期刊
CASE STUDIES IN THERMAL ENGINEERING
卷 23, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.csite.2020.100804
关键词
Portals-sealed arced tunnel; Linear fire source; Dimensional analysis; Effective ceiling height; Maximum temperature rise; Longitudinal temperature distribution
资金
- National Key R&D Program of China [2016YFC0802900]
Experimental tests were conducted in a portals-sealed arched tunnel to investigate maximum gas temperature rise and longitudinal temperature distribution. A new empirical formula was proposed to predict the maximum excess temperature beneath the ceiling. The study shows an exponential decay relationship between the non-dimensional maximum excess temperature and non-dimensional fuel tank length, and presents longitudinal temperature distribution using two exponential equations.
A set of experimental tests were conducted to investigate the maximum gas temperature rise and longitudinal temperature distribution beneath the centerline ceiling in a portals-sealed arched tunnel, taking fuel tank central angle location along the sidewall (expressed by effective ceiling height) and linear fire size into account. A linear fuel tank burner, placed on the arched sidewall of the tunnel, was utilized to simulate the fire source. A new empirical formula was proposed to predict the maximum excess temperature beneath the ceiling in a portals-sealed tunnel fire, based on dimensional analysis. The experimental results show that the non-dimensional maximum excess temperature has an exponential decaying relationship with non-dimensional fuel tank length. A predecessor's equation is modified to present the longitudinal temperature distribution beneath the centerline of arced-ceiling in a portals-sealed tunnel fire, which is consists of the sum of two exponential equations. The comparison of longitudinal temperature distribution between fire in portals-sealed tunnel and natural ventilation tunnel was conducted. The study is expected to provide some references for actual tunnel fire-fighting.
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