Affiliation of Author(s):航空学院
Journal:Beijing Hangkong Hangtian Daxue Xuebao
Abstract:The rule of mass diffusion of CO2in 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. © 2018, Editorial Board of JBUAA. All right reserved.
ISSN No.:1001-5965
Translation or Not:no
Date of Publication:2018-04-01
Co-author:Li, Chaoyue,Shao, Lei,Pan, Jun,lwh
Correspondence Author:Li, Chaoyue,TealC