Performance and emissions characteristics of a diesel engine with internal jet piston using biodiesel

The paper reports an attempt to test the feasibility of Jatropha methyl ester as a fuel in the engine fuel of a compression ignition engine (C.I.) with turbulence inducements in the combustion chamber. The inefficient mixing of biodiesel oils with air contributes to incomplete combustion. These problems can be eliminated by enhancing in‐cylinder turbulence by providing two holes on the piston crown (internal jet piston) and esterification of the vegetable oil into biodiesel. The performance characteristics revealed that the brake thermal efficiency of the Jatropha methyl ester with an internal jet piston was higher than with a base engine piston. The internal jet piston operation with Jatropha methyl ester exhibited desirable characteristics for other emissions such as lower carbon monoxide (CO), hydrocarbons (HCs) and smoke. The oxides of nitrogen (NOx) emissions were higher for the internal jet piston with increasing load, compared to the base engine piston.