Author
Rongliang Pan
Bio: Rongliang Pan is an academic researcher from China University of Mining and Technology. The author has contributed to research in topics: Heat flux & Ceiling (cloud). The author has an hindex of 4, co-authored 7 publications receiving 38 citations.
Papers
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TL;DR: In this paper, the maximum temperature of closed utility tunnel ceiling can be predicted by increasing characteristic temperature of smoke based on Li's formula, and the calculated result of the modified formula is in good agreement with the actual value.
22 citations
TL;DR: In this article, the effect of curved sidewall on the fire shape and maximum temperature beneath ceiling centerline was studied in a scaled concrete utility tunnel model with the centerlines of 0, 15, 30, 45 and 60 cm.
19 citations
TL;DR: In this article, the authors investigated the influence of curved sidewall on the maximum temperature and the longitudinal temperature distribution induced by linear fire source in utility tunnel, and a sequence of experiments was conducted in a reduced-scale utility tunnel.
18 citations
TL;DR: In this article, 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.
11 citations
TL;DR: In this paper, the effects of wall spacing on the downward flame spread over polymethyl methacrylate (PMMA) were studied, and the authors found that the average flame height decreases with the increase in distances.
Abstract: To study the effects of spacing on the downward flame spread over polymethyl methacrylate (PMMA), an experiment was conducted by pure PMMA (with 200 mm height, 50 mm width, and 1 mm thickness) with spacings of 7 mm, 10 mm, 13 mm, 16 mm, 19 mm, 22 mm, and 25 mm to observe the flame height, pyrolysis spread rate of fuels, and heat feedback from the wall. The heat feedback received by PMMA was used to analyze the influencing mechanism of wall spacing on flame spread. The results are as follows: (1) The average flame height decreases with the increase in distances (
$$\delta$$
). This decrease in average flame height cycles through two stages: a fast drop stage and a slow drop stage. (2) The average pyrolysis spread rate first increases with the increase in distance, and a maximum pyrolysis spread rate occurred in the 13 mm spacing scenario. Then, the average pyrolysis spread rate decreases monotonously when the distance between wall and sample exceeds 13 mm. (3) The heat flux received by the sample consists of both heat flux from the flame and heat feedback from the wall. With the increase in distance, the heat feedback from the wall follows a downward trend, while the heat flux from the flame first increases and then remains constant. Because of the effects of heat flux from flame and heat feedback from the wall, the heat flux received by the sample first increases and then decreases with the increase in distance.
7 citations
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TL;DR: In this paper, the influence of interlayer distance (d) and cable spacing (s) on flame characteristics and fire hazard of multilayer cables in utility tunnel has been investigated and the results show that large interlayer distances lead to higher flame height but lower flame width.
33 citations
TL;DR: A database that contains all existing experimental data of tunnel fire, based on an extensive literature review on tunnel fire tests is established, and machine learning is applied to predict the critical ventilation velocity of a tunnel fire as a demonstration.
31 citations
TL;DR: In this article, a numerical investigation on the propagation of ceiling gas temperature of thermal plume in a common services tunnel, especially focusing on the influence of the isolated closed-end, which causes significant difference from the traffic tunnel.
23 citations
TL;DR: In this article, an easy-to-use two-dimensional (2D) temperature estimation methodology that is helpful to the designers, operators and firefighters, the temperature distributions and ceiling jet thickness (the vertical distance from the ceiling to where the temperature within the fire-induced smoke flow drops to half of its maximum at a certain location) were investigated with full-scale fire tests in a utility tunnel.
23 citations
TL;DR: Satisfactory results can always be obtained, which shows that the developed algorithm can be used to estimate the tunnel fire source as well as temperature prediction, and it has a very wide popularization and engineering application prospects.
22 citations