The influence of bio-fuels on the injection and combustion processes in a diesel cylinder

Abstract

Introduction (statement of the problem and relevance). The need for vehicles motor fuels is growing from year to year. Limited oil resources lead to the need to replace them with alternative ones. The necessity to find a solution of the problem is also encouraged by the current unfavorable environmental situation. The possibility of using alternative fuel resources in existing engines requires the study of their influence on various aspects of engine operation, including the process of fuel supply and combustion in the engine cylinder.The purpose of the current research was to obtain the characteristics of fuel supply and combustion in a diesel engine operating on methanol and methyl ester of rapeseed oil.Methodology and research methods. As an object of study, a tractor diesel engine with a dimension of 2Ч 10.5/12.0 air-cooled with volumetric mixing was chosen. The characteristics presented in the work were taken in the nominal mode at the crankshaft speed n = 1800 rpm and the average effective pressure in the cylinder pe = 0.588 MPa, as well as in the maximum torque mode n = 1400 rpm, pe = 0.594 MPa. Pilot fuel supply in all modes was constant and fixed. The fuel injection advance setting angles were also constant and amounted 34° of the crankshaft rotation to the top dead center for each of the fuels.Scientific novelty and results. The article considered the bench tests results of a diesel engine operating on methanol and rapeseed oil methyl ester in two characteristic modes. The indicators of fuel supply and combustion process in the diesel cylinder have been presented. The analysis of these indicators allowed determining the influence of the fuel supply process on the combustion characteristics in the engine.The practical significance lies in the possibility of using the obtained results to improve the operation of diesel engines on alternative renewable fuels.