Experimental Investigation on the Discharge of Pollutants from Tunnel Fires
| Autor: | Jiaming Zhao, Xu Zhisheng, Guanhong He, Baochao Xie, Lihua Zhai, Zhongxing Nong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
heat exhaust coefficient
Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena pollutant control Geography Planning and Development lcsh:TJ807-830 0211 other engineering and technologies lcsh:Renewable energy sources Stratification (water) 020101 civil engineering 02 engineering and technology Management Monitoring Policy and Law 0201 civil engineering Condensed Matter::Superconductivity Buoyant flow Smoke flow lcsh:Environmental sciences 021101 geological & geomatics engineering Pollutant Smoke lcsh:GE1-350 tunnel fire Quantitative Biology::Neurons and Cognition Renewable Energy Sustainability and the Environment musculoskeletal neural and ocular physiology lcsh:Environmental effects of industries and plants Mechanics Toxic gas Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Layer thickness smoke layer height lcsh:TD194-195 nervous system Environmental science |
| Zdroj: | Sustainability, Vol 12, Iss 5, p 1817 (2020) Sustainability Volume 12 Issue 5 |
| ISSN: | 2071-1050 |
| Popis: | Many pollutants are generated during tunnel fires, such as smoke and toxic gases. How to control the smoke generated by tunnel fires was focused on in this paper. A series of experiments were carried out in a 1:10 model tunnel with dimensions of 6.0 m × 1.0 m × 0.7 m. The purpose was to investigate the smoke layer thickness and the heat exhaust coefficient of the tunnel mechanical smoke exhaust mode under longitudinal wind. Ethanol was employed as fuel, and the heat release rates were set to be 10.6 kW, 18.6 kW, and 31.9 kW. The exhaust velocity was 0.32&ndash 3.16 m/s, and the longitudinal velocity was 0&ndash 0.47 m/s. The temperature profile in the tunnel was measured, and the buoyant flow stratification regime was visualized by a laser sheet. The results showed that the longitudinal ventilation leads to a secondary stratification of the smoke flow. In the ceiling extract tunnel under longitudinal ventilation, considering the research results of the smoke layer height and the heat exhaust coefficient, a better scheme for fire-producing pollutants was that an exhaust velocity of 1.26&ndash 2.21 m/s (corresponding to the actual velocity of 4.0&ndash 7.0 m/s) should be used. The longitudinal velocity should be 0.16&ndash 0.32 m/s (corresponding to the actual velocity of 0.5&ndash 1.0 m/s). |
| Databáze: | OpenAIRE |
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