Investigation of the effects of ozone usage on combustion control and exhaust emissions in reactivity controlled compression ignition

The purpose of the study prepared is to minimize the damages caused by the emissions from diesel engines. Studies have been examined and it has been seen that the RCCI concept is appropriate. In this thesis, the effects of using ozone gas in RCCI engines have been experimentally studied. A single cylinder diesel engine was used in the experiments. In order to use low reactivity fuel, a port type fuel injector is placed in the intake manifold in accordance with the RCCI concept. In the studies, diesel was used as HRF and isooctane as LRF. Ozone gas, the subject of the study, was produced by an ozone generator and sent to the cylinder through the suction port. At the same time, the ozone generator was fed with pure oxygen by an oxygen cylinder. In the experiments, the engine speed was kept constant at 2400 rpm and the engine load was realized at 20%, 40% and 60%. The amount of ozone for each load has been studied as 0, 100, 200 and 300 ppm. In all parameters, 15%, 30% and 45% RCCI ratios were studied. When the results are examined, it is seen that in the experiments where RCCI is not used in all loads, the CO emission decreases with the increase of the ozone amount, increases with the use of LRF and ozone together, but there is a decrease in the amount of CO with the use of both RCCI and ozone at 60% load. Again, in studies conducted, it was observed that HC emission increased in LRF use, but HC emissions decreased as a result of increasing ozone rates. It was determined that NO emission increased with the use of both ozone and LRF at medium and high loads, but the use of LRF at 20% load reduced NO emission. Finally, with the increase of LRF ratio, a decrease in soot emission was observed in all loads, and it was determined that ozone was effective in reducing soot emission without the use of LRF or LRF. Finally, by using the RCCI concept, low temperature combustion was achieved in the cylinder.