飞机客舱烟气扩散数值仿真

Numerical Simulation on Smoke Diffusion in Aircraft Cabin

通过建立五排客舱的几何模型及客舱烟气流动的数值仿真模型,采用RNG k-ε湍流模型对客舱内的湍流流动进行描述。基于Fluent对火灾阴燃阶段客舱内烟气浓度场和温度场进行三维数值模拟分析,预测了烟气浓度随时间变化规律。结合适航规章分析烟气中CO、CO2浓度对客舱空气品质及乘客健康安全的影响,给出火灾紧急措施建议,同时也为大型运输类飞机烟雾的适航审定符合性验证方法的研究提供基础。

Firstly,the cabin′s geometry model with five rows and the smoke diffusion numerical model are established .Turbulent flow in the cabin is described using RNG k -ε two-equations turbulence model . Secondly ,smoke concentration field and the temperature field of 3-D airflow for fire smoldering phase in the cabin are simulated and analyzed based on Fluent .The regularity of smoke concentration changing with time is predicted .At last,comparing with the airworthiness regulation ,the concentration of CO ,CO2 in smoke which influences on the cabin air quality and health safety is analyzed.Recommendations are given for that once fire emergency take place .This work provides foundation for smoke airworthiness com-pliance verification research for large transport aircraft .