Study on the longitudinal airflow velocity and maximum temperature of the smoke layer under the ceiling in naturally ventilated inclined tunnels

IF 4.7 1区工程技术 Q1 ENGINEERING, INDUSTRIAL

Safety Science Pub Date : 2025-01-28 DOI:10.1016/j.ssci.2025.106795

Jiayun Sun , Wenyu Liu , Junheng Wang , Zhi Tang

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引用次数: 0

Abstract

This study investigates the inlet airflow velocity and the maximum temperature of the smoke layer underneath the ceiling in naturally ventilated inclined tunnels by means of CFD simulations and theoretical analysis. The findings of this research indicate that the chimney-effect induced inlet airflow velocity is proportional to the

1 / 3

power of the tunnel height difference (

Δ h

) and fire heat release rate (HRR). However, the smoke stratification occurring downstream of the fire source exerts a significant influence on the inlet airflow velocity. It is also illustrated that the maximum temperature of the smoke layer underneath the tunnel ceiling highly depends on the HRR and tunnel height difference, rather than being solely determined by the tunnel slope. The position of the maximum temperature is found to be closely related to the tunnel height difference, but independent of HRR. A predictive model has been devised to estimate the maximum smoke temperature underneath the tunnel ceiling. Comparative study of the smoke maximum temperature between naturally ventilated inclined tunnels and longitudinal ventilated horizontal tunnels shows that the influence of fire heat release rate on the smoke maximum temperature of inclined tunnels is less pronounced than that of horizontal tunnels.

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来源期刊

Safety Science 管理科学-工程：工业

CiteScore

13.00

自引率

9.80%

发文量

335

审稿时长

53 days

期刊介绍： Safety Science is multidisciplinary. Its contributors and its audience range from social scientists to engineers. The journal covers the physics and engineering of safety; its social, policy and organizational aspects; the assessment, management and communication of risks; the effectiveness of control and management techniques for safety; standardization, legislation, inspection, insurance, costing aspects, human behavior and safety and the like. Papers addressing the interfaces between technology, people and organizations are especially welcome.