The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude

The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude

Conventional correlations for the maximum temperature under a ceiling were mainly developed based on the experimental results at atmospheric pressure. For high-altitude environment with lower ambient pressure, their feasibility needs to be reexamined. In this paper, a sequence of pool fires with dif...

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Main Authors: Liu Jiahao, Zhou Zhihui, Wang Jian, Xie Qimiao, Wang Jinhui, Yuen Richard
Format: Article
Language:English
Published: VINCA Institute of Nuclear Sciences 2019-01-01
Series:Thermal Science
Subjects:
maximum excess temperature
high-altitude environment
pool fire
ceiling jet
Online Access:http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361800075L.pdf
id doaj-871c2218277b45798bef52fce6ef2c0b
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spelling doaj-871c2218277b45798bef52fce6ef2c0b2021-01-02T09:56:51ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362019-01-01235 Part B2961297010.2298/TSCI170926075L0354-98361800075LThe maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitudeLiu Jiahao0Zhou Zhihui1Wang Jian2Xie Qimiao3Wang Jinhui4Yuen Richard5Shanghai Maritime University, College of Ocean Science and Engineering, Shanghai, ChinaChina Waterborne Transport Research Institute, Beijing, ChinaUniversity of Science and Technology of China, State Key Laboratory of Fire Science, Hefei, ChinaShanghai Maritime University, College of Ocean Science and Engineering, Shanghai, ChinaShanghai Maritime University, College of Ocean Science and Engineering, Shanghai, ChinaCity University of Hong Kong, Department of Architecture and Civil Engineering, Hong Kong, ChinaConventional correlations for the maximum temperature under a ceiling were mainly developed based on the experimental results at atmospheric pressure. For high-altitude environment with lower ambient pressure, their feasibility needs to be reexamined. In this paper, a sequence of pool fires with different dimensions and fuel types was performed under a horizontal unconfined ceiling to measure the maximum excess temperature in a high-altitude city, Lhasa (3650 m / 64.3 kPa). The results show that the maximum smoke temperatures beneath the ceiling at high altitude are significant higher than the predicted values by Alpert’s model. Considering the effects of ambient pressure and entrainment coefficient, a new theoretical model for predicting the maximum excess temperature was proposed based on the ideal plume assumption. The current results together with the data in the literature which conform with Alpert’s model successfully converge by employing the proposed correlation.http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361800075L.pdfmaximum excess temperaturehigh-altitude environmentpool fireceiling jet
collection DOAJ
language English
format Article
sources DOAJ
author Liu Jiahao
Zhou Zhihui
Wang Jian
Xie Qimiao
Wang Jinhui
Yuen Richard
spellingShingle Liu Jiahao
Zhou Zhihui
Wang Jian
Xie Qimiao
Wang Jinhui
Yuen Richard
The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
Thermal Science
maximum excess temperature
high-altitude environment
pool fire
ceiling jet
author_facet Liu Jiahao
Zhou Zhihui
Wang Jian
Xie Qimiao
Wang Jinhui
Yuen Richard
author_sort Liu Jiahao
title The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
title_short The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
title_full The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
title_fullStr The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
title_full_unstemmed The maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
title_sort maximum excess temperature of fire-induced smoke flow beneath an unconfined ceiling at high altitude
publisher VINCA Institute of Nuclear Sciences
series Thermal Science
issn 0354-9836
publishDate 2019-01-01
description Conventional correlations for the maximum temperature under a ceiling were mainly developed based on the experimental results at atmospheric pressure. For high-altitude environment with lower ambient pressure, their feasibility needs to be reexamined. In this paper, a sequence of pool fires with different dimensions and fuel types was performed under a horizontal unconfined ceiling to measure the maximum excess temperature in a high-altitude city, Lhasa (3650 m / 64.3 kPa). The results show that the maximum smoke temperatures beneath the ceiling at high altitude are significant higher than the predicted values by Alpert’s model. Considering the effects of ambient pressure and entrainment coefficient, a new theoretical model for predicting the maximum excess temperature was proposed based on the ideal plume assumption. The current results together with the data in the literature which conform with Alpert’s model successfully converge by employing the proposed correlation.
topic maximum excess temperature
high-altitude environment
pool fire
ceiling jet
url http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361800075L.pdf
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