An alternative approach to evaluate fuel/air mixing quality

A practical method to evaluate quantitatively the uniformity of fuel/air mixing is essential for research and development of advanced low-emission combustion systems. Typically, this is characterised by measuring an unmixedness parameter or a uniformity index. An alternative approach, based on the f...

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Bibliographic Details
Published in:Aeronautical journal 2021-09, Vol.125 (1291), p.1469-1483
Main Author: Jiang, L.-Y.
Format: Article
Language:English
Subjects:
Combustion temperature
Criteria
Equivalence ratio
Evaluation
Fuel-air mixing
Fuels
Nonuniformity
R&D
Research & development
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Summary:A practical method to evaluate quantitatively the uniformity of fuel/air mixing is essential for research and development of advanced low-emission combustion systems. Typically, this is characterised by measuring an unmixedness parameter or a uniformity index. An alternative approach, based on the fuel/air equivalence ratio distribution, is proposed and demonstrated in a simple methane/air venturi mixer. This approach has two main advantages: it is correlated with the fuel/air mixture combustion temperature, and the maximum temperature variation caused by fuel/air non-uniformity can be estimated. Because of these, it can be used as a criterion to check fuel/air mixing quality, or as a target for fuel/air mixer design with acceptable maximum temperature variation. For the situations where the fuel/air distribution non-uniqueness issue becomes important for fuel/air mixing check or mixer design, an additional statistical supplementary criterion should also be used.
ISSN:0001-9240
2059-6464
DOI:10.1017/aer.2021.34