TY - JOUR
T1 - Transient interactions between a premixed double flame and a vortex
AU - Reuter, Christopher B.
AU - Katta, Viswanath R.
AU - Yehia, Omar R.
AU - Ju, Yiguang
N1 - Funding Information:
The authors recognize the support of NSF grant CBET-1507358 , NASA ISS Post-Graduate award NNX15AB67G , and NASA microgravity grant NNX16AK07G . CBR is supported by the NDSEG fellowship program of the U.S. Department of Defense. ORY is grateful for support from the Daniel and Florence Guggenheim Foundation Fellowship at Princeton University.
Publisher Copyright:
© 2018 Elsevier Ltd.
PY - 2019
Y1 - 2019
N2 - The interaction between a laminar flame and a vortex is an important study for understanding the fundamentals of turbulent combustion. In the past, however, flame-vortex interactions have been investigated only for high-temperature flames. In this study, the impact of a vortex on a premixed double flame, which consists of a coupled cool flame and a hot flame, is examined experimentally and computationally using dimethyl ether/oxygen/ozone mixtures. The double flame is first shown to occur near the extinction limit of the hot flame. The differences between steady-state cool flames, double flames, and hot flames are explored in a one-dimensional counterflow configuration. The transient interactions between double flames and impinging vortices are then investigated experimentally using a micro-jet and numerically in two-dimensional transient modeling. It is seen that the vortex can extinguish the near-limit hot flame locally, resulting in a lone cool flame. At higher vortex intensities, the cool flame may also be extinguished after the extinction of the hot flame. It is found that there can be three different transient flame structures coexisting at the same time: an extinguished flame hole, a cool flame, and a double flame. Moreover, flame curvature is shown to play an important role in determining whether the vortex weakens or strengthens the cool flame and double flame.
AB - The interaction between a laminar flame and a vortex is an important study for understanding the fundamentals of turbulent combustion. In the past, however, flame-vortex interactions have been investigated only for high-temperature flames. In this study, the impact of a vortex on a premixed double flame, which consists of a coupled cool flame and a hot flame, is examined experimentally and computationally using dimethyl ether/oxygen/ozone mixtures. The double flame is first shown to occur near the extinction limit of the hot flame. The differences between steady-state cool flames, double flames, and hot flames are explored in a one-dimensional counterflow configuration. The transient interactions between double flames and impinging vortices are then investigated experimentally using a micro-jet and numerically in two-dimensional transient modeling. It is seen that the vortex can extinguish the near-limit hot flame locally, resulting in a lone cool flame. At higher vortex intensities, the cool flame may also be extinguished after the extinction of the hot flame. It is found that there can be three different transient flame structures coexisting at the same time: an extinguished flame hole, a cool flame, and a double flame. Moreover, flame curvature is shown to play an important role in determining whether the vortex weakens or strengthens the cool flame and double flame.
KW - Counterflow premixed flame
KW - Dimethyl ether
KW - Double flame
KW - Flame-vortex interaction
KW - Low-temperature chemistry
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U2 - 10.1016/j.proci.2018.07.050
DO - 10.1016/j.proci.2018.07.050
M3 - Article
AN - SCOPUS:85050492645
SN - 1540-7489
VL - 37
SP - 1851
EP - 1859
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 2
ER -