G. Takeshi Sato

Temperature and Mixing Effects on NO x and Particulate

The effect of intake oxygen concentration on both the flame temperature and emission of NOx and particulates from a direct injection diesel engine is reported. Nitrogen oxide emissions from a direct injection diesel engine was correlated with calculated stoichiometric flame temperature, yielding −143,000 cal/mole for the overall activation energy for the processes involved

Experimental study on unsteady gas jet

In order to clarify the mixture formation process of the direct injection gas engine, helium gas was injected into a quiescent atmosphere. The time- and space-resolved velocity, pressure and concentration distributions were measured in the free unsteady gas jet and in the wall impinging unsteady gas jet. They were also obtained for the unsteady gas jet impinging onto a projection on a wall to enhance mixture formation. Empirical equations for the unsteady free jet were obtained, and the mixture formation mechanism of the wall impinging unsteady gas jet were clarified. The unsteady gas jet impinging onto the projection on a wall entrains much more air than the unsteady wall impinging jet. 8 refs., 20 figs.