NDLI: Effects of Overall Equivalence Ratio on Flame Structure of Rich-Premixed n-Decane Spray Jet

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Effects of Overall Equivalence Ratio on Flame Structure of Rich-Premixed n-Decane Spray Jet

Content Provider	Semantic Scholar
Author	Mikami, Masato Keita Kojima, Naoya
Copyright Year	2008
Abstract	The flame structure of rich-premixed-spray jets in quiescent atmosphere was experimentally studied for different overall equivalence ratios of the fuel spray/air mixture. N-decane was used as a low-volatility fuel to elucidate the local heterogeneity effect. The overall equivalence ratio of the premixed-spray jet was varied with the fuel flow rate while the air flow rate in the premixed-spray jet was kept constant. As the overall equivalence ratio was decreased from a quite large value, the combustion mode transited from the combustion with the external flame alone to that with the external flame and the internal flame. Further decrease caused disintegration of the internal flame. In this case, the internal flame oscillated largely and a part of the internal flame was sometimes disintegrated into bubble-like internal flames, which disappeared inside the external flame. The oscillation and disintegration of the internal flame was possibly caused by non-uniformity in local flame-spread rate due to non-uniform droplet spatial distribution. Characteristics of the internal flame, including transition from combustion with the internal flame to that without the internal flame, were discussed based on the analogy to the spreading flame in the premixed spray.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.combustionsociety.jp/fullpaper/153pdf/153_2.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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