Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach
The potential of a progress variable formulation for predicting autoignition and subsequent kernel development in a nonpremixed jet flame is explored in the LES (Large Eddy Simulation) context. The chemistry is tabulated as a function of mixture fraction and a composite progress variable, which is d...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Journal of Combustion |
| Online Access: | http://dx.doi.org/10.1155/2012/780370 |
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| author | Rohit Kulkarni Wolfgang Polifke |
| author_facet | Rohit Kulkarni Wolfgang Polifke |
| author_sort | Rohit Kulkarni |
| collection | DOAJ |
| description | The potential of a progress variable formulation for predicting autoignition and subsequent kernel development in a nonpremixed jet flame is explored in the LES (Large Eddy Simulation) context. The chemistry is tabulated as a function of mixture fraction and a composite progress variable, which is defined as a combination of an intermediate and a product species. Transport equations are solved for mixture fraction and progress variable. The filtered mean source term for the progress variable is closed using a probability density function of presumed shape for the mixture fraction. Subgrid fluctuations of the progress variable conditioned on the mixture fraction are neglected. A diluted hydrogen jet issuing into a turbulent coflow of preheated air is chosen as a test case. The model predicts ignition lengths and subsequent kernel growth in good agreement with experiment without any adjustment of model parameters. The autoignition length predicted by the model depends noticeably on the chemical mechanism which the tabulated chemistry is based on. Compared to models using detailed chemistry, significant reduction in computational costs can be realized with the progress variable formulation. |
| format | Article |
| id | doaj-art-25ab1d8c656c4ead980a943392366f8d |
| institution | Kabale University |
| issn | 2090-1968 2090-1976 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Combustion |
| spelling | doaj-art-25ab1d8c656c4ead980a943392366f8d2025-02-03T06:46:13ZengWileyJournal of Combustion2090-19682090-19762012-01-01201210.1155/2012/780370780370Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable ApproachRohit Kulkarni0Wolfgang Polifke1Lehrstuhl für Thermodynamik, TU München, Boltzmannstraße 15, Garching, GermanyLehrstuhl für Thermodynamik, TU München, Boltzmannstraße 15, Garching, GermanyThe potential of a progress variable formulation for predicting autoignition and subsequent kernel development in a nonpremixed jet flame is explored in the LES (Large Eddy Simulation) context. The chemistry is tabulated as a function of mixture fraction and a composite progress variable, which is defined as a combination of an intermediate and a product species. Transport equations are solved for mixture fraction and progress variable. The filtered mean source term for the progress variable is closed using a probability density function of presumed shape for the mixture fraction. Subgrid fluctuations of the progress variable conditioned on the mixture fraction are neglected. A diluted hydrogen jet issuing into a turbulent coflow of preheated air is chosen as a test case. The model predicts ignition lengths and subsequent kernel growth in good agreement with experiment without any adjustment of model parameters. The autoignition length predicted by the model depends noticeably on the chemical mechanism which the tabulated chemistry is based on. Compared to models using detailed chemistry, significant reduction in computational costs can be realized with the progress variable formulation.http://dx.doi.org/10.1155/2012/780370 |
| spellingShingle | Rohit Kulkarni Wolfgang Polifke Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach Journal of Combustion |
| title | Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach |
| title_full | Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach |
| title_fullStr | Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach |
| title_full_unstemmed | Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach |
| title_short | Large Eddy Simulation of Autoignition in a Turbulent Hydrogen Jet Flame Using a Progress Variable Approach |
| title_sort | large eddy simulation of autoignition in a turbulent hydrogen jet flame using a progress variable approach |
| url | http://dx.doi.org/10.1155/2012/780370 |
| work_keys_str_mv | AT rohitkulkarni largeeddysimulationofautoignitioninaturbulenthydrogenjetflameusingaprogressvariableapproach AT wolfgangpolifke largeeddysimulationofautoignitioninaturbulenthydrogenjetflameusingaprogressvariableapproach |