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Xueqiang Liu

Bio: Xueqiang Liu is an academic researcher. The author has contributed to research in topics: Flame spread & Diffusion flame. The author has an hindex of 4, co-authored 4 publications receiving 49 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, side-edge effects on downward flame spread over two parallel polymethyl methacrylate (PMMA) slabs under different pressure environments were investigated. But the results showed that the flame spread rate is controlled by ignition along the side-Edge, rather than at the center of the samples, for experiments with both single and two parallel slabs.

26 citations

Journal ArticleDOI
TL;DR: Results show that flame spread rate increases exponentially with pressure, and the exponent of pressure further shows an increasing trend with the thickness of the sample, which indicates a steady-burning stage.
Abstract: The present study is aimed at predicting downward flame spread characteristics over poly(methyl methacrylate) (PMMA) with different sample dimensions in different pressure environments. Three-dimensional (3-D) downward flame spread experiments on free PMMA slabs were conducted at five locations with different altitudes, which provide different pressures. Pressure effects on the flame spread rate, profile of pyrolysis front and flame height were analyzed at all altitudes. The flame spread rate in the steady-state stage was calculated based on the balance on the fuel surface and fuel properties. Results show that flame spread rate increases exponentially with pressure, and the exponent of pressure further shows an increasing trend with the thickness of the sample. The angle of the pyrolysis front emerged on sample residue in the width direction, which indicates a steady-burning stage, varies clearly with sample thicknesses and ambient pressures. A global non-dimensional equation was proposed to predict the variation tendency of the angle of the pyrolysis front with pressure and was found to fit well with the measured results. In addition, the dependence of average flame height on mass burning rate, sample dimension and pressure was proposed based on laminar diffusion flame theory. The fitted exponent of experimental data is 1.11, which is close to the theoretical value.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the downward flame spread over poly(methyl methacrylate) sheets with different dimensions was conducted in comparison with the downward flames spread over samples under infinite dimensions.
Abstract: The experiments of downward flame spread over poly(methyl methacrylate) sheets with different dimensions were conducted in this study. In comparison with flame spread over samples under infinite wi...

14 citations

Journal ArticleDOI
01 Oct 2016-Fuel
TL;DR: In this paper, a series of field flash point determinations are performed at six different altitudes on the Qinghai-Tibet Plateau and the results show that flash point decreases nonlinearly with the reduced pressure, which is inconsistent with the current standards of flash point determination, where adopt a linear correction for the pressure effect on flash point.

8 citations


Cited by
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Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: In this article, side-edge effects on downward flame spread over two parallel polymethyl methacrylate (PMMA) slabs under different pressure environments were investigated. But the results showed that the flame spread rate is controlled by ignition along the side-Edge, rather than at the center of the samples, for experiments with both single and two parallel slabs.

26 citations

Journal ArticleDOI
15 Sep 2019-Fuel
TL;DR: In this paper, the authors investigated the burning rates of blending fuels in a full-scale cargo compartment with ambient pressure of 40,kPa, 61, kPa, 80, kpa, 80 kpa and 101 kpa.

22 citations

Journal ArticleDOI
TL;DR: In this article, the effects of the nozzle inclined angle and diameter as well as the heat release rate on the characteristics of syngas jet flame were investigated. And the model can be used to estimate the horizontal extension length of the syngga jet flame for nozzles with different diameters and inclined angles.

22 citations

Journal ArticleDOI
TL;DR: In this paper, flame spread behavior over high-conductivity copper (Cu) core electrical wire in sub-atmospheric pressures, and compares those with relative low-conductive nickel-chrome (NiCr) core Electrical wire, to quantify the evolutions of wire-driven and flame-driven heat transfer mechanisms in supporting flame spread with pressure decreasing.

19 citations