LAPSE:2023.25507
Published Article
LAPSE:2023.25507
Improvement of the Combustion Completeness of Hydrogen Jet Flames within a Mesoscale Tube under Zero Gravity
Junjie Hong, Ming Zhao, Lei Liu, Qiuxiang Shi, Xi Xiao, Aiwu Fan
March 28, 2023
Microjet hydrogen flames can be directly used as micro heat sources or can be applied in micro propulsion systems. In our previous study, under zero gravity and without an active air supply, the combustion completeness of hydrogen jet flames within a mesoscale tube with an inner diameter of 5 mm was very low. In this study, we were dedicated to improving the combustion efficiency by using a convergent nozzle (tilt angle was around 68°) instead of the previous straight one, and the exit diameter was 0.8 or 0.4 mm. The numerical results demonstrate that the maximum combustion efficiency in the case of d= 0.8 mm was only around 15%; however, the peak value for the case of d = 0.4 mm was around 36%. This happened because with d = 0.4 mm, the fuel jet velocity was around four times that of the d = 0.8 mm case. Hence, the negative pressure in the combustor of d = 0.4 mm decreased to a much lower level compared to that of d = 0.8 mm, which led to an enhancement of the air entrainment ratio. However, the highest combustion efficiency of d = 0.4 mm was still below 36%; therefore, a slightly larger tube or an even smaller nozzle exit diameter will be necessary for further improvements to the combustion efficiency.
Keywords
air entrainment ratio, combustion efficiency, flame shape, flame tip opening, micro-jet flame
Suggested Citation
Hong J, Zhao M, Liu L, Shi Q, Xiao X, Fan A. Improvement of the Combustion Completeness of Hydrogen Jet Flames within a Mesoscale Tube under Zero Gravity. (2023). LAPSE:2023.25507
Author Affiliations
Hong J: China Tabacco Hubei Industrial Limited Liability Company, Wuhan 430014, China
Zhao M: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
Liu L: China Tabacco Hubei Industrial Limited Liability Company, Wuhan 430014, China
Shi Q: China Tabacco Hubei Industrial Limited Liability Company, Wuhan 430014, China
Xiao X: China Tabacco Hubei Industrial Limited Liability Company, Wuhan 430014, China
Fan A: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China [ORCID]
Journal Name
Energies
Volume
14
Issue
15
First Page
4552
Year
2021
Publication Date
2021-07-28
Published Version
ISSN
1996-1073
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PII: en14154552, Publication Type: Journal Article
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doi:10.3390/en14154552
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