1 College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Guanghan 618307, Sichuan, China 2 Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province, Civil Aviation Flight University of China, Guanghan 618307, Sichuan, China 3 Technology Engineering Research Center for All-electric Navigable Aircraft, Guanghan 618307, Sichuan, China
Abstract: The interior wall panel materials currently used in civil aircraft are categorized into two types: glass fiber/phenolic resin laminated boards and sandwich panels. These materials serve to insulate and delay the spread of flames in case of a fire. The civil aviation management department places greater emphasis on the burn-through resistance of wall panels. However, the high-temperature surface of these panels under the influence of a fire source possesses a certain ignition capability prior to burn-through, posing a significant fire hazard. This work investigates the thermal insulation performance and backside temperature rise of these two types of wall panels. Additionally, it explores the ignition times and heat flux of common combustibles (pine wood, cotton, and corrugated cardboard) in aviation transportation environments under fire conditions. A model was established to simulate the distribution of external heat flux for these panels, aiming to determine their ignition boundary conditions. The findings revealed that the maximum temperature rise rates on the backside of laminated boards and sandwich panels were 3.7 ℃/s and 0.48 ℃/s, respectively, indicating that the insulation performance of the sandwich panel surpasses that of the laminated board. The established external heat flux model demonstrates that as the spacing increases, the convective heat transfer between the two types of panels gradually diminishes. The laminated board transitions to thermal radiation ignition, whereas the thermal convection of the sandwich panel still dominates the heat transfer process. When the power of the high-temperature heat source on the near-fire side remains constant, the critical distances for igniting the three combustibles on the laminated board are 1.0 cm, 3.0 cm, and 6.0 cm, respectively. The sandwich panel is incapable of igniting pine wood, while the critical distances for igniting cotton and corrugated cardboard are both 1.0 cm. Notably, the ignition time of sandwich panels is significantly longer than that of laminated panels. Specifically, the ignition time of sandwich panels is significantly longer than that of laminated panels, increasing to 202 s and 190 s, respectively, when the spacing is 1.0 cm.
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2025, Vol. 39 
