Abstract
The article presents results of the studies on the charged, dual-fuel CI compression ignition engine fuelled with propane. The main goal of the studies was to fuel the engine so that the amount of energy provided with propane is possibly highest at the high efficiency, low emission of harmful exhaust constituents and proper combustion. As the studies conducted so far have shown, with the increase of energy from propane we observe crucial changes in the combustion process. As these changes may be a barrier in the further increase of energy, we decided to change the injection parameters of the diesel fuel. The changes introduced allowed for the 70% energetic contribution of gas fuel at the subsequent elimination of unfavourable phenomena. The fuel injection was realized divided into two doses. Both proportions and angle at the beginning of the injection for both doses were variable. The angle at the beginning of injection for the first dose was changed in a wide range and depended on the value of charging pressure. The angle at the beginning of injection for the second dose was changed in a much narrower range, mainly due to very clear changes in the nature of combustion process. The studies have been conducted for three values of charging pressure, namely 200; 400 and 600 [mbar], and also for the naturally aspirated version. Study results have been presented in a form of regulation characteristics for the angle of the beginning of injection of the pilot dose for the chosen charging variants, as well as volume and angle of the beginning of injection for the main dose. The obtained results show that the content of exhaust constituents for the dual-fuel CI engine depends highly on assumed regulations of injection parameters of the fuel dose initiating the ignition, as well as engine charging pressure.
Highlights
As numerous publications both domestic and foreign show, the idea of dual-fuel CI engine fuelling is attractive and keeps being developed [3]
The basic parameters of combustion process, and the same, exhaust constituents of the engine fuelled in this way highly depend on the content of this mixture
The results presented above allow to formulate the following conclusions: a) with the increase of QI diesel fuel pilot dose value the concentration of particulate matter (PM) increases, b) with the increase of charging pressure the concentration of PM increases, c) adjustment of injection advance angle of the QI dose causes the changes in PM concentration; the more delayed the injection angle of the QII, the greater the changes of PM concentration, d) for the charged engine the delay of angle of the beginning of injection for QII dose is accompanied by the increase in PM concentration
Summary
As numerous publications both domestic and foreign show, the idea of dual-fuel CI engine fuelling is attractive and keeps being developed [3]. What makes this fuelling type so attractive is the possibility of using cheaper fuels, available in the market These may be both renewable fuels and those coming from crude oil refining, for instance mixture of propane and butane (LPG). In order to achieve this goal we used the possibilities of modern supply system of common rail type As these and further studies have shown, the way of releasing energy from propane greatly depends on the strategy of parameters selection for diesel fuel injection. It is crucial if an ignition-initiating dose is injected once or it is divided into pilot and main dose. The registration of exhaust composition and pressure inside the cylinder allowed for the analysis of the influence of diesel fuel injection parameters on the combustion process in the engine fuelled in this way
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