Journal
APPLIED THERMAL ENGINEERING
Volume 111, Issue -, Pages 248-256Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.09.064
Keywords
Tunnel fires; Mechanical ventilation tunnel; Ceiling extraction; Smoke layer thickness; Plug-holing
Funding
- National Nature Science Funds of China [51406046, 71431003]
- Anhui Provincial Natural Science Foundation of China [1508085QE84]
- Fundamental Research Funds for the Central Universities [JZ2016HGTB0713]
- National Thirteenth Five-Year Key Research and Development Program [2016YFC0800603]
- Opening Fund of State key Laboratory of Fire Science [HZ2015-KF06]
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A series of burning experiments were conducted in a model-scale mechanical ventilation tunnel to study the characteristics of smoke layer thickness and plug-holing with multiple point extraction system. Hot-wire anemometer and thermocouples trees were used to measure the flow velocity of ventilation outlet and vertical temperature profile in a mechanical ventilation tunnel, respectively. It was found that the smoke layer thickness was calculated by integral ratio method and within-class variance method were good agreement with visual observation value. The normalized temperature curves can be divided into two regions, such as, the plug-holing and without plug-holing. The smoke plug-holing exhaust rate and the d/H ratio of smoke layer depth to clear height decreased with increasing the number of point extraction opening for a given HRR. (C) 2016 Elsevier Ltd. All rights reserved.
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