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Study on NOx Control in Direct-Injection PCCI Combustion - Fundamental Investigation Using a Constant-Volume Vessel
Technical Paper
2006-01-0919
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of fuel injection conditions (injection pressure, nozzle orifice diameter and fuel injection quantity) on NOx formation in direct-injection Premixed Charge Compression Ignition (DI-PCCI) combustion were investigated using a constant-volume vessel and a total gas-sampling device. The results show that promotion of fuel-air mixing reduces final NOx mass accompanying a delayed hot flame. In particular, under low oxygen mole fraction conditions, in addition to the hot flame delay, the promotion of fuel-air mixing results in a lower heat release rate. In this case, the final NOx mass is further reduced. For a fixed nozzle orifice diameter, the final NOx mass is reduced with increasing injection pressure. This effect is remarkable for smaller nozzle orifice diameters. Regardless of the oxygen mole fraction, under the low injection fuel quantity condition, enhancement of fuel-air mixing reduces the final NOx mass per released heat. However, the injection conditions have only a slight effect on the final NOx mass per heat release when the quantity of injected fuel exceeds a certain level.
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Authors
- Yasutaka Kitamura - Graduate School of Energy Science, Kyoto University
- Sung-Sub Kee - Graduate School of Energy Science, Kyoto University
- Ali Mohammadi - Graduate School of Energy Science, Kyoto University
- Takuji Ishiyama - Graduate School of Energy Science, Kyoto University
- Masahiro Shioji - Graduate School of Energy Science, Kyoto University
Topic
Citation
Kitamura, Y., Kee, S., Mohammadi, A., Ishiyama, T. et al., "Study on NOx Control in Direct-Injection PCCI Combustion - Fundamental Investigation Using a Constant-Volume Vessel," SAE Technical Paper 2006-01-0919, 2006, https://doi.org/10.4271/2006-01-0919.Also In
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