Analytical Algorithm for Oxygen Concentration of Aircraft Fuel Tank in Various Inerting Stages

Ullage washing is an efficient inerting method to keep the ullage oxygen concentration under the safe value, thus reducing the hazard and loss of fire and explosion of aircraft fuel tanks. In the conventional model of ullage washing, the initial derivatives of oxygen concentration that are used to s...

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Bibliographic Details
Published in:Applied sciences 2021-08, Vol.11 (16), p.7698
Main Authors: Wei, Yuhao, Pei, Yang, Ge, Yuxue
Format: Article
Language:English
Subjects:
Aircraft
aircraft fuel tank
Algorithms
analytical algorithm
Aviation
Differential equations
dynamics model
Empirical equations
Error analysis
Experiments
Fuel tanks
Gases
Nitrogen
Ordinary differential equations
oxygen concentration
Storage tanks
Takeoff
Ullage
ullage washing
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Summary:Ullage washing is an efficient inerting method to keep the ullage oxygen concentration under the safe value, thus reducing the hazard and loss of fire and explosion of aircraft fuel tanks. In the conventional model of ullage washing, the initial derivatives of oxygen concentration that are used to solve the differential equations are selected subjectively by researchers and the empirical select influences the accuracy of the result. Therefore, this paper proposes an analytical algorithm that can calculate the ullage oxygen concentration without selecting any initial derivative value. The algorithm is based on a fuel tank ullage washing model regarding various inerting stages. It has been experimentally validated with an average relative error of 5.781%. Moreover, sensitive analyses carried out on the proposed model show that ground-based inerting can effectively reduce the ullage oxygen, concentration in the climb phase. Increasing 5 min of pre-takeoff inerting duration can shorten the time of decreasing the ullage oxygen concentration to 9% after takeoff by 2.1 min.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11167698