Numerical Modeling of Flame Shedding and Extinction behind a Falling Thermoplastic Drip

Xiong, Caiyi; Huang, Xinyan

doi:10.1007/s10494-021-00250-5

Cited by 6 publications

(4 citation statements)

References 33 publications

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“…At higher Reynolds numbers, the induced von Kármán vortex shedding interacts with the wake flame leading to flame shedding or stretching. Similar observations were shown by Huang (2018) and Xiong & Huang (2021), where a far-wake-stabilized droplet flame exhibited shedding and extinction due to the onset of BVK instability (see figure 1 b ).…”

Section: Introductionsupporting

confidence: 86%

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Insights into the flame transitions and flame stabilization mechanisms in a freely falling burning droplet encountering a co-flow

Vadlamudi,

Aravind,

Basu

2023

J. Fluid Mech.

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The present study investigates the flame dynamics of a contactless burning fuel droplet under free fall subjected to a co-flow. The dynamic external relative flow established due to co-flow and droplet acceleration results in a series of droplet flame transitions. Different flame structures were observed, including a wake flame, reversed wake flame and enveloped flame. Following ignition, the droplet is allowed to fall through the central tube of a co-flow arrangement, and, at its exit, the droplet flame encounters the co-flow. The wake flame, which was established based on the droplet's instantaneous velocity of descent, encounters the abrupt relative velocity jump due to the co-flow. This causes the droplet flame to go through various transitions as it approaches equilibrium with the surrounding flow. Once it equilibrates, the droplet flame evolves in response to the instantaneous relative flow velocity. The droplet flame evolves by altering both its shape and the stabilization mechanism. Two stabilization mechanisms were identified for the droplet wake flame: edge-flame stabilization and bluff-body stabilization. The stabilization mechanism for different flame structures and the transition events have been theoretically analysed, and the relation between flame shape evolution and flow velocity has been determined based on the flow-field characteristics at the corresponding Re (Reynolds number) range. Furthermore, these correlations are employed in a mathematical formulation based on the spring–mass analogy, which predicts the droplet flame evolution after encountering the co-flow, including all the transition events.

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Section: Introductionsupporting

confidence: 86%

“…Researchers like Huang (2018) and Xiong & Huang (2021) investigated freely falling combusting molten polyethylene droplets. The droplet flame is observed to stabilize in the far wake, which exhibited shedding due to the generated von Kármán street (BVK).…”

Section: Introductionmentioning

confidence: 99%

Insights into the flame transitions and flame stabilization mechanisms in a freely falling burning droplet encountering a co-flow

Vadlamudi,

Aravind,

Basu

2023

J. Fluid Mech.

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show abstract

“…Based on our previous work [15], the most prominent difference between the dripping flames at the early and later stages is that the developed dripping flame has a structure similar to the classical von Kármán vortex street, i.e., the flaming shedding. In other words, in the coordinate referenced to a later-stage and fast-falling drip, the pyrolysis gas seems to be injected out from the top sphere, which leads to a rise of momentum for the fuel stream behind the drip [23]. This is evidenced by that the developed dripping case behaves similar to a lifted jet flame, see in Fig.…”

Section: Extinguishing the Fast-moving Dripping Flamingmentioning

confidence: 98%

Extinguishing the dripping flame by acoustic wave

Xiong

Liu

et al. 2021

Fire Safety Journal

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“…For example, about four drips can successfully ignite the 0.10-mm thin paper, no matter the drip is 2.6 mg or 4.6 mg. Noted that as the size of a drip decreases below 2.3 mg, these small dips can no longer carry with a flame after falling for 50 cm [3,41], so that the risk of dripping ignition becomes small.…”

Section: Dripping Ignition Of Papersmentioning

confidence: 99%