INTERACTION BETWEEN CHEMISTRY AND MICRO-MIXING MODELING IN TRANSPORTED PDF SIMULATIONS OF TURBULENT NON-PREMIXED FLAMES

Abstract

A comparative study is presented of the impact of chemistry modeling on the behavior of 2 micro-mixing models in transported scalar PDF simulations of turbulent non-premixed flames. The micro-mixing models are CD (modified Curl's Coalescence/Dispersion) and EMST (Euclidean Minimum Spanning Tree). A first order non-linear k-ε turbulence model is applied for the turbulent flow and mixing fields. Three C₁ chemistry models are considered: 2 skeletal schemes containing 16 species and 31, resp. 41 elementary reactions, and one augmented reaction scheme (ARM), consisting of 9 independent species and 5 global reaction steps. The test cases considered are the piloted turbulent Delft Flame III jet diffusion flame and the bluff-body stabilized turbulent non-premixed Sydney HM1 flame. With EMST the chemistry model choice has a negligible effect on the micro-mixing model behavior or on the results in physical space. With CD on the other hand, larger differences appear.

Keywords:

• chemistry mechanisms
• micro-mixing models
• non-linear k-εmodel
• transported scalar PDF

ACKNOWLEDGMENTS

The first author is Postdoctoral Fellow of the Fund of Scientific Research – Flanders (Belgium) (FWO-Vlaanderen). Part of the research was financed by the Fund of Scientific Research – Flanders (Belgium) (FWO-Vlaanderen) through FWO-project G.0070.03.

This collaborative research was supported by the Spanish MEC under Project #ENE2005-09190-C04-04/CON.