Effect of Unsteady Flow Field on Spray Feature in a DISI Engine

Tomohiro Ishiguro･Shota Minami･Eriko Matsumura･Jiro Senda (Doshisha University)･Shigenori Haraguchi･Yoshihisa Sato (Honda Motor)

In a DISI engine, fuel deposition on the wall is a factor in the formation of PM. In this study, the velocity distribution of the in-cylinder flow field was analyzed using a rapid compression and expansion machine and the spray features during the formation process of spray injected into an unsteady tumble flow field were analyzed by changing the injection pressure and injection timing as parameters.

Development of a Prediction Model of Soot Particle Size Distribution Applicable for Design Calculations of Internal Combustion Engines (3rd Report)
-Validation for 5-Component Gasoline Surrogate-

Jun Hashimoto･Kazumasa Ito (Oita University)･Tatsuya Kuboyama (Chiba University)･Yasuyuki Sakai (Ibaraki University)･Kazuhiro Akihama (Nihon University)

In previous work, we have proposed a soot prediction model which can predict the soot particle size distribution and is applicable to design calculations of internal combustion engines. The model was validated for experimental results measured by using burner stabilized stagnation flames and a DISI engine for iso-octane/n-heptane/toluene blended fuels. In this study, the model was extended to a 5-component gasoline surrogate, which is composed of iso-octane/n-heptane/toluene/iso-pentane/Trimethylbenzene and reproduces the sooting characteristics of gasoline, and validated against the experimental results of a DISI engine.