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This paper highlights the combustion, performance and emission characteristics of a diesel engine using 25% of rubber seed oil methyl ester-diesel blend (RSME25) with different proportions of Dimethyl carbonate (DMC) (10%, 20%, and 30%) inducted through fumigation technique. Fumigation is a method of injecting liquid fuel (DMC) in a vaporized form into the intake manifold and the biodiesel blend is injected into the engine cylinder directly through the fuel injector in a diesel engine. The experiment was conducted in a diesel engine, fueled with 25% rubber seed oil methyl ester blends with diesel (RSME25) and different proportions of Dimethyl carbonate (10%, 20%, and 30%) fumigation with the help of a vaporizer and an injector. The results indicated that RSME25 with fumigation of DMC showed an overall ignition delay  of  3°CA was increased for all the percentage of fumigation as compared with diesel and RSME25 without fumigation at full load. Also, the RSME25 with 30% of fumigated DMC gave improved performance and reduction in exhaust gas emissions than other proportions. The nitric oxide (NO) emission and smoke opacity were found to be lowered by 28% and 36%, respectively, for RSME25 with 30% DMC fumigation, when compared to diesel at full load.

Performance and emission characteristics of diesel engine using biodiesel with the effect of Dimethyl carbonate (DMC) fumigation