Impact of heat release on strain rate field in turbulent premixed Bunsen flames

Coriton, Bruno Rene Leon; Frank, Jonathan H.

doi:10.1016/j.proci.2016.07.006

Impact of heat release on strain rate field in turbulent premixed Bunsen flames

Journal Article · Wed Aug 10 00:00:00 EDT 2016 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2016.07.006· OSTI ID:1329630

^[1]; Frank, Jonathan H. ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)

The effects of combustion on the strain rate field are investigated in turbulent premixed CH₄/air Bunsen flames using simultaneous tomographic PIV and OH LIF measurements. Tomographic PIV provides three-dimensional velocity measurements, from which the complete strain rate tensor is determined. The OH LIF measurements are used to determine the position of the flame surface and the flame-normal orientation within the imaging plane. This combination of diagnostic techniques enables quantification of divergence as well as flame-normal and tangential strain rates, which are otherwise biased using only planar measurements. Measurements are compared in three lean-to-stoichiometric flames that have different amounts of heat release and Damköhler numbers greater than unity. The effects of heat release on the principal strain rates and their alignment relative to the local flame normal are analyzed. The extensive strain rate preferentially aligns with the flame normal in the reaction zone, which has been indicated by previous studies. The strength of this alignment increases with increasing heat release and, as a result, the flame-normal strain rate becomes highly extensive. These effects are associated with the gas expansion normal to the flame surface, which is largest for the stoichiometric flame. In the preheat zone, the compressive strain rate has a tendency to align with the flame normal. Away from the flame front, the flame – strain rate alignment is arbitrary in both the reactants and products. The flame-tangential strain rate is on average positive across the flame front, and therefore the turbulent strain rate field contributes to the enhancement of scalar gradients as in passive scalar turbulence. As a result, increases in heat release result in larger positive values of the divergence as well as flame-normal and tangential strain rates, the tangential strain rate has a weaker dependence on heat release than the flame-normal strain rate and the divergence.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1329630

Alternate ID(s):: OSTI ID: 1413161

Report Number(s):: SAND--2016-10308J; 648269

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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