Large Eddy Simulation of MILD combustion using finite rate chemistry: Effect of combustion sub-grid closure
| Autor: | Alessandro Parente, Zhiyi Li, Alberto Cuoci |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Partially Stirred Reactor Adelaide JHC burner Detailed chemistry Implicit combustion models MILD combustion Subgrid combustion models 020209 energy General Chemical Engineering Combustion 02 engineering and technology 7. Clean energy 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Physics::Chemical Physics Physical and Theoretical Chemistry Jet (fluid) Turbulence Mechanical Engineering Laminar flow Mechanics Damköhler numbers Combustor Large eddy simulation |
| Zdroj: | Proceedings of the Combustion Institute |
| ISSN: | 1540-7489 |
| DOI: | 10.1016/j.proci.2018.09.033 |
| Popis: | In this work, we present a detailed comparison between the conventional Partially Stirred Reactor (PaSR) combustion model and two implicit combustion models, named Quasi Laminar Finite Rate (QLFR) model and Laminar Finite Rate (LFR) model, respectively. Large Eddy Simulation (LES) is employed and the Adelaide Jet in Hot Co-flow (AJHC) burner is chosen as validation case. In the implicit combustion models, the filtered source term comes directly from the chemical term, without inclusion of turbulence effects. Results demonstrate that the two implicit models behave similarly to the conventional PaSR model, for the mean and root-mean-square of the temperature and species mass fractions, and that all models provide very satisfactory predictions, especially for the mean values. This justifies the use of implicit combustion models in low Damköhler number (Da ≤ 1.0) systems. The QLFR model allows to reduce the computational cost of about three times, compared to the LFR model. Moreover, the comparison between two 4-step global mechanisms and the KEE58 mechanism proves the importance of finite rate chemistry in MILD combustion. SCOPUS: ar.j info:eu-repo/semantics/published |
| Databáze: | OpenAIRE |
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