro-pressure wave have a significant relationship with the suction velocity. For instance, compared to the no suction case, the suction-actuated case with the suction velocity of 50 m/s contributes to an amplitude reduction of 10.44% and 30.61% for the first and second sudden pressure changes, respectively, at train surface measuring point H1 (at the nose of the train); an amplitude reduction of more than 14% for the sudden pressure change at tunnel surface measuring point T17 (at the middle of the tunnel); and an amplitude reduction of 12.44% for the micro-pressure wave at measuring point M2 (outside the tunnel and 20 m from the tunnel exit). These indicate that the suction technique can be employed to alleviate the tunnel aerodynamic effect. Also, the results obtained under different suction velocities can serve as a guide for the design of suction actuators.
AB - When a high-speed maglev train travels through a tunnel, sudden pressure changes are generated in the tunnel, which have a negative impact on the comfort of passengers and the service life of equipment. Moreover, a strong micro-pressure wave is radiated, causing environmental noise at the tunnel exit. Using the unsteady compressible Reynolds-averaged Navier–Stokes equations based on the shear stress transport k-ω turbulence model, this study investigates the effectiveness of suction (deployed on the tunnel wall) to mitigate the pressure waves and compares the results obtained under different suction velocities. The results show that when the suction is actuated, a low-pressure region is generated near the suction slots, which can trim down the initial compression wave and the high-pressure region in front of the train. Moreover, the instantaneous train surface pressure, tunnel surface pressure and micro-pressure wave have a significant relationship with the suction velocity. For instance, compared to the no suction case, the suction-actuated case with the suction velocity of 50 m/s contributes to an amplitude reduction of 10.44% and 30.61% for the first and second sudden pressure changes, respectively, at train surface measuring point H1 (at the nose of the train); an amplitude reduction of more than 14% for the sudden pressure change at tunnel surface measuring point T17 (at the middle of the tunnel); and an amplitude reduction of 12.44% for the micro-pressure wave at measuring point M2 (outside the tunnel and 20 m from the tunnel exit). These indicate that the suction technique can be employed to alleviate the tunnel aerodynamic effect. Also, the results obtained under different suction velocities can serve as a guide for the design of suction actuators.
KW - High-speed maglev train
KW - Micro-pressure wave
KW - Suction method
KW - Sustainable cities
KW - Tunnel
UR - http://www.scopus.com/inward/record.url?scp=85163065604&partnerID=8YFLogxK
U2 - 10.1016/j.scs.2023.104682
DO - 10.1016/j.scs.2023.104682
M3 - Journal article
AN - SCOPUS:85163065604
SN - 2210-6707
VL - 96
JO - Sustainable Cities and Society
JF - Sustainable Cities and Society
M1 - 104682
ER -