Experimental Analysis of Partially Premixed Charge in a Diesel Engine with Jatropha Oil Methyl Ester and Diesel Blends
Homogeneous charge compression ignition (HCCI) is an alternative combustion process which received considerable interest to meet the stringent emission norms. One such technology developed is partially premixed charge compression ignition (PCCI) combustion mode a variant of HCCI combustion mode. In this work an attempt has been made to experimentally analyze the performance and emission characteristics with Premixed Charge Compression Ignition (PCCI) mode assisted with pilot injection. Experiments were conducted in a modified single cylinder water-cooled diesel engine employing a conceptual system known as transient state fuel induction with different modes such as diesel and biodiesel conventional mode, diesel PCCI–diesel, biodiesel PCCI-diesel and biodiesel PCCI-biodiesel modes. In the present work, diesel and jatropha methyl ester was used premixed fuel along with conventional injection of either diesel or 20% jatropha oil methyl ester blend with diesel. The results indicate that brake thermal efficiency decreases marginally as the methyl ester in the conventional and PCCI modes and HC, CO emissions are higher and soot levels are lower in the case of biodiesel PCCI-biodiesel mode.
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