Study on the confinement velocity in centralized smoke exhaust mode with top double vents

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-02-13 DOI:10.1016/j.tust.2025.106463

Shengyuan Chen , Xuepeng Jiang , Qirui Wang

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引用次数: 0

Abstract

The confinement velocity in centralized smoke exhaust mode with top double vents is investigated through reduced-scale experiments and numerical simulations. An equation for calculating the dimensionless confinement velocity and smoke back-layering length in this mode is derived from theoretical analysis, model experiments, and numerical simulations. The findings indicate distinct confinement velocity transition points for both normal-type and slit-type smoke vents, and that both sensitive and insensitive areas increase with the increase of fire source heat release rate. For the normal-type smoke vent, the confinement velocity to total confinement velocity ratio is approximately 0.6, with the smoke back-layering length to tunnel hydraulic diameter ratio around 3. For the slit-type smoke vent, these ratios are approximately 0.85 and 2, respectively. The ratio can be calculated to get the corresponding confinement velocities and smoke back-layering lengths. The confinement velocity and total confinement velocity for the slit-type smoke vent are lower than those for the normal-type, demonstrating a more significant smoke control effect and superior exhaust performance.

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.