Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical study for the aerodynamic performance of double unit train under crosswind
Abstract The present work focused on the aerodynamic performance of double unit trains (DUT) and traditional single unit trains (SUT) under crosswinds. The aerodynamic coefficient as well as the characteristics of the time-averaged and instantaneous flow of the SUT and DUT were calculated using the improved delayed detached eddy simulation (IDDES) method for 1/8th scale models. The numerical results were verified by wind tunnel tests. The time-averaged flow pattern on different cross-sections and horizontal planes were compared for the SUT and DUT. The pressure coefficients on the loops of different cars were also analyzed quantitatively. The vortices around the SUT and DUT were visualized, and the frequency characteristics of each car of the SUT and DUT were computed. The coupling region changed the forces on the train and increased the overall drag of the train. Faster vortex development was found on the last three cars of the DUT. Furthermore, a higher velocity belt was generated by the gap of the coupling region. The coupling region gave a significant influence of the power spectrum densities (PSD) on the last four cars and a relatively slight impact on the first two cars.
Highlights The aerodynamic forces of double unit trains under crosswind. Leeward time-averaged flow patterns projected on different y-z planes. Velocity distribution on horizontal planes of at different heights. Ringed Pressure coefficients on train surface along the train length. Different instantaneous characteristics between the SUT and DUT.
Numerical study for the aerodynamic performance of double unit train under crosswind
Abstract The present work focused on the aerodynamic performance of double unit trains (DUT) and traditional single unit trains (SUT) under crosswinds. The aerodynamic coefficient as well as the characteristics of the time-averaged and instantaneous flow of the SUT and DUT were calculated using the improved delayed detached eddy simulation (IDDES) method for 1/8th scale models. The numerical results were verified by wind tunnel tests. The time-averaged flow pattern on different cross-sections and horizontal planes were compared for the SUT and DUT. The pressure coefficients on the loops of different cars were also analyzed quantitatively. The vortices around the SUT and DUT were visualized, and the frequency characteristics of each car of the SUT and DUT were computed. The coupling region changed the forces on the train and increased the overall drag of the train. Faster vortex development was found on the last three cars of the DUT. Furthermore, a higher velocity belt was generated by the gap of the coupling region. The coupling region gave a significant influence of the power spectrum densities (PSD) on the last four cars and a relatively slight impact on the first two cars.
Highlights The aerodynamic forces of double unit trains under crosswind. Leeward time-averaged flow patterns projected on different y-z planes. Velocity distribution on horizontal planes of at different heights. Ringed Pressure coefficients on train surface along the train length. Different instantaneous characteristics between the SUT and DUT.
Numerical study for the aerodynamic performance of double unit train under crosswind
Guo, Zijian (Autor:in) / Liu, Tanghong (Autor:in) / Yu, Miao (Autor:in) / Chen, Zhengwei (Autor:in) / Li, Wenhui (Autor:in) / Huo, Xiaoshuai (Autor:in) / Liu, Hongkang (Autor:in)
Journal of Wind Engineering and Industrial Aerodynamics ; 191 ; 203-214
19.06.2019
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Numerical calculations of aerodynamic performance for ATM train at crosswind conditions
| Online Contents | 2014
| Taylor & Francis Verlag | 2024
Analysis of high-speed train flow structures under crosswind
| British Library Online Contents | 2016