Abstract
Premixed lean diesel combustion (PREDIC) achieves very low NOx emissions as a result of early fuel injection. Another consequence of such early injection is an increase in the amount of fuel spray reaching the cylinder wall. This results in higher fuel consumption and THC emissions. Another shortfall is that compression ignition timing control is difficult because of its dependence upon the incylinder temperature. These problems can be addressed by utilizing an impingement spray, with two nozzles. In this study, this type of spray was analyzed on spray position control, larger spray volume, and less wall wetting, among others. Also, the impingement spray structure was analyzed by cross-sectional observation using laser induced fluorescence. Spray penetration, high-density area, and plume area were measured. The impinging sprays enhance each other's spreading and mixture formation. Higher injection pressure has little effect on spray penetration and high-density area.
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