Three-Dimensional Computation of the Effects of the Swirl Ratio in Direct-Injection Diesel Engines on NOx and Soot Emissions

Paper #:
  • 961125

Published:
  • 1996-05-01
Citation:
Ogawa, H., Matsui, Y., Kimura, S., and Kawashima, J., "Three-Dimensional Computation of the Effects of the Swirl Ratio in Direct-Injection Diesel Engines on NOx and Soot Emissions," SAE Technical Paper 961125, 1996, https://doi.org/10.4271/961125.
Pages:
10
Abstract:
Three-dimensional computation has been applied to analyze combustion and emission characteristics in direct-injection diesel engines. A computational code called TurboKIVA was used to investigate the effects of the swirl ratio, one of the fundamental factors related to combustion control, on combustion characteristics and NOx and soot emissions. The code was first modified to calculate soot formation and oxidation and the precise behavior of fuel drops on the combustion chamber wall. As a result of improving calculation accuracy, good agreement was obtained between the measured and predicted pressure, heat release rate and NOx and soot emissions. Using this modified version of TurboKIVA, the effects of the swirl ratio on NOx and soot emissions were investigated. The computational results showed that soot emissions were reduced with a higher swirl ratio. However, a further increase in the swirl ratio produced greater soot emissions. A careful examination of the fuel spray formation and air-fuel mixing process revealed the reasons for the increased soot emissions. Based on these results, this paper describes the effects of the swirl ratio on combustion characteristics and NOx and soot emissions and the mechanism of soot formation and oxidation in DI diesel engines.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2009-12-15
Training / Education
2017-12-18
Training / Education
2018-03-27