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NOx and N2O formation in HCCI engines
Technical Paper
2005-01-0126
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Calculations using homogeneous and stochastic reactor models were performed in order to find an explanation to observed properties of NOx HCCI engines. It was found that for moderate NOx levels, N2O reactions play an important role in the NOx formation. Further, the high proportions of NO2 found in from some HCCI engines is due to high temperature inhomogeneities, poor mixing and slow overall combustion. N2O is often emitted from HCCI combustion. The levels of NOx in the exhausts are highly sensitive to temperature; however N2O has a weak negative dependence on temperature. While fuel rich operation naturally leads to high temperatures and thus high NOx levels; once the temperature effects are decoupled the fuel rich conditions themselves has a favorable effect on low-NOx engine operation.
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Authors
- Per Amnéus - Division of Combustion Physics, Lund Institute of Technology
- Fabian Mauss - Division of Combustion Physics, Lund Institute of Technology
- Markus Kraft - Department of Chemical Engineering, University of Cambridge
- Andreas Vressner - Department of Heat and Power Engineering, Lund Institute of Technology
- Bengt Johansson - Department of Heat and Power Engineering, Lund Institute of Technology
Citation
Amnéus, P., Mauss, F., Kraft, M., Vressner, A. et al., "NOx and N2O formation in HCCI engines," SAE Technical Paper 2005-01-0126, 2005, https://doi.org/10.4271/2005-01-0126.Also In
Homogeneous Charge Compression Ignition (HCCI) Combustion 2005
Number: SP-1963; Published: 2005-04-11
Number: SP-1963; Published: 2005-04-11
Homogeneous Charge Compression Ignition (HCCI) Combustion on CD-ROM from the SAE 2005 World Congress
Number: SP-1982CD; Published: 2005-04-11
Number: SP-1982CD; Published: 2005-04-11
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