民用飞机燃油箱可燃性评估方法研究

Research on fuel tank flammability assessment for civil aircraft

民用飞机燃油箱可燃性评估是民机燃油系统适航符合性验证的重要内容。美国联邦航空管理局(FAA)对燃油箱可燃性评估方法进行了深入研究与解读,分析了飞机燃油箱可燃性影响因素,明确了燃油箱可燃性相关参数计算方法,给出基于蒙特卡罗仿真的民用飞机燃油箱可燃性评估流程。该程序以蒙特卡罗仿真为基础,通过随机模拟生成飞行航段中各时间增量的燃油温度,以燃油温度是否在燃油可燃性上、下限之间作为该时间增量内燃油箱可燃的评判标准,求得燃油箱可燃时间,进而求得燃油箱可燃性暴露率。

Fuel tank flammability assessment for civil aircraft is a vital part of civil aircraft fuel system airworthiness certification. A further research on the evaluation method provided by FAA is given. Factors which can affect the fuel tank flammability are analyzed, the parameter calculation method related to the fuel tank flammability is cleared, and the civil aircraft fuel tank flammability assessment process based on Monte Carlo simulation is given. Whether the temperature of fuel in unit time is between the upper and lower flammability limit will decide the fuel tank flammability at that point. The ratio of flammable time account for the total time is a vital reference to the fuel tank flammability assessment.