Abstract
In a subway environment control system without screen doors, the tunnel piston wind enters the platform with the train and significantly affects the platform’s thermal environment. The piston wind distributed on the platform here is defined as the platform piston wind. In this case, the diffusion regularity of platform piston wind is regarded as a wall jet along the platform’s length and width, and its origin is a piston wind jet at the tunnel exit. According to classical wall jet theory, the jet can be approximately divided into initial and main sections in the development process. This study is based on the mathematical theory model. The model divided the platform piston wind velocity distribution into the initial section and the main section. This platform piston wind mathematical theory model is solved with time circle and along the vertical wall directions. The various conditions include changing the tunnel cross sections, train cross sections, the maximum train velocities. It is concluded that the cross-sectional ratio and maximum train velocities are the main factors on this velocities distribution. The building up and solution of this platform piston wind mathematical model serve as an important reference for the optimal design of practical thermal environments in engineering.
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References
Saiben M (1971) Fluid mechanics of train-tunnel systems in unsteady motion. AIAA J 9:1538–1545
Kim JY, Kim KY (2007) Experimental and numerical analyses of train induced unsteady tunnel flow in subway. Tunn Undergr Space Technol 22:166–172
Huang YD (2012) A numerical analysis of the ventilation performance for different ventilation strategies in a subway tunnel. J Hydrodyn 24:193–201
Wang LH, Wu XP (2007) The effect on the subway system from the piston action wind. Chin J Undergr Space Eng 3:161–166
Yuan FD, You SJ (2007) CFD simulation and optimization of the ventilation for subway side-platform. Tunn Undergr Space Technol 22:474–482
Wang LH, Li Z, et al (2011) A measurement analysis of subway thermal environment characteristics of the coupling airflow between air-conditioning air supply and piston wind. J Chongqing Univ 34:116–121
Shen X, Wu XP, Dong ZhZh (2005) Character testing of piston wind in a underground railway tunnel. HV&AC 35:103–106
Shen X (2001) Underground railroad piston wind characteristics. Master dissertation in Tongji University
Acknowledgments
The research was funded by National Natural Science Foundation of China (50908147, 51278302) and the Leading Academic Discipline Project of Shanghai Municipal Education Commission (J50502).
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© 2014 Springer-Verlag Berlin Heidelberg
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Wang, L., Chen, R., Du, X., Song, J. (2014). The Platform Piston Wind Velocity Variation Analysis with Different Conditions. In: Li, A., Zhu, Y., Li, Y. (eds) Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning. Lecture Notes in Electrical Engineering, vol 261. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39584-0_54
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DOI: https://doi.org/10.1007/978-3-642-39584-0_54
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