Noise emission research of diesel engine powered with mixture of diesel oil and methyl esters

Abstract

Generation of noise by reciprocating internal combustion engines is the effect of operation performed by them. Modernization of fuel feeding the power unit makes it possible to limit the emitted sounds preserving the engine’s high operating parameters. The conducted studies concerned comparison of the noise emission generated by a combustion engine fed by diesel oil and a mixture of fatty acids methyl esters (bio component) and the diesel oil in proportions 10%, 30% and 50% of bio component additive, at standard settings of the fuel injection controller. The subject matter of the tests there was the combustion engine with self-ignition of the power of 80 kW with direct ignition common rail, assembled in a vehicle. Adaptation was performed in the selected means of transport making it possible to change quickly the feeding fuel. The test was conducted in the chassis bed. It results from the conducted tests, that the unit fed with the diesel fuel generates noise on the level of 123 dB. Increase of the bio component’s share in the diesel fuel results in the drop of noise emission by approx. 2%. It results from the conducted studies, that the use of the fatty acids methyl esters’ additives to the diesel oil does not decrease the performance of the power unit and contributes to limitation of noise’s emission emitted by that engine.