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Weiguang An

Bio: Weiguang An is an academic researcher from China University of Mining and Technology. The author has contributed to research in topics: Flame spread & Combustion. The author has an hindex of 5, co-authored 21 publications receiving 92 citations.

Papers
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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

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TL;DR: In this paper, the influence of vertical channel with various structure factors (α) on downward flame spread over extruded polystyrene (XPS) foam is investigated, and a model is established to predict the total, convective and radiative heat fluxes transferred to preheating zone.

27 citations

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TL;DR: In this paper, an experimental study on combustion and fire safety of energy conservation materials (extruded polystyrene, i.e., XPS) in vertical channel with front openings of building facade is conducted, and effects of channel structure factor and curtain wall coverage rate (β) are revealed.

15 citations

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TL;DR: In this article, the authors investigated the two-sided upward flame behaviors over inclined surfaces by performing experiments using 0.255mm thick, 100 cm tall and 5 cm wide cotton sample sheets with various inclination angles varying 0° to 90° from the horizontal.
Abstract: Most of previous work focused on the one-sided upward flame spread over inclined surfaces. However, few investigations have systematically addressed the dependence of spread rate on the inclination angle for two-sided upward flame spreading. The present paper investigates the two-sided upward flame behaviors over inclined surfaces by performing experiments using 0.255 mm thick, 100 cm tall and 5 cm wide cotton sample sheets with various inclination angles varying 0° to 90° from the horizontal. The pyrolysis spread rate, pyrolysis length, preheating length, ignition time, flame tilt angle and standoff distance are obtained and analyzed. The corresponding results are as follows: As the inclination angle increases, the pyrolysis spread rate, pyrolysis length and preheating length increase, but the ignition time decreases. One transition zone is observed around 10° to 15° for flame spread rate, pyrolysis length and preheating length, which is an external manifestation of the change of flame spread from steady state to acceleration. Two parameters of tilt angle and standoff distance are used to qualitatively modify the heat flux profiles ahead of the flame front, which control the flame spread rate. Generally, the tilt angle and standoff distance of upper flame decrease as a function of inclination angle. On the contrary, the standoff distance shows an opposite trend with inclination angle. The combined effects of radiation and convection of upper and lower flames result in a sharp increase in net heat flux, and correspondingly a transition zone occurs around 10° to 15°. The results of this study have implications concerning designs for fire safety and may help advance understanding of two-sided flame spread over inclined surfaces.

14 citations


Cited by
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TL;DR: In this article, 20 sets of full-scale water mist fire suppression experiments were conducted to examine the impacts of water mist system on smoke temperature characteristics, including water mist activation time (denoted by t), working pressure (P), k-factor (K) and longitudinal wind speed.

38 citations

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TL;DR: In this paper, a modified polyimide (PI) composite foams were in situ generated by introducing modified graphene oxide (GO) based on a novel method to facilitate its dispersion in the PI matrix.
Abstract: Graphene oxide (GO) plays an important role in improving the mechanical properties and flame resistance of materials. In this work, polyimide (PI) composite foams were in situ generated by introducing modified GO based on a novel method. GO was modified by the interaction of its surfactant groups with dopamine (Do) using noncovalent bonds, to facilitate its dispersion in the PI matrix. The π–π conjugation was confirmed between GO and Do. Chemical interactions occurred between GO and PI through the reaction between the active groups on GO and –NCO of isocyanates. The resulting PI composite foams were characterized for their morphological, structural, mechanical, thermal and flame retardant properties. The cell structure of PI composite foams was uniform. Meanwhile, the compressive strength of composite foams significantly increased from 130 kPa to 163 kPa, resulting in a distinct enhancement in mechanical properties. The thermal stability of the composite foams was highly enhanced by GO as evidenced by the decreased mass loss during the maximum decomposition stage and increased residue at 800 °C. Furthermore, the values of limited oxygen index (LOI) of PI foams increased from 42.0% to 44.5%, while the PI composite foams exhibited self-extinguishing property. Therefore the modified GO dramatically improved the mechanical, thermal and flame resistance properties of PI foams.

25 citations

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TL;DR: In this article, the effects of fuel bed width and spacing on the combustion and flame spread behaviors of discrete fuels were investigated. And a prediction model of the mass loss rate was developed, which agreed reasonably well with the experimental data.

24 citations

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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

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TL;DR: In this article , a temperature data-driven bio-inspired artificial intelligence algorithm is developed to detect fire source in 3D space of the underground pipe gallery, in which a simple physical model is used.

20 citations