Affiliation:
1. Sichuan Fire Research Institute of MEM, Chengdu 610036, China
2. China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400067, China
Abstract
In this study, a tunnel model with a length of 20 m, a width of 5 m, and a height of 5 m was used, and an experimental investigation was conducted to examine the impact of high-pressure water mist on the temperature distribution along the tunnel ceiling. Specifically, different experimental settings, such as various nozzle pressures, nozzle positions, and longitudinal ventilation speeds, in the high-pressure water mist system were employed to investigate the smoke-spreading process of tunnel fire under different conditions, and an effective method utilizing a high-pressure water mist system was proposed for blocking smoke and heat. The experimental results reveal that the high-pressure water mist system can be used to effectively improve the ceiling temperature during tunnel fires; when the nozzle pressure is set as 10 MPa, and the nozzle position is located at x7, the highest thermal insulation efficiency in the tunnel is obtained. Additionally, the joint application of the high-pressure water mist system and the mechanical smoke exhaust effectively mitigates the ambient temperature within the tunnel, thereby playing a pivotal role in enhancing the fire safety of the tunnel.
Funder
Sichuan Science and Technology Program
National Key R&D Program of China
Sichuan Fire Research Institute of MEM Science and Technology Projects
Natural Science Foundation of Chongqing Municipality
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