Study on the Mechanism of Soot Reduction by Multi-Injection Coupled with EGR

Jing Luo; Hai Feng Liu

doi:10.4028/www.scientific.net/AMR.805-806.1759

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 805-806Study on the Mechanism of Soot Reduction by...

Study on the Mechanism of Soot Reduction by Multi-Injection Coupled with EGR

Abstract:

The effects of multiple injections coupled with medium EGR (25% - 30%) on heavy duty diesel engine were investigated. Injection timing and mass were adjusted with different injection strategies (main-post and pilot-main) to study the influence of these parameters on combustion and emissions. The mechanism of soot emission reduction was discussed. Results indicate that, at fixed total injection quantity and EGR rate, NOx is reduced, while soot is decreased followed by an increasing with increasing post injection quantity; NOx nearly kept constant and soot declined before rising with lager main-post interval. Optimum post injection could accelerate soot oxidation rate. Pilot injection has no positive impact on NOx, while soot decreases with less pilot fuel mass and lager pilot-main interval. Optimum pilot injection could be beneficial for a better mixture property. The acceleration of soot oxidation rate is the basic reason of soot emission reducing by multiple injections.

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Periodical:

Advanced Materials Research (Volumes 805-806)

Pages:

1759-1762

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.805-806.1759

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Online since:

September 2013

Authors:

Jing Luo, Hai Feng Liu

Keywords:

Mechanism, Multi-Injection, NO_x, Soot

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