The Interaction Between Nitric Oxide and Hydrocarbon Oxidation Chemistry in a Spark Ignition Engine 972889
This research investigated the effects of nitric oxide (NO) on hydrocarbon (HC) emissions from a homogeneous charge spark ignition engine. Nitric oxide production inside the engine was eliminated by operating the engine on mixtures of n-butane/O2 and argon mixed from bottled gases in a custom-designed intake system. The effects of NO on HC emissions were studied by adding NO to the intake. No changes in HC emissions were measured with NO addition, although NO addition did promote autoignition chemistry. Experiments were also performed with nitrogen dilution to confirm that the argon results are applicable to normal engine operation. With nitrogen dilution there was again no effect of NO addition on HC emissions. The lack of a chemical effect of NO on HC emissions implies that a majority of the HC consumption occurs at temperatures higher than 1500 K.
Citation: Eng, J., Leppard, W., Najt, P., and Dryer, F., "The Interaction Between Nitric Oxide and Hydrocarbon Oxidation Chemistry in a Spark Ignition Engine," SAE Technical Paper 972889, 1997, https://doi.org/10.4271/972889. Download Citation
J. A. Eng, W. R. Leppard, P. M. Najt, F. L. Dryer
General Motors Research
International Fuels & Lubricants Meeting & Exposition
Combustion & Emission Control for SI Engines-PT-121, Combustion and Emission Formation in SI Engines-SP-1300, SAE 1997 Transactions - Journal of Fuels and Lubricants-V106-4