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Combustion Modeling of Diesel Combustion with Partially Premixed Conditions
Technical Paper
2007-01-0163
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Two turbulent combustion modeling approaches, which were large eddy simulations in conjunction with detailed kinetics (LES-CHEMKIN) and Reynolds Averaged Navier Stokes with detailed kinetics (RANS-CHEMKIN), were used to model two partially premixed engine conditions. The results were compared with average pressure and heat release data, as well as images of in-cylinder ignition chemiluminescence and OH radical distributions. Both LES-CHEMKIN and RANS-CHEMKIN match well with experimental average data. However, LES-CHEMKIN has advantages over RANS-CHEMKIN in predicting the details of location of ignition sites, temperature as well as OH radical distributions. Therefore, LES offers more realistic representations of the combustion process. As a further improvement aiming at saving computational cost and accounting for turbulence-chemistry interactions, a flamelet time scale (FTS) combustion model is coupled with CHEMKIN to predict the entire combustion process. In this new approach (i.e. LES-CHEMKIN-FTS), CHEMKIN was responsible for the low-temperature phase to provide sufficient chemical kinetic information whereas the FTS model played its role in the high-temperature phase to account for subgrid mixing-chemistry effects and save CPU time. We showed that LES-CHEMKIN-FTS performed better than LES-CHEMKIN under conventional diesel-type combustion.
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Authors
- Bing Hu - Engine Research Center, University of Wisconsin, Madison
- Rahul Jhavar - Engine Research Center, University of Wisconsin, Madison
- Satbir Singh - Engine Research Center, University of Wisconsin, Madison
- Rolf D. Reitz - Engine Research Center, University of Wisconsin, Madison
- Christopher J. Rutland - Engine Research Center, University of Wisconsin, Madison
Citation
Hu, B., Jhavar, R., Singh, S., Reitz, R. et al., "Combustion Modeling of Diesel Combustion with Partially Premixed Conditions," SAE Technical Paper 2007-01-0163, 2007, https://doi.org/10.4271/2007-01-0163.Also In
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