Insight into flickering/shedding in buoyant droplet-diffusion flame during interaction with vortex

Thirumalaikumaran S.K.; Vadlamudi G.; Basu S.

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Insight into flickering/shedding in buoyant droplet-diffusion flame during interaction with vortex

机译：Insight into flickering/shedding in buoyant droplet-diffusion flame during interaction with vortex

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? 2022 The Combustion InstituteThe interaction of incident vortex with buoyant diffusion flame of a pendant fuel droplet (n-dodecane) is investigated in the present study. The flame stretching/shedding events occur depending on vortex strengths, which are characterized using vortex Reynolds number (Rev). Different flame response regimes have been identified for different vortex strengths. The velocity scale associated with the vortices is higher when compared to natural convection velocity leading to forward extinction, followed by flame lift-off. The flame lift-off increases with Rev, and partial extinction occurs at very high Rev. In all the cases, the flame oscillates/sheds during the vortex interaction, which causes a momentary increase in the flame heat release rate. As the vortex moves past the flame, the oscillations dampen gradually, and the flame regains the natural buoyant behavior. The high-velocity scales imposed during vortex interaction make the flow momentum-dominant, resulting in a low Richardson number (Ri). Since, the flickering frequency scaling valid for Ri>>1 is not obeyed, a new scaling has been proposed to incorporate the vortex momentum effect by using vortex circulation instead of gravity. Only a portion of the incident vortex circulation contributes to the shedding as some of it is lost to forward extinction and lift-off events. Thus, the reduced vortex velocity scale is used to estimate the critical circulation. The flame shedding height calculated using new scaling in the critical circulation equation agrees with experimental observations.

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来源
《Combustion and Flame》 |2022年第6期|1.1-1.11|共11页
作者
Thirumalaikumaran S.K.; Vadlamudi G.; Basu S.;
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作者单位

Department of Mechanical Engineering Indian Institute of Science;

Department of Mechanical Engineering Indian Institute of ScienceDepartment of Mechanical Engineering Indian Institute of Science||Interdisciplinary Centre for Energy Research (ICER) Indian Institute of Science||;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类
关键词
Buoyant diffusion flame; Circulation; Droplet combustion; Vortex-flame interactions; Vorticity;

Insight into flickering/shedding in buoyant droplet-diffusion flame during interaction with vortex

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