一种描述燃油与气体组分传质的频率传质模型
Frequency mass transfer model describeing mass transfer between fuel and air
-
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.Abstract: 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.
-
Key words:
- fuel inerting /
- washing /
- frequency /
- mass transfer model /
- fuel load
-
[1] William M C.The effect of fuel on an inert ullage in a commercial transport airplane fuel tank[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-05/25, 2005. [2] Cavage W M.The cost of implementing ground-based fuel tank inerting in the commercial fleet[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-00/19, 2000. [3] Burns M, Cavage W M.Ground and flight testing of a Boeing 737 center wing fuel tank inerted with nitrogen-enriched air[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-01/63, 2001. [4] Burns M, William M C.Inerting of a vented aircraft fuel tank test article with nitrogen-enriched air[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-01/6, 2001. [5] William M C, Bowman T.Modeling inert gas distribution in commercial transport aircraft fuel tanks[R].St.Louis, Missouri:22nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2002. [6] Summer S M.Limiting oxygen concentration required to inert jet fuel vapors existing at reduced fuel tank pressures:fnal phase[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-04/8, 2004. [7] William M C, Morrison R.Development and testing of the faa simplified fuel tank inerting system[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-05/6, 2005. [8] William M W.The effect of fuel on an inert ullage in a commercial transport airplane fuel tank[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-05/25, 2005. [9] William J.Fuel tank flammability assessment method user's manual[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-05/8, 2002. [10] William M C, Summer S.A study of the flammability of commercial transport airplane wing fuel tanks[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-08/8, 2008. [11] 冯诗愚, 鹿世化, 刘卫华, 等.洗涤效率对飞机燃油箱惰化过程的影响分析[J].航空动力学报, 2010, 25(11):2457-2463. FENG Shiyu, LU Shihua, LIU Weihua, et al.Analysis of inerting process influenced by scrubbing eff iciency in aircraft fuel tank[J].Journal of Aerospace Power, 2010, 25(11):2457-2463.(in Chinese) [12] Burns M, William M C, Hill R.Flight-testing of the faa onboard inert gas generation system on an airbus A320[R].Washington DC, USA:Office of Aviation Research, DOT/FAA/AR-03/58, 2004. [13] 冯晨曦, 刘卫华, 鹿世化, 等.气体分配方式对多隔仓燃油箱地面惰化的影响[J].航空动力学报, 2011, 26(11):2528-2533. FENG Chenxi, LIU Weihua, LU Shihua, et al.Study on ground-based inerting process influenced by different gas distribution for multi-bay fuel tank[J].Journal of Aerospace Power, 2011, 26(11):2528-2533.(in Chinese) [14] 鹿世化, 冯诗愚, 王盛园, 等.考虑氧逸出的多舱燃油箱惰化理论研究[J].南京航空航天大学学报, 2012, 44(1):100-104. LU Shihua, FENG Shiyu, WANG Shengyuan, et al.Theoretical study on inerting process for multi-bay fuel tank based on oxygen evolution[J].Journal of Nanjing University of Aeronautics and Astronautics, 2012, 44(1):100-104.(in Chinese) [15] 刘小芳, 刘卫华, 钱国诚, 等.燃油洗涤引射器充氮性能实验[J].航空动力学报, 2010, 25(4):735-740. LIU Xiaofang, LIU Weihua, QIAN Guocheng, et al.Experiment on nitrogen-filling performance of fuel scrubbing ejector[J].Journal of Aerospace Power, 2010, 25(4):735-740.(in Chinese)
点击查看大图
计量
- 文章访问数: 1277
- HTML浏览量: 2
- PDF量: 935
- 被引次数: 0