| Autor: |
Kazuhisa Inagaki, Tsutomu Kawae, Teruaki Kondo, Kazuaki Nishikawa, Yo Usui |
| Zdroj: |
Transactions of the Society of Automotive Engineers of Japan; Sep2024, Vol. 55 Issue 5, p829-835, 7p |
| Abstrakt: |
We propose a combustion concept for significant NOx reduction by stratifying water within the engine cylinder. Through 3D-CFD analysis, we found that stratifying water around the upper region of the piston cavity results in much higher NOx reduction compared to homogeneously distributing water in the cylinder. To achieve this stratified water distribution, we developed a multi-hole fan spray nozzle and installed it on the engine head to establish a system for direct water injection into the cylinder. Experimental results at an IMEP of 0.8 MPa showed that under conditions where the mass of water injection accounted for 50% of the fuel mass, optimizing the timing of water injection led to an approximately 40% reduction in NOx. Furthermore, dividing the water injection into two stages resulted in a 50% reduction in soot. When applying Exhausted Gas Recirculation (EGR) under these conditions with equivalent soot concentrations, we observed up to a 75% reduction in NOx compared to not using water injection. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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