Two-stage autoignition and edge flames in a high pressure turbulent jet

Krisman, Alex; Hawkes, Evatt R.; Chen, Jacqueline H.

doi:10.1017/jfm.2017.282

Two-stage autoignition and edge flames in a high pressure turbulent jet

Journal Article · Tue Jul 04 00:00:00 EDT 2017 · Journal of Fluid Mechanics

DOI:https://doi.org/10.1017/jfm.2017.282· OSTI ID:1372357

^[1]; Hawkes, Evatt R. ^[2]; Chen, Jacqueline H. ^[3]

Univ. of New South Wales, Kensington, NSW (Australia); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of New South Wales, Kensington, NSW (Australia)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

A three-dimensional direct numerical simulation is conducted for a temporally evolving planar jet of n-heptane at a pressure of 40 atmospheres and in a coflow of air at 1100 K. At these conditions, n-heptane exhibits a two-stage ignition due to low- and high-temperature chemistry, which is reproduced by the global chemical model used in this study. The results show that ignition occurs in several overlapping stages and multiple modes of combustion are present. Low-temperature chemistry precedes the formation of multiple spatially localised high-temperature chemistry autoignition events, referred to as ‘kernels’. These kernels form within the shear layer and core of the jet at compositions with short homogeneous ignition delay times and in locations experiencing low scalar dissipation rates. An analysis of the kernel histories shows that the ignition delay time is correlated with the mixing rate history and that the ignition kernels tend to form in vortically dominated regions of the domain, as corroborated by an analysis of the topology of the velocity gradient tensor. Once ignited, the kernels grow rapidly and establish edge flames where they envelop the stoichiometric isosurface. A combination of kernel formation (autoignition) and the growth of existing burning surface (via edge-flame propagation) contributes to the overall ignition process. In conclusion, an analysis of propagation speeds evaluated on the burning surface suggests that although the edge-flame speed is promoted by the autoignitive conditions due to an increase in the local laminar flame speed, edge-flame propagation of existing burning surfaces (triggered initially by isolated autoignition kernels) is the dominant ignition mode in the present configuration.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1372357

Report Number(s):: SAND--2017-4187J; PII: S0022112017002828

Journal Information:: Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 824; ISSN applab; ISSN 0022-1120

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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