摘要
抛开经典Fick定律,提出用传质频率来表征燃油和空气氧氮传质的快慢,建立了以频率传质模型为基础的飞机燃油箱冲洗惰化数学模型,该模型能对传质速度进行量化,而国内外工程界目前使用的模型不具备此量化能力;该数学模型的准确性和有效性得到美国联邦航空管理局(FAA)相关封闭燃油箱内的氧氮传质实验数据的验证;将该数学模型用于仿真A320的飞行阶段的氧的体积分数,仿真结果同测试数据及其他模型的计算结果对比后发现:频率传质模型的计算精度最高;进一步仿真表明,载油率的增加会明显延缓惰化氧的体积分数的降低,且在高载油率下频率传质模型同不传质以及瞬时平衡这两种模型的计算结果差异很大.
In disregard of the classical Fick＇s law, frequency was used to describe the speed of mass transfer between fuel and air. A frequency mass transfer mathematic model of fuel flush inerting was proposed,which employed frequency to describe the mass transfer speed with incomparable advantages than other inerting engineering models. Frequency mass transfer model calculated results were compared with certain experimental data of Federal Aviation Administration （FAA）,and the effectiveness was verified;the calculated results of frequency model and other models were also compared with A320 flight volume fraction of oxygen, showing that the frequency mass transfer model presents highest precision.Further simulation results show that increased fuel load could delay the inerting process,and frequency mass transfer model calculated result is obviously different from the calculated results of non-mass transfer and instant balancing situations when the fuel tank is nearly full.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2013年第12期2709-2716,共8页
Journal of Aerospace Power
关键词
燃油惰化
冲洗
频率
传质模型
载油率
fuel inerting
washing
frequency
mass transfer model
fuel load
