Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study
The statistics of mean fluid velocity components conditional in unburned reactants and fully burned products in the context of Reynolds Averaged Navier Stokes (RANS) simulations have been studied using a Direct Numerical Simulation database of statistically planar turbulent premixed flame representi...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2011-01-01
|
| Series: | Journal of Combustion |
| Online Access: | http://dx.doi.org/10.1155/2011/628208 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832556698684882944 |
|---|---|
| author | Nilanjan Chakraborty Andrei N. Lipatnikov |
| author_facet | Nilanjan Chakraborty Andrei N. Lipatnikov |
| author_sort | Nilanjan Chakraborty |
| collection | DOAJ |
| description | The statistics of mean fluid velocity components conditional in unburned reactants and fully burned products in the context of Reynolds Averaged Navier Stokes (RANS) simulations have been studied using a Direct Numerical Simulation database of statistically planar turbulent premixed flame representing the corrugated flamelets regime combustion. Expressions for conditional mean velocity and conditional velocity correlations which are derived based on a presumed bimodal probability density function of reaction progress variable for unity Lewis number flames are assessed in this study with respect to the corresponding quantities extracted from DNS data. In particular, conditional surface averaged velocities (ui)¯Rs and the velocity correlations (uiu)j¯Rs in the unburned reactants are demonstrated to be effectively modelled by the unconditional velocities (ui)¯R and velocity correlations (uiuj)¯R, respectively, for the major part of turbulent flame brush with the exception of the leading edge. By contrast, conditional surface averaged velocities (ui)¯Ps and the velocity correlations (uiu)j¯Ps in fully burned products are shown to be markedly different from the unconditional velocities (ui)¯P and velocity correlations (uiuj)¯P, respectively. |
| format | Article |
| id | doaj-art-a8c9c897a37c48ad88ae2467d362d287 |
| institution | Kabale University |
| issn | 2090-1968 2090-1976 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Combustion |
| spelling | doaj-art-a8c9c897a37c48ad88ae2467d362d2872025-02-03T05:44:37ZengWileyJournal of Combustion2090-19682090-19762011-01-01201110.1155/2011/628208628208Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation StudyNilanjan Chakraborty0Andrei N. Lipatnikov1School of Mechanical and System Engineering, Newcastle University, Claremont Road, Newcastle-upon-tyne NE1 7RU, UKDepartment of Applied Mechanics, Chalmers University of Technology, 412 96, Gothenberg, SwedenThe statistics of mean fluid velocity components conditional in unburned reactants and fully burned products in the context of Reynolds Averaged Navier Stokes (RANS) simulations have been studied using a Direct Numerical Simulation database of statistically planar turbulent premixed flame representing the corrugated flamelets regime combustion. Expressions for conditional mean velocity and conditional velocity correlations which are derived based on a presumed bimodal probability density function of reaction progress variable for unity Lewis number flames are assessed in this study with respect to the corresponding quantities extracted from DNS data. In particular, conditional surface averaged velocities (ui)¯Rs and the velocity correlations (uiu)j¯Rs in the unburned reactants are demonstrated to be effectively modelled by the unconditional velocities (ui)¯R and velocity correlations (uiuj)¯R, respectively, for the major part of turbulent flame brush with the exception of the leading edge. By contrast, conditional surface averaged velocities (ui)¯Ps and the velocity correlations (uiu)j¯Ps in fully burned products are shown to be markedly different from the unconditional velocities (ui)¯P and velocity correlations (uiuj)¯P, respectively.http://dx.doi.org/10.1155/2011/628208 |
| spellingShingle | Nilanjan Chakraborty Andrei N. Lipatnikov Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study Journal of Combustion |
| title | Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study |
| title_full | Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study |
| title_fullStr | Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study |
| title_full_unstemmed | Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study |
| title_short | Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study |
| title_sort | statistics of conditional fluid velocity in the corrugated flamelets regime of turbulent premixed combustion a direct numerical simulation study |
| url | http://dx.doi.org/10.1155/2011/628208 |
| work_keys_str_mv | AT nilanjanchakraborty statisticsofconditionalfluidvelocityinthecorrugatedflameletsregimeofturbulentpremixedcombustionadirectnumericalsimulationstudy AT andreinlipatnikov statisticsofconditionalfluidvelocityinthecorrugatedflameletsregimeofturbulentpremixedcombustionadirectnumericalsimulationstudy |