Abstract
The paper presents the experimental test results of a common rail injection system operating with biodiesel and the diesel fuel. The three fuel split injection strategies were implemented to investigate the effects made by biodiesel and a fossil diesel fuel on the history of injector inlet pressure and the injection rate. In addition, the three intervals between split injections and the different injection pressures were used to obtain more information about the studied subjects. The obtained results showed that the peak mass injection rates of the main injection phase were slightly higher when using biodiesel than the respective values measured with the normal diesel fuel. Because the first injection phase activated the fuel pressure fluctuations along the high-pressure line and in front of the injector, the time-span between injections has an impact on the injector inlet pressure and thus the fuel injection rate during the second injection phase. Since the nozzle closes little later for biodiesel, the injector inlet pressure also occurred latter in the cycle.
Highlights
Fuel split injection characteristics play a significant role in the fuel spray development [1, 2], the fuel-air mixture stratification [3], as well as the ignition delay and the subsequent combustion process [4, 5] characteristics of the diesel engine.Han et al [6] experimentally investigated the split injection process of fatty acid esters on a common rail injection system
The three fuel split injection strategies were implemented to investigate the effects made by biodiesel and a fossil diesel fuel on the history of injector inlet pressure and the injection rate
The obtained results showed that the peak mass injection rates of the main injection phase were slightly higher when using biodiesel than the respective values measured with the normal diesel fuel
Summary
Han et al [6] experimentally investigated the split injection process of fatty acid esters on a common rail injection system. The test results show that the fuel properties caused modest changes in the pressure fluctuation after the end of injection as well in the injection mass. Han et al [7] carried out numerical study on fuel physical properties made effects on the split injection processes of a common rail injection system. In that study a one-dimensional model based on AVL HYDSIM was established to identify the effect of fuel density, viscosity and bulk modulus of compressibility on split injection characteristics. Researchers found that fuel physical properties effects were modest at the pilot injection stage, but more noticeable at the main injection stage
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