Effect of combined side-wall air supply on ventilation and respiratory pollutant dispersion characteristics of high-speed trains

Abstract

The ventilation system significantly affects the energy saving, thermal comfort, and pollutant dispersion characteristics of high-speed trains. Using Computational Fluid Dynamics (CFD), the effects of combining side-wall air supply with side roof or ceiling air supply, on the performance of a high-speed train ventilation system is studied. The results show that the addition of side-wall air supply aids energy saving and emission reduction, resulting in an increase in energy utilisation coefficient of between 5% and 30%. The number of measurement points with wind speed less than 0.3 m/s increases by 3%∼9%, which can improve passenger comfort. Also, the concentration of pollutants can be reduced by 6%∼29%, and the diffusion distance along the length of the train can be reduced by 18%∼45%, which means more efficient ventilation and a shorter diffusion range of pollutants. However, it reduces temperature uniformity. The results of this study can be used for ventilation optimisation of high-speed trains, to reduce ventilation energy consumption, improve thermal comfort, and increase ventilation efficiency.

KEYWORDS:

• High-speed trains
• ventilation
• energy saving
• thermal comfort
• ventilation efficiency

Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 12372049), Science and Technology Program of China National Accreditation Service for Conformity Assessment (No. 2022CNAS15), the Fundamental Research Funds for the Central Universities (No. 2682021ZTPY124) and Independent Project of State Key Laboratory of Rail Transit Vehicle System (No. 2023TPL-T06).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China (No. 12372049), Sichuan Science and Technology Program (No. 2023NSFSC0904) and State Key Laboratory of Traction Power (No. 2023TPL-T06).