Abstract: In this paper, cable combustion experiments were conducted in a variable pressure experimental chamber. We measured the burning rate of the cable and the combustion characteristics parameters such as temperature and radiant heat above the cable during the fire spread by changing the ambient pressure and the cable placement angle in the chamber, and processed and analyzed the measured data. The results show that the decrease in pressure affects the heat feedback of the flame. When the inclination is 90°, the burning rates corresponding to different environmental pressures are 0.019 96, 0.020 55, 0.021 26 g/s and 0.023 60 g/s, and the two are positively correlated. When the ambient pressure is 101 kPa, the burning rates corresponding to different inclination angles are 0.009 41, 0.017 28, 0.020 29 g/s and 0.023 60 g/s, and the burning rate accelerates with increasing inclination angle. The relationship between the peak burning rate and the combustion enhancement factor reflects the growth of fire spread.

Key words: cable fire, pressure, inclination, combustion characteristics