Abstract
To better understand the process of fire caused by conducting wire, based on the study of overload of the low-voltage wire, the theoretical analysis of flame spread mechanism of overload-wire was proposed, and the functional relationship between flame shape characteristics and flame spread speed, current, and inclination angle was studied. The results show that: (1) the theoretical model of flame propagation can well reflect the changes of thermodynamic parameters in the process of flame propagation, and it is in better agreement with the experimental results. (2) When the current value is constant, with the increase of the inclination angle of the wire (0°-90°), the flame is elongated along the wire direction, the width of the flame base increases, and the angle between the flame front and the wire decreases. When the inclination angle is fixed, with the increase of the inclination angle of the conductor, the flame shape becomes more "high and wide" and the flame height increases at the same time. (3) When the current is constant, the flame spread rate increases with the increase of wire inclination angle; when the inclination angle is constant, the flame spread rate decreases sharply with the increase of current.
Highlights
Many related studies have shown that the inclination angle has a significant effect on the fire spread characteristics of the solid surface
Drysdale and Macmillan澳 et al [3] conducted upward fire propagation experiments in "hot thin" and "hot thick" PMMA, and found that when the sample placement angle changes from horizontal 0° to 75°, the average flame propagation rate is almost No change; when the inclination angle is changed from 75° to 90°, the flame spread rate increases greatly
Hu Longhua et al [4] studied the influence of the tilt angle on the flame spread rate (FSR) on wires with high thermal conductivity and derived a simplified FSR calculation model
Summary
Many related studies have shown that the inclination angle has a significant effect on the fire spread characteristics of the solid surface. Zhu Keke [5] studied the flame rate of horizontal, upward, and downward spreading of the wire under the inclination angle of -75° to +75°, and conducted an in-depth discussion from the basic flame shape. In actual scenes such as building fires, the wire is placed horizontally, but the inclined state of the wire has a significant impact on its combustion behavior [6,7,8,9]. This article will study the flame spread characteristics of wires passing different currents under different inclination angles
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