Study of an opposed jet turbulent flame using the sub-grid PDF method
File(s)
Accepted version
Author(s)
Gong, Yu
Jones, William
Marquis, Andrew
Type
Conference Paper
Abstract
Turbulent premixed flames generated by a counter-flow burner are studied numerically using Large Eddy
Simulation (LES). A transported probability density function (pdf ) approach is adopted to simulate sub-grid
scale (sgs) turbulence-chemistry interaction. A solution to the joint sgs-pdf evolution equation of the scalars
is obtained by the Eulerian stochastic field method. The chemistry is represented by means of a simplified
chemical reaction mechanism containing 15 reaction steps and 19 species, and the subgrid scale stresses
and scalar fluxes are modelled by a dynamic Smagorinsky model and a gradient type model respectively.
This work investigates the the effect of the interaction of turbulent flames and combustion product on the
premixed counter-flow flame in terms of the probability of localised extinction. The simulations show good
agreement with the experimental measurements in terms of velocity fields in both absolute and relative
frames, and the local progress variable which reflects the probability of finding the fresh combustion product
are reasonably reproduced using 8 stochastic fields. Overall, the results serve to demonstrate the capability
of the LES-pdf method in the study of the premixed opposed jet turbulent flame.
Simulation (LES). A transported probability density function (pdf ) approach is adopted to simulate sub-grid
scale (sgs) turbulence-chemistry interaction. A solution to the joint sgs-pdf evolution equation of the scalars
is obtained by the Eulerian stochastic field method. The chemistry is represented by means of a simplified
chemical reaction mechanism containing 15 reaction steps and 19 species, and the subgrid scale stresses
and scalar fluxes are modelled by a dynamic Smagorinsky model and a gradient type model respectively.
This work investigates the the effect of the interaction of turbulent flames and combustion product on the
premixed counter-flow flame in terms of the probability of localised extinction. The simulations show good
agreement with the experimental measurements in terms of velocity fields in both absolute and relative
frames, and the local progress variable which reflects the probability of finding the fresh combustion product
are reasonably reproduced using 8 stochastic fields. Overall, the results serve to demonstrate the capability
of the LES-pdf method in the study of the premixed opposed jet turbulent flame.
Date Acceptance
2019-01-24
Copyright Statement
© 2019 The Author(s)
Source
9th European Combustion Meeting
Start Date
2019-04-14
Finish Date
2019-04-17
Coverage Spatial
Lisbon, Portugal