基于FDS的飞机客舱火灾数值模拟计算域优化  

Optimization of Numerical Simulation and ComputationalDomain of Aircraft Cabin Fire Based on FDS

作　　者：伍毅[1,2] 赵羽蝶 陈莹隆 李梦令 WU Yi;ZHAO Yu-die;CHEN Ying-long;LI Meng-ling(Sichuan Key Laboratory of Civil Aircraft FireScience and Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China;College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]中国民用航空飞行学院民机火灾科学与安全工程四川省重点实验室,广汉618307 [2]中国民用航空飞行学院民航安全工程学院,广汉618307

出　　处：《科学技术与工程》2024年第34期14871-14877,共7页Science Technology and Engineering

基　　金：民航教育人才项目(MHJY2022013);民机火灾科学与安全工程四川省重点实验室自主项目(MZ2022JB03);民航安全能力建设项目(MHAQ202275,MHAQ2023030);四川省2021—2023年高等教育人才培养质量和教学改革项目(JG2021-316);中央高校教育教学改革专项(E2022053)。

摘　　要：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 0.9750 and 0.9642,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.

关 键 词：飞机客舱火灾 数值模拟 计算区域 相关性分析 FDS 

分 类 号：V223.2[航空宇航科学与技术—飞行器设计] X913.4[环境科学与工程—安全科学]