为了提高飞机客舱火灾数值模拟的精确度，采用火灾动力学三维模拟软件（fire dynamic simulation, FDS）建立全尺寸A320客舱火灾模型，分析了可燃物热解导致的计算域变化对温度特征的影响，通过引入相关性分析方法重点研究了不同计算区域条件下飞机客舱内部热流场变化情况。结果表明，考虑燃烧过程中可燃物的热解变化会增加客舱热释放速率和改变温度场，最大差值可达328 ℃。计算区域延展尺寸大小将影响到飞机客舱内部的热流场计算，当计算区域扩展到2 m时，客舱温度场和火源处温度场的相关性值分别增大至0.975 0和0.964 2，为了在保证数值模拟计算精度的前提下尽量减少计算时间，建议将计算区域向外延展2 m。

In order to improve the accuracy of the numerical simulation of aircraft cabin fire, the full-scale A320 cabin fire model was established by using FDS (fire dynamic simulation), a 3D fire dynamics simulation software, and the influence of the change of the computational domain caused by the pyrolysis of combustible materials on the temperature characteristics was analyzed. The results show that considering the pyrolysis change of combustibles during the combustion process, the cabin heat release rate and the temperature field will be changed, and the maximum difference can reach 328 ℃. When the calculation area is extended to 2 m, the correlation values between the cabin temperature field and the temperature field at the fire source increase to 0.975 0 and 0.964 2, respectively, in order to minimize the calculation time under the premise of ensuring the accuracy of numerical simulation, it is recommended to extend the calculation area outward by 2 m.