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• W3211383140 endingPage "111842" @default.
• W3211383140 startingPage "111842" @default.
• W3211383140 abstract "Simultaneous, dual-perspective, high-speed imaging is used to provide new insight into the morphology of flames generated at high unburned-gas temperatures behind reflected shock waves. Single-perspective, end-wall imaging left previous applications of the shock-tube flame speed method reliant on an assumption of axial symmetry when interpreting experimental results. Here, we report qualitative and quantitative observations from the first application of simultaneous side- and end-wall emission imaging to characterize the three-dimensional morphology of these flames. Side-wall imaging reveals that, while the expected flame symmetry is observed under static and relatively low temperature post-reflected-shock conditions, symmetry can break down at higher temperatures. These results reveal that the concentric regions of emission previously observed in flame experiments in the negative-temperature-coefficient ignition regime can be explained as the axial integration of emission through a distorted flame. Several physical mechanisms are evaluated towards the goal of identifying the underlying cause of flame distortion. The post-reflected-shock flow field and pressure-wave–flame interactions are both found insufficient to explain the results. Presently, not enough is known about the recently identified local-double-flame structure to assess the likelihood of its relevance in the present experiments. As such, while the dual-perspective imaging results provide important new insight into the morphology of high-temperature flames and inform the correct interpretation of previous experimental observations, the specific mechanism leading to the observed distortion remains a topic requiring further attention." @default.
• W3211383140 created "2021-11-22" @default.
• W3211383140 creator A5018878492 @default.
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• W3211383140 date "2022-03-01" @default.
• W3211383140 modified "2023-10-18" @default.
• W3211383140 title "Distortion of expanding n-heptane flames at high unburned-gas temperatures behind reflected shocks" @default.
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• W3211383140 doi "https://doi.org/10.1016/j.combustflame.2021.111842" @default.
• W3211383140 hasPublicationYear "2022" @default.
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