Optical Research on the Fuel Injection Into a Diesel Engine for Diesel Fuel, Rme and Rape Oil

Abstract

The paper presents the results of the research on the influence of diesel fuel, rape oil methyl esters and rape oil on the evolution of the jet, velocity of the jet front and the atomization/spraying apex angle versus the crank angle of the engine. Measuring was performed using a single-cylinder Diesel engine with direct fuel injection and the apparatus AVL Engine VideoScope. It was found that physical and chemical parameters diversifying the tested fuels significantly influence the parameters of the sprayed fuel jet. It applied mainly to the increase of the fuel atomization apex angle for the fuels of high viscosity as compared with diesel fuel and to different course of the range and velocity of the jet front versus the engine crank angle. Large and heavy drops of vegetable oil have initially higher velocity than for diesel fuel. However, very soon, the velocity of rape oil jet front decreases to a lower value than for the petroleum fuel. From the visualisation process we can observed real start of injection and combustion processes. From these measure-delay of self-combustion in diesel engine. Delay of self-combustion for natural rapeseed oil is shorter than for standard diesel fuel. As a result of this fact, we can observe in next research lower combustion dynamic, lower max. combustion temperature and lower concentration of NOx in exhaust gases. A change of the organization of the injection process of tested fuels can bring on differences in the combustion course.

Visualisation and Thermovision of Fuel Combustion Affecting Heat Release to Reduce NOx and PM Diesel Engine Emissions

“…where τ R and τ G represent the specific filter transmittance for red light and green light, respectively. A detailed derivation of Equations ( 1) and ( 2) was presented in our previous studies [41][42][43][44] and in other studies in the literature [45][46][47][48].…”

Comparison of Indicator and Heat Release Graphs for Vw 1.9 Tdi Engine Supplied Diesel Fuel and Rapeseed Methyl Esters (Rme)

“…a Schenck W150 electrical brake -control and measurements of engine torque, an AVL Fuel Balance mass fuel meter -measurements of fuel consumption, an AVL CEB II measuring system -measurements of gaseous components of exhaust gases (CO, CO2, NO, NOx, THC, O2), an AVL Smoke Meter 401 -measurements of soot concentrations in exhaust gases using the Bosch method, a measuring system with a tunnel used to dilute exhaust gas -measurements of particulate matter (PM), an AVL Indimeter 617D measuring system -measurements of rapidly changing pressure values of the working medium and pressure values of the fuel in the injection system and the movements of the injector needle, an AVL VideoScope 513D measuring system -used to visualize the fuel injection and combustion processes in the engine cylinder, to determine the flame propagation probability and the distribution of isotherms in the flame. A test bed equipped as above certainly facilitates a wider scope of tests [1,3,4], but it is not the aim of this to discuss visualizations of the fuel injection and combustion processes in an engine cylinder or thermal imaging. Particular attention is paid to the measured indicator diagrams and the resultant calculated curves of heat release rates and combustion temperatures (as a function of CAD) for the tested fuel types (ON and RME).…”