Study on the smoke sealing efficiency of air curtain and maximum ceiling temperature rise under longitudinal ventilation in bifurcated tunnel

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2024-12-26 DOI:10.1016/j.ijheatfluidflow.2024.109711

Tao Li , Zhengquan Chen , Wenxuan Zhao , Jianing Yuan , Chunxiang Wang , Yuchun Zhang

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引用次数: 0

Abstract

Due to the ever-growing development and construction of municipalities, the underground tunnel structures raises the probability of traffic accidents and the fire risks. The effects of different longitudinal ventilation velocities and air curtain spouting angles (ASA) on the temperature distribution and maximum ceiling temperature rise in a scaled bifurcated tunnel were investigated experimentally and numerically with different heat release rates. Induced by synergistic effect of longitudinal ventilation and air curtain, the maximum ceiling temperature in the fire zone was shifted. The high temperature ranges of ceiling expanded as ASA increased. The smoke sealing effect (SSE) of different ASA ranged from 0.6 to 0.82, and the 15 ° showed a more stable SSE. Besides, based on the Li model, the factor

θ

of ASA was introduced for predicting the maximum ceiling temperature rise, which is consistent with the experimental data. Comparison between the experiments and the simulations showed good agreement.

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.