期刊
ENERGY
卷 178, 期 -, 页码 378-385出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2019.04.138
关键词
Ceiling jet propagation; Gas temperature distribution; Uncontrolled energy release; Energy detection; Flame-wall interaction
资金
- National Natural Science Foundation of China (NSFC) [51706219, 51722605]
- Fundamental Research Funds for the Central Universities [WK2320000038, WK2320000040]
- National Program for Support of Top-notch Young Professionals
- Youth Innovation Promotion Association of CAS [2015386]
Characteristics of ceiling jets propagation are very significant for energy detecting and controlling once an undesirable energy source releasing flame and toxic pollutant emissions is erupted in a building. In many cases, the impinging ceiling jet flame will be affected by the nearby wall, especially for the energy source very close to or immediately against a wall. Four sets of experiments were conducted with energy source in open space, confined by an unbounded ceiling, confined by a wall-ceiling configuration and confined by two parallel walls (a corridor-like structure). Results show that the impinging ceiling jet flame behaves very differently in different wall-ceiling configurations, the ceiling flame extension and the heat flux to nearby field increases dramatically with increasing confinement strength, from unbounded ceiling to narrow confined corridor-like structure. Based on the limits of flame extension, the temperature distribution under the ceiling can be divided into the near-field region within the ceiling flame and the far-field region beyond the ceiling flame. Predictive correlations of ceiling flame and temperature distribution are proposed to account for different wall-ceiling configurations. The results of this study have implications to optimize the design and arrangement of the ceiling-mounted heat and energy detection, protection and controlling systems. (C) 2019 Elsevier Ltd. All rights reserved.
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