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Wind and Structures Volume 34, Number 5, May 2022 , pages 451-467 DOI: https://doi.org/10.12989/was.2022.34.5.451 |
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Numerical investigation of the influence of structures in bogie area on the wake of a high-speed train |
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Dongwei Wang, Chunjun Che and Zhiying He
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| Abstract | ||
| The flow around a high-speed train with three underbody structures in the bogie area is numerically investigated using the improved delayed detached eddy simulation method. The vortex structure, pressure distribution, flow field structure, and unsteady velocity of the wake are analyzed by vortex identification criteria Q, frequency spectral analysis, empirical mode decomposition (EMD), and Hilbert spectral analysis. The results show that the structures of the bogie and its installation cabin reduce the momentum of fluid near the tail car, thus it is easy to induce flow separation and make the fluid no longer adhere to the side surface of the train, then forming vortices. Under the action of the vortices on the side of the tail car, the wake vortices have a trend of spanwise motion. But the deflector structure can prevent the separation on the side of the tail car. Besides, the bogie fairings do not affect the formation process and mechanism of the wake vortices, but the fairings prevent the low-speed fluid in the bogie installation cabin from flowing to the side of the train and reduce the number of the vortices in the wake region. | ||
| Key Words | ||
| bogie; EMD; high-speed train; improved delayed detached eddy simulation; wak | ||
| Address | ||
| Dongwei Wang:School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China Chunjun Che:1)School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China 2)Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu, 610031, China Zhiying He:School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China | ||