RP-3航空燃油中CO<sub>2</sub>扩散系数实验分析

李超越; 冯诗愚; 邵垒; 潘俊; 刘卫华

doi:10.13700/j.bh.1001-5965.2017.0265

RP-3航空燃油中CO₂扩散系数实验分析

doi: 10.13700/j.bh.1001-5965.2017.0265

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

基金项目:

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 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

详细信息

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

通讯作者:
冯诗愚, E-mail: shiyuf@nuaa.edu.cn

中图分类号: V312;TQ021.4
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出版历程
- 收稿日期: 2017-04-27
- 录用日期: 2017-08-31
- 网络出版日期: 2018-04-20

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

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

Funds:

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 Development of Jiangsu Higher Education Institutions

More Information

Corresponding author: FENG Shiyu, E-mail: shiyuf@nuaa.edu.cn

摘要

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。
- 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.
- carbon dioxide /
- RP-3 jet fuel /
- pressure-decay method /
- mass transfer /
- diffusion coefficient /
- optimization

HTML全文

图 1 压力降法实验装置图

Figure 1. Schematic diagram of pressure-decay experiment apparatus

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图 2 扩散模型示意图

Figure 2. Schematic diagram of diffusion model

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图 3 CO₂-RP-3燃油体系不同温度下压力平均误差随扩散系数变化关系

Figure 3. Variation of average pressure differencewith diffusion coefficient under different temperature for CO₂-RP-3 jet fuel system

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图 4 计算压力降与实验数据比较

Figure 4. Comparison of calculated pressure decay with experimental data

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图 5 扩散系数随温度变化关系

Figure 5. Relationship between diffusion coefficient and temperature

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图 6 实验测量不同时刻压力变化

Figure 6. Experimental measurement of variation of pressure versus time

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表 1 扩散系数最优解

Table 1. Optimum solution of diffusion coefficient

T/℃	Δp_{ave, min}/kPa	D/(10^-8m²·s^-1)
-20	5.89	6.1
0	3.87	7.6
20	5.35	8.6
40	4.98	9.7
60	3.59	11.1

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