Abstract: This paper presents an early fire source location method for cargo hold fire location under low temperature and low pressure during high altitude flight. The method is based on the cross arrangement of sensors, the delay interval of smoke signal detected by sensors is used to calculate the displacement difference of smoke propagation, and the fire source location is traced. It can accurately locate the fire source in the early stage of fire, effectively reduce the amount of fire extinguishing agent, reduce the damage of fire extinguishing agent residue to the atmosphere environment, and promote the construction of green civil aviation. In order to verify the accuracy of the positioning algorithm, A330-300 rear lower cargo compartment model is 1∶1 established in PyroSim fire simulation software, and 20 fire source points are randomly selected. The average relative error of fire source location under low temperature and low pressure is 2.44%. The results show that this positioning method has high positioning accuracy and is suitable for fire source detection in aircraft cargo hold.

Key words: aircraft cargo compartment, early fire, fire source location, low temperature and low pressure, green civil aviation, PyroSim