In this paper the effects of an experimental bioethanol fumigation
application using an experimental ultrasound device on performance and
emissions of a single cylinder diesel engine have been experimentally
investigated. Engine performance and pollutant emissions variations were
considered for three different types of fuels (biodiesel,
biodiesel-bioethanol blend and biodiesel and fumigated bioethanol).
Reductions in brake specific fuel consumption and NOx pollutant emissions are
correlated with the use of ultrasonic fumigation of bioethanol fuel,
comparative to use of biodiesel-bioethanol blend. Considering the fuel
consumption as diesel engine?s main performance parameter, the proposed
bioethanol?s fumigation method, offers the possibility to use more efficient
renewable biofuels (bioethanol), with immediate effects on environmental
protection.
The main objective of the paper is to present the results of the CFD simulation of a DI single cylinder engine using diesel, biodiesel, or different mixture proportions of diesel and biodiesel and compare the results to a test bed measurement in the same functioning point. The engine used for verifying the results of the simulation is a single cylinder research engine from AVL with an open ECU, so that the injection timings and quantities can be controlled and analyzed. In Romania, until the year 2020 all the fuel stations are obliged to have mixtures of at least 10% biodiesel in diesel [14]. The main advantages using mixtures of biofuels in diesel are: the fact that biodiesel is not harmful to the environment; in order to use biodiesel in your engine no modifications are required; the price of biodiesel is smaller than diesel and also if we compare biodiesel production to the classic petroleum based diesel production, it is more energy efficient; biodiesel assures more lubrication to the engine so the life of the engine is increased; biodiesel is a sustainable fuel; using biodiesel helps maintain the environment and it keeps the people more healthy [1-3]
The purpose of this study is to investigate the theoretical possibility of using a pilot diesel injection for the auto-ignition of a main ethanol injection in a compression ignition engine. To this effect a predictive simulation model has been built based on experimental results for a diesel cycle (pilot and main injection) at 1500 and 2500 min?1, respectively. For every engine speed, in addition to the diesel reference cycle, two more simulations were done: one with the same amount of fuel injected into the cylinder and one with the same amount of energy, which required an increase in the quantity of ethanol proportional to the ratio of its lower heating value and that of diesel. The simulations showed that in all cases the pilot diesel led to the auto-ignition of ethanol. The analysis of the in-cylinder traces at 1500 min?1 showed that combustion efficiency is improved, the peak temperature value decrease with approximately 240 K and, as a result, the NO emissions are 3.5-4 times lower. The CO and CO2 values depend on the amount of fuel injected into the cylinder. At 2500 min?1 there are similar trends but with the following observations: the ignition delay increases, while the pressure and temperature are lower.
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