北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (4): 765-771.doi: 10.13700/j.bh.1001-5965.2017.0265

• 论文 • 上一篇    下一篇

RP-3航空燃油中CO2扩散系数实验分析

李超越1, 冯诗愚1, 邵垒1, 潘俊2, 刘卫华1   

  1. 1. 南京航空航天大学航空宇航学院飞行器环境控制与生命保障工业和信息化部重点实验室, 南京 210016;
    2. 中航工业南京机电液压工程研究中心航空机电系统综合航空科技重点实验室, 南京 211106
  • 收稿日期:2017-04-27 出版日期:2018-04-20 发布日期:2018-04-27
  • 通讯作者: 冯诗愚 E-mail:shiyuf@nuaa.edu.cn
  • 作者简介:李超越,男,博士研究生。主要研究方向:飞机燃油箱惰性化技术;冯诗愚,男,博士,副教授。主要研究方向:油箱惰性化和飞机燃油系统。
  • 基金资助:
    航空科学基金(20132852040);江苏省研究生科研与实践创新计划项目(KYCX17_0279);中航工业技术创新基金(2014D60931R);民用飞机专项科研经费([2016]37);中央高校基本科研业务费专项资金;江苏高校优势学科建设工程基金

Experimental analysis of carbon dioxide diffusion coefficient in RP-3 jet fuel

LI Chaoyue1, FENG Shiyu1, SHAO Lei1, PAN Jun2, LIU Weihua1   

  1. 1. Key Laboratory of Aircraft Environment Control and Life Support of MIIT, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, AVIC Nanjing Engineering Institute of Aircraft Systems, Nanjing 211106, China
  • Received:2017-04-27 Online:2018-04-20 Published:2018-04-27
  • Supported by:
    Aeronautical Science Foundation of China (20132852040); Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0279); Technology Innovation Foundation of AVIC (2014D60931R); Special Research Foundation of Civil Aircraft ([2016]37); the Fundamental Research Funds for the Central Universities; Priority Academic Program De-velopment of Jiangsu Higher Education Institutions

摘要: CO2在航空燃油中的质量扩散规律对飞机油箱惰化系统的研究极其重要。搭建压力降法实验装置测量CO2在RP-3航空燃油中的扩散系数,实验测试了-20、0、20、40和60℃恒温条件下的CO2气相空间压力随时间变化关系。根据Fick定律建立了容器中二维扩散方程,并采用数值解法,设定扩散系数值,求解气体在航空燃油中的浓度分布,根据质量守恒和实际气体状态方程可得到CO2气相空间压力,并与实验记录的气体压力进行比较。以扩散系数为自变量,推导了实验与理论计算误差函数,并采用Husain单一变量搜索法,使误差函数值最小,可得到扩散系数最优解。研究还显示CO2在RP-3航空燃油中的扩散系数随温度升高而增大,满足Arrhenius方程。

关键词: CO2, RP-3航空燃油, 压力降法, 传质, 扩散系数, 优化

Abstract: The rule of mass diffusion of CO2 in jet fuel is an important consideration in the research of the aircraft fuel tank inerting system. A pressure-decay test apparatus was constructed to measure the diffusion coefficient of carbon dioxide in RP-3 jet fuel by monitoring the pressure variation at constant temperature of -20, 0, 20, 40, and 60℃, respectively. The two-dimensional diffusion equation in the hermetic container was derived based on Fick's law, and the concentration distribution was determined via the numerical method with the assumption that diffusion coefficient was known. Then pressure on ullage was predicted by utilizing mass conservation and real gas state equation and the calculating result was compared with the experimental data. By adopting the diffusion coefficient as the independent variable, the error functions as the experimental and theoretical data were derived. The optimum solution to the diffusion coefficient was obtained by Husain single variable search method to minimize the error. The study also reveals that the diffusion coefficient increases with the rise of the temperature, and the Arrhenius equation could be employed to correlate the diffusion coefficient and temperature.

Key words: carbon dioxide, RP-3 jet fuel, pressure-decay method, mass transfer, diffusion coefficient, optimization

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