The effect of direct water injection on unsteady fuel spray combustion

H. Tajima, K. Takasaki, T. Takaishi, S. Murakami

Research output: Contribution to conferencePaper

Abstract

'Direct water injection (DWI)' is a method in which water is injected directly into the combustion chamber under high injection pressure from dedicated injectors other than fuel injectors. DWI is supposed to have improving effects not only on NOx emission by decreasing flame temperature but also on PM by promoting combustion inside the diesel engines with a certain timing of water injection, which could be different from those for NOx reduction. In this paper, the potential of the DWI with the later injection timing (abbreviated to 'LDWI') was investigated in detail by using numerical simulations and several experiments. Unlike the earlier DWI usual in NOx reduction, LDWI around the end of fuel injection greatly improved the combustion during the after-burning period. In observation of flame propagation processes in a visual constant-volume combustion chamber, the water spray injected just before the end of fuel injection proved to reduce the soot formation during after-burning stage. This agreed well with prediction results by the spray model calculation. It was also confirmed in visual engine tests with LDWI that the after-burning was much shortened and heat release from residual spray cores was accelerated along with the reduction of soot formation.

Original languageEnglish
Publication statusPublished - Dec 1 2006
Event10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan
Duration: Aug 27 2006Sep 1 2006

Other

Other10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
CountryJapan
CityKyoto
Period8/27/069/1/06

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All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

Tajima, H., Takasaki, K., Takaishi, T., & Murakami, S. (2006). The effect of direct water injection on unsteady fuel spray combustion. Paper presented at 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006, Kyoto, Japan.