RANS Simulations of a Series of Turbulent V-Shaped Flames using Conditional Source-term Estimation
| Autor: | Cecile Devaud, D. Dovizio, A. Debbagh |
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| Rok vydání: | 2016 |
| Předmět: |
010304 chemical physics
Series (mathematics) Turbulence General Chemical Engineering General Physics and Astronomy Thermodynamics Mechanics Combustion 01 natural sciences Integral equation 010305 fluids & plasmas Term (time) Physics::Fluid Dynamics 0103 physical sciences Sensitivity (control systems) Physics::Chemical Physics Physical and Theoretical Chemistry Reynolds-averaged Navier–Stokes equations Variable (mathematics) |
| Zdroj: | Flow, Turbulence and Combustion. 96:891-919 |
| ISSN: | 1573-1987 1386-6184 |
| Popis: | In the present study, Reynolds Averaged Navier Stokes (RANS) simulations are applied to a series of turbulent V-shaped flames. Two formulations of Conditional Source-term Estimation (CSE) are developed using singly and doubly conditioned averages for turbulent premixed and partially premixed flames, respectively. Detailed chemistry is included. Conditionally averaged chemical source terms are closed by conditional averaged scalars which are obtained by inverting an integral equation. The objectives are to study a turbulent premixed V-shaped flame using the premixed CSE approach and apply the Doubly Conditional CSE (DCSE) combustion model to a case of stratified combustion. The partially premixed implementation involves double conditioning on two variables, mixture fraction and progress variable. The present study represents the first application of DCSE for a series of turbulent stratified flames. First, CSE is analysed for fully premixed conditions. A sensitivity analysis on the number of CSE ensembles and different scalar dissipation model closures is performed. Good results are obtained in terms of velocity and progress variable profiles. Finally, the partially premixed formulation is applied to the stratified case at three different conditions, corresponding to two different turbulence grids and three different profiles of the equivalence ratio, providing promising results. |
| Databáze: | OpenAIRE |
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