It is crucial to guide airplane passengers in effectively choosing reasonable evacuation exits, according to the consequences of evacuation in post-crash accidents. This paper presents a performance simulation method to analyze the safety of the evacuation procedures. The temperature and the concentration of carbon monoxide are pointed out as the main threats during the evacuation. Thus, the modified formulas of these two hazard factors are defined as the safety lines to measure the overrun of each indicator. The Fire Dynamics Simulator and Pathfinder are used to measure the available safe egress time and the required safe egress time, respectively, for each exit in an A380 aircraft. The available exits are determined to ensure the safety of passengers, based on the time interval between the available safe egress time and the required safe egress time. According to the simulation, the flashover cannot happen within 90 s, and many passengers who choose exits 3 and 5 are in danger during the evacuation. The utilization rates of the three exits in the upper cabin are very low. This paper proposes an optimized evacuation plan to ensure the safety of passengers.Nomenclature C = concentration of carbon monoxide, ppm C CO = real-time concentration of the carbon monoxide, ppm C CO = average concentration of carbon monoxide, ppm dt = time step T = air temperature,°C T E = real-time temperature,°C T E = average temperature,°C t = time limit of endurance, s V = poison load Y = probability variable

The fire simulation curve this paper presents is based on a curve which is proposed by Barnett in 2002. The curve is used to study the temperature change in a fire scenario in the interior of a rectangular compartment. However, it is not applicable to use in some long, limited spaces with arc boundaries, such as aircraft cabins. Some improvements and simplifications are made to the curve to solve this problem. A numerical simulation is conducted via the modified curve in a B737 fuselage during a postcrash fire. The result is compared with a fire dynamics simulator (FDS) simulation and a full-scale test undertaken by the National Aeronautics and Space Administration (NASA). The practicability and accuracy of the modified curve is proved through the relevant analysis and the main relative error analysis. The time to flashover is also predicted by the curve and the FDS simulation, respectively. Several parameters are chosen as influence factors to study their effect on the time to flashover in order to delay the occurrence of the flashover. This study may provide a technical support for the cabin fire safety design, safety management, and fire safety engineering.