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The mobile fan, as a portable smoke exhaust device, serves as an essential backup for smoke control when fixed smoke exhaust systems fail. This paper analyzes the wind field characteristics, wind speed, and wind pressure generated by various combinations of mobile fans(differing in the number of fans, spacing, and lifting height) within a tunnel through numerical simulation methods. The aim is to explore the smoke exhaust capabilities of the combined mobile smoke exhaust system in tunnel environments. The research findings indicate that the lift pressure produced by the combined fans in the tunnel results from the interference and mutual interaction of each fan's jet development. Notably, the actual increase in lift pressure does not follow a simple linear relationship with the number of fans. As the number of fans increases, the boost coefficient of the combined fan also rises, demonstrating that more fan energy is converted into the kinetic energy of the airflow within the tunnel. Conversely, increasing the spacing between the mobile fans reduces the interaction between multiple jets generated by the fans, which subsequently decreases the actual lift pressure and boost coefficient. When forming the fan matrix combination, appropriately elevating the height of the fan matrix enhances the uniformity of the induced airflow over shorter distances, thereby improving the stable wind speed in the pressure ventilation section. Under the conditions investigated in this study, the boost coefficient provided by the combined mobile fan ranged from 0.20 to 0.36. Based on these conclusions, recommendations for optimizing the configuration of the combined mobile smoke exhaust system are proposed. This study provides a foundation for the practical application of mobile fans in tunnels and offers valuable insights for the implementation of mobile smoke gas control equipment.
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Basic Information:
DOI：10.13637/j.issn.1009-6094.2025.1447
China Classification Code:U453.5
Citation Information:
[1]Xiao Feng,Li Yuanzhe,Zhang Jiaqing ,et al.Research on the tunnel wind field characteristics induced by mobile fans and optimization of fan combination[J].Journal of Safety and Environment,2026,26(08):3009-3019.DOI:10.13637/j.issn.1009-6094.2025.1447.
Fund Information:
四川省自然科学基金项目(2025ZNSFSC1363); 国家消防救援局科技计划项目(2023XFCX16); 自动驾驶技术交通运输行业研发中心开放基金项目
2026-08-19
2026-08-19