A DNS evaluation of mixing models for transported PDF modelling of turbulent nonpremixed flames

Krisman, Alex; Tang, Joshua C. K.; Hawkes, Evatt R.; Lignell, David O.; Chen, Jacqueline H.

doi:10.1016/j.combustflame.2014.01.009

A DNS evaluation of mixing models for transported PDF modelling of turbulent nonpremixed flames

Journal Article · Fri Jan 31 23:00:00 EST 2014 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2014.01.009· OSTI ID:1565130

Krisman, Alex ^[1]; Tang, Joshua C. K. ^[1]; Hawkes, Evatt R. ^[1]; Lignell, David O. ^[2]; Chen, Jacqueline H. ^[3]

Univ. of New South Wales, Sydney, NSW (Australia)
Brigham Young Univ., Provo, UT (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Transported probability density function (TPDF) approaches are well suited to modelling turbulent, reacting, variable density flows. One of the main challenges to the successful deployment of TPDF methods is accurately modelling the unclosed molecular mixing term. This study examines three of the most widely used mixing models: the Interaction by Exchange with the Mean (IEM), Modified Curl (MC) and Euclidean Minimum Spanning Tree (EMST) models. Direct numerical simulation (DNS) data-sets were used to provide both initial conditions and inputs needed over the course of the runs, including the mean flow velocities, mixing frequency, and the turbulent diffusion coefficient. The same chemical mechanism and thermodynamic properties were used, allowing the study to focus on the mixing model. The simulation scenario was a one-dimensional, nonpremixed, turbulent jet flame burning either a syngas or ethylene fuel stream that featured extinction and reignition. This test scenario was selected because extinction and reignition phenomena are sensitive to the mixing model. Three DNS cases were considered for both the syngas and ethylene cases with a parametric variation of Reynolds and Damköhler numbers, respectively. Extinction events became more popular with increasing Reynolds number in the syngas cases and with decreasing Damköhler number in the ethylene cases. The model was first tested with the mixing frequency defined from the dissipation rate and variance of mixture fraction. With this definition, for the syngas cases this study finds that the TPDF method is successful at predicting flame extinction and reignition using all three mixing models for the relatively lower and intermediate Reynolds number cases, but that all models under-predict reignition in the relatively higher Reynolds number case. In the ethylene fuelled cases, only the EMST mixing model correctly predicts the reignition event for the two higher Damköhler number cases, yet, in the lowest Damköhler number case the EMST model over-predicts reignition and the IEM and MC models under-predict it. Mixing frequency was then modelled based on the turbulence frequency and a model constant $$C_{\phi}$$, the ratio of scalar to mechanical mixing rates. The DNS cases were reexamined with this definition and the findings suggested that the optimal value for $$C_{\phi}$$ is mixing model and case dependent. In particular, it was found in the ethylene case considered that reignition could be achieved with the IEM and MC models by adjusting the value of $$C_{\phi}$$.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; AC04-94AL85000

OSTI ID:: 1565130

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 8 Vol. 161; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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