期刊
AERONAUTICAL JOURNAL
卷 125, 期 1291, 页码 1469-1483出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/aer.2021.34
关键词
fuel; air mixing; mixer; combustion; criterion; emission
A practical method for quantitatively evaluating the uniformity of fuel/air mixing is essential for research and development of advanced low-emission combustion systems. The new approach based on the fuel/air equivalence ratio distribution helps estimate maximum temperature variation and mixing quality, with additional statistical supplementary criteria needed in important situations.
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.
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