【作者】 薛勇；

【导师】 刘卫华；

【作者基本信息】 南京航空航天大学 ， 制冷及低温工程， 2010， 硕士

【摘要】 民机一般采用惰性气冲洗方法对飞机燃油箱进行惰化保护,该方法利用空气分离模块(ASM—Air Separation Module)产生富氮气体(NEA—Nitrogen Enriched Air),并将富氮气体通入燃油箱上部空间,用以稀释油箱上部气相空间原有的及由于飞机爬升或晃动而从燃油溢出到气相空间的氧气。针对民机油箱惰化技术的研究任务要求,论文通过搭建一个实验平台,对空气分离模块在不同条件下的工作性能进行实验;并通过整理实验数据获得膜工作温度、ASM进气压力和飞行高度对ASM工作性能的影响;基于已有的实验数据,利用人工神经网络方法模拟和预测了其它ASM模块的工作性能,获得各参数单独变化对ASM工作性能的影响。文章还建立了燃油气液界面的频率传质模型,并将此模型计算结果和FAA所公布的实验结果进行对比,验证了其有效性;在此基础上,利用该频率传质模型,分析了载油率对燃油箱上部空间氧浓度变化的影响规律;同时,也就飞机在地面滑行阶段,不同氧浓度NEA惰化效果进行了模拟,研究结果表明:7%氧浓度NEA是滑行-起飞阶段对飞机燃油箱进行冲洗的最优浓度。更多还原

【Abstract】 The technology of flush inerting is generally used to protect fuel tank of civil aircrafts. First, Nitrogen Enriched Air (NEA) is generated by using air separation module (ASM-Air Separation Module); then Nitrogen Enriched Air air is passed into the upper space of the fuel tank, which dilutes the original oxygen in fuel tank of the upper gas space and the extra oxygen spilled from the oil due to the climbing or rocking of the aircraft.For requirements of civil aircraft fuel tank inerting technology, an experimental platform for the air separation module performance is built, and experiments under various operating conditions of ASM are carried out. It is revealed that the performance of ASM is mainly influenced by the operating temperature, inlet pressure or the altitude; based on the available experimental data, the Neural Network method is induced to independently simulate and predict the performance of ASM. In this thesis, a new mathematical model named Frequency-Mass Transfer Model is proposed to describe the mass transfer through the gas-liquid phase interface, and the calculating results are are compared with the experimental data of FAA, and its effectiveness is verified; by using the Frequency-Mass Transfer Model, mass transfer of oxygen and nitrogen in the fuel tank during climb and cruise is calculated, and the calculating results are compared with experimental data of A320. Fuel loading effects on the changes of oxygen concentration in the upper space of the fuel tank is also studied. The inerting effect is calculated under different concentration of NEA, which shows that 93% NEA is the optimal choice when the aircraft taxis on the ground.更多还原