Aerodynamic performance of a high-speed train passing through three standard tunnel junctions under crosswinds
Artikel i vetenskaplig tidskrift, 2020
The aerodynamic performance of a high-speed train passing through tunnel junctions under severe crosswind condition was numerically investigated using improved delayed detached-eddy simulations (IDDES). Three ground scenarios connected with entrances and exits of tunnels were considered. In particular a flat ground, an embankment, and a bridge configuration were used. The numerical method was first validated against experimental data, showing good agreement. The results show that the ground scenario has a large effect on the train's aerodynamic performance. The bridge case resulted in generally smaller drag and lift, as well as a lower pressure coefficient on both the train body and the inner tunnel wall, as compared to the tunnel junctions with flat ground and embankment. Furthermore, the bridge configuration contributed to the smallest pressure variation in time in the tunnel. Overall, the study gives important insights on complicated tunnel junction scenarios coupled with severe flow conditions, that, to the knowledge of the authors, were not studied before. Beside this, the results can be used for further improvements in the design of tunnels where such crosswind conditions may occur.
IDDES
Tunnel junction
High-speed train
Numerical simulation
Crosswind
Författare
Xiujuan Miao
Changsha University of Science and Technology
Kan He
Central South University
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
Guglielmo Minelli
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Jie Zhang
Central South University
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
Guangjun Gao
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
Central South University
Hongliang Wei
CRRC Corporation
Maosheng He
CRRC Corporation
Sinisa Krajnovic
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Applied Sciences (Switzerland)
20763417 (eISSN)
Vol. 10 11 3664Ämneskategorier (SSIF 2011)
Geoteknik
Farkostteknik
Strömningsmekanik och akustik
DOI
10.3390/app10113664