HSD and polanga oil methyl ester (POME) fuel blends (20%, 40%, 60%, 80%, and 100%) were used for conducting the short-term engine performance tests at varying loads (0%, 20%, 40%, 60%, 80%, and 100%). All rights reserved.read more read lessĪbstract: Non-edible filtered high viscous (72 cSt at 40 ☌) and high acid value (44 mg KOH/gm) polanga (Calophyllum inophyllum L.) oil based mono esters (biodiesel) produced by triple stage transesterification process and blended with high speed diesel (HSD) were tested for their use as a substitute fuel of diesel in a single cylinder diesel engine. However, for higher blend concentrations, performance and emissions were observed to be marginally inferior. While operating the engine on Jatropha oil (preheated and blends), performance and emission parameters were found to be very close to mineral diesel for lower blend concentrations. The acquired data were analyzed for various parameters such as thermal efficiency, brake specific fuel consumption (BSFC), smoke opacity, CO2, CO and HC emissions. A single cylinder, four stroke, constant speed, water cooled, direct injection diesel engine typically used in agricultural sector was used for the experiments. Experiments were also conducted using various blends of Jatropha oil with mineral diesel to study the effect of reduced blend viscosity on emissions and performance of diesel engine. In the present research, experiments were designed to study the effect of reducing Jatropha oil's viscosity by increasing the fuel temperature (using waste heat of the exhaust gases) and thereby eliminating its effect on combustion and emission characteristics of the engine. However, several operational and durability problems of using straight vegetable oils in diesel engines reported in the literature, which are because of their higher viscosity and low volatility compared to mineral diesel fuel. Vegetable oils, due to their agricultural origin, are able to reduce net CO2 emissions to the atmosphere along with import substitution of petroleum products. Among various possible options, fuels derived from triglycerides (vegetable oils/animal fats) present promising "greener" substitutes for fossil fuels. This paper reviews recent RCCI experiments and computational studies performed on light- and heavy-duty engines, and compares results using conventional and alternative fuels (natural gas, ethanol, and biodiesel) with conventional diesel, advanced diesel and HCCI concepts.read more read lessĪbstract: The scarce and rapidly depleting conventional petroleum resources have promoted research for alternative fuels for internal combustion engines. In particular, a dual fuel engine combustion technology called “reactivity controlled compression ignition” (RCCI), which is a variant of Homogeneous Charge Compression Ignition (HCCI), is highlighted, since it provides more efficient control over the combustion process and has the capability to lower fuel use and pollutant emissions. This paper describes recent progress to improve the fuel efficiency of diesel or CI engines through advanced combustion and fuels research. The desire to increase IC engine fuel efficiency while simultaneously meeting emissions mandates has thus motivated considerable research. However, the relatively high emission of oxides of nitrogen (NOx) and particulate matter (PM) emitted by diesel engines increases their cost and raises environmental barriers that have prevented their widespread use in certain markets. This need for increased efficiency has placed compression ignition (CI) engines in the forefront compared to spark ignition (SI) engines. Rising fuel prices and stringent emission mandates have demanded cleaner combustion and increased fuel efficiency from the IC engine. The main objective is to highlight recent efforts to improve (IC) engine fuel efficiency and combustion. The energy density (measured in k W h / g \mathrm 0.01194 kWh/g.Abstract: This article covers key and representative developments in the area of high efficiency and clean internal combustion engines. Once you know this value, multiply it by the BSFC. To find this quantity, you need to consider the energy density of the fuel you feed to it. The BSFC is not a direct measure of the efficiency of the engine.
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