• 论文 •

### 昼夜温度变化对燃油箱空余空间氧浓度的影响

1. 南京航空航天大学 航空学院, 南京 210016
• 收稿日期:2019-06-25 发布日期:2020-05-19
• 通讯作者: 刘卫华 E-mail:liuwh@nuaa.edu.cn
• 作者简介:张瑞华 女,博士研究生。主要研究方向:运输类飞机适航技术;刘卫华 男,博士,教授,博士生导师。主要研究方向:飞行器环境控制与生命保障工程。
• 基金资助:
国家自然科学基金（U1933121）；工信部民机专项（工信部联装〔2016〕37号，序号9）；中央高校基本科研业务费专项资金；江苏省科研与实践创新计划（KYCX19_0198）；江苏高校优势学科建设工程

### Influence of diurnal temperature changes on oxygen concentration in free space of fuel tank

ZHANG Ruihua, LIU Weihua, PENG Xiaotian, FENG Shiyu

1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
• Received:2019-06-25 Published:2020-05-19

Abstract: The variation rule determination of oxygen concentration in the free space of fuel tank is the basis of the design of inerting system.However, there are many factors that influence the oxygen concentration in the free space of fuel tank. At present, people still lack the necessary analysis and calculation for the actual phenomenon of the diurnal temperature changes. Taking the central wing fuel tank in a certain airplane as the research object, based on FAR25 airworthiness clauses of diurnal temperature changes, this paper builds theory simulation model. The model is verified by experimental data, and the corresponding relationship between oxygen concentration of free space of fuel tank and temperature difference between day and night is discussed. The influence of the diurnal temperature range, oil load, initial concentration, dissolved oxygen precipitation and other factors on the fuel tank free space oxygen concentration is analyzed, and the initial oxygen concentration limit of fuel tank before shutdown at night that satisfies the requirement of airworthiness clauses is proposed. The study results show that the variation range of day and night temperature, oil load, initial oxygen concentration and other factors have different effects on the oxygen concentration in the free space of fuel tank. The initial oxygen concentration limit of the fuel tank before shutdown should be lower than the minimum oxygen concentration limit of 0.5% - 1%. The research results will be of good reference to the design of inerting system and the calculation of average flammability exposure time of fuel tank.