Abstract:
In this study a conventional diesel engine assembly is modified to work in the dual fuel mode with LPG as primary fuel and diesel as the pilot fuel. In this work, tests were conducted on a TEXVEL four stroke single cylinder diesel engine running with LPG in dual fuel mode of operation with diesel. Work reported is an attempt to study the extent to which LPG can be carbureted through manifold induction in a diesel engine. The investigation has been conducted to obtain brake thermal efficiency, emissions and total fuel consumption at various diesel substitutions and outputs.
There is an increase in the brake thermal efficiency from 40.4% in the diesel mode to 43.8% in the dual fuel mode at full load due to a rise in the combustion rate. However poor ignition leads to a drop in the brake thermal efficiency and increase in hydrocarbon and CO levels at low loads particularly with high diesel substitutions. It is seen that the CO levels reduce in the dual fuel mode with increase in the diesel substitution up to an output of full load. It is also noticed that the unburnt HC emission reduces from 810 parts per million (PPM) to 710 PPM with the dual fuel mode at full load.
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Very clear post about the diesel fuel!