Table. 4 Experimental Engine Specifications

Fig.6 Pressure Diagram

Fig.7 Change in Lag and Exhaust Gas Temperature

Fig.8 Change in CO₂, CO, O₂ Concetration

Fig.9 Change in NOx, NOx13, NO₂, NO, SO₂ Concentration

　

Table 4 states the experimental conditions, in which the engine speed and load are kept constant at 2200 rpm and 75% of continuous rated output while the mixing ratio has been changed from 10 to 20 and 30 vol.%. The experiments were carried out without preheating the fuel oil, under atmospheric temperature (about 25℃).

　

4. Results and Discussions

　

Figure 6 shows the combustion pressure diagram. Along with the increase of WPD mixing ratio, although exhaust gas temperature does not change the maximum combustion pressure decreases and the combustion retards. Figure 7 indicates the change in ignition lag and exhaust gas temperature. Figures 8 and 9 show the change in the concentration of components of the exhaust gas. Regardless of the change in the WPD ratio CO, CO₂, O₂ concentration is stable around 700 ppm, 8%, and 10.5% respectively. However, as the WPD mixing ratio increases NOx concentration gradually increase 19% from 1180 to 1400 ppm due to the rise in combustion temperature.

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