LIQUID NITROGEN INJECTION INTO AVIATION FUEL TO REDUCE ITS FLAMMABILITY AND POST-IMPACT FIRE EFFECTS

IF 0.8 Q3 ENGINEERING, AEROSPACE Aviation Pub Date : 2023-10-12 DOI:10.3846/aviation.2023.19729
Abdulbaqi Jinadu, Olalekan Adebayo Olayemi, Ayodeji Akangbe, Abdul-Haleem Olatinwo, Volodymyr Koloskov, Dmytro Tiniakov
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Abstract

The finite volume method was used to study the characteristic of contaminated aviation fuel with the aim of reducing its flammability and post-impact fire. The flammability levels between pure Jet A-1 and contaminated Jet A-1 are compared using their flashpoints and fire points before and after the introduction of Liquid Nitrogen. Upon heating different mixing ratios (4:1, 3:1, and 2:1), results are analyzed to identify the best volume ratio exhibiting the highest reduction in flammability. Analysis shows that the mixing ratio of 2:1 not only froze but increased the flashpoint of the mixture from (48 ˚C–50 ˚C) to 64 ˚C. For the mixing ratio of 3:1, there was a rise in flashpoint to about 56 ˚C and partial freezing was seen at the topmost surface. At a mixing ratio of 4:1, it was observed that the effect of liquid nitrogen on Jet A-1 was minimal leading to a slight rise in its flash point (50 ˚C). Thus, liquid Nitrogen had a substantial effect on the flammability and flash point of Jet A-1 when mixed in the ratio (2:1) with a freezing time of 30 seconds and an unfreezing time of 17.5 minutes. Hence, Liquid Nitrogen can be used for the flammability reduction of Jet A-1.
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向航空燃料中注入液氮以降低其可燃性和撞击后的火灾效应
采用有限体积法研究了受污染航空燃油的特性,以降低其可燃性和影响后火灾。通过引入液氮前后的闪点和着火点,比较了纯Jet A-1和污染Jet A-1的可燃性水平。在加热不同的混合比例(4:1,3:1和2:1)后,分析结果以确定表现出最大可燃性降低的最佳体积比。分析表明,2:1的混合比例不仅冻结,而且使混合物的闪点从(48˚C - 50˚C)提高到64˚C。当混合比为3:1时,闪点升高至56℃左右,最表层部分结冰。当混合比为4:1时,液氮对喷气机a -1的影响最小,其闪点(50℃)略有升高。因此,液氮以2:1的比例混合,冻结时间为30秒,解冻时间为17.5分钟,对喷气机a -1的可燃性和闪点有较大影响。因此,液氮可用于降低A-1喷气机的可燃性。
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来源期刊
Aviation
Aviation ENGINEERING, AEROSPACE-
CiteScore
2.40
自引率
10.00%
发文量
20
审稿时长
15 weeks
期刊介绍: CONCERNING THE FOLLOWING FIELDS OF RESEARCH: ▪ Flight Physics ▪ Air Traffic Management ▪ Aerostructures ▪ Airports ▪ Propulsion ▪ Human Factors ▪ Aircraft Avionics, Systems and Equipment ▪ Air Transport Technologies and Development ▪ Flight Mechanics ▪ History of Aviation ▪ Integrated Design and Validation (method and tools) Besides, it publishes: short reports and notes, reviews, reports about conferences and workshops
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