Study on Prefire Phenomena of Wire Insulation at Microgravity |
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Authors: | Wenjun Kong Baorui Wang Weikuo Zhang Yuhua Ai Shiqi Lao |
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Affiliation: | (1) Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing, 100080, China |
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Abstract: | The experimental hardware was developed to perform the experiments of prefire characteristics of wire insulation caused by
overload on board the SJ-8 China recoverable satellite. In the experiments, the prefire characteristics including the temperature
and radiation characteristics of the wire insulations were presented. The temperature histories of the wire insulation in
microgravity and the low-pressure environment in normal gravity were obtained. Effects of overloaded currents on the fire
initiation were investigated for different wire coiled states. The results indicate that the natural convection almost vanished
and the heat loss of the electric components decreased in the microgravity environment. It might cause overheating of the
electric components and then results in fire, and thus the fire risks of wire in the microgravity condition are much more
dangerous than that in normal gravity under the condition of overload. |
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Keywords: | Fire safety Microgravity Wire insulation overload |
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