Performance and emission characteristics of CI engine, fuelled with diesel and oxygenated fuel blends

Abstract

Vegetable oils are a potential alternative towards partial or total substitution of diesel fuels. In this study, we used ethanol as the solvent, and a bio fuel enhancer as additive to explore the possible use of higher percentages of biodiesel in an unmodified diesel engine. Biodiesel was produced from cashew nut shell liquid (CNSL) by pyrolysis process. A mixture containing 80% (by volume) of Number 2 diesel fuel and 20% (by volume) of biodiesel is called here as B20. The effect of 10% ethanol, (by volume) blended with B20 was studied in a single cylinder, four strokes direct injection diesel engine after adding a bio fuel enhancer as additive. The impact of test fuels on engine torque, power, brake specific fuel consumption, brake thermal efficiency, and exhaust gas temperature were investigated by the performance tests. The influence of blends on CO, CO 2 , HC, NO and smoke opacity were measured by emission tests. The experimental results showed that when a fuel mixture containing 10% ethanol, B20 and a bio fuel enhancer as additive was used, the exhaust emissions were fairly reduced; especially the NO is reduced remarkably by 30% when compared to using B20 alone. Smoke opacity was reduced by 20% when compared to using diesel alone.Reference to this paper should be made as follows: Pushparaj, T., Ramabalan, S. and Selvan, V.A.M. (2015) 'Performance and emission characteristics of CI engine, fuelled with diesel and oxygenated fuel blends', Int.

The performance of a developed diesel vehicle to run on WCO biodiesel at variable speeds and loads

“…Fossil diesel has a greater air -fuel ratio than methyl ester (Ramesh et al 2008). A richer air-fuel combination is required at greater output power, as evidenced by the fact that all studied biodiesel mixtures exhibit a decline in the air-fuel ratio (Elango and Senthilkumar 2011;Pushparaj et al 2015;Qenawy et al 2024). Compared to crude diesel, methyl ester mixtures have lower volumetric efficiency because of the higher EGT which heats the entering air (Pushparaj et al 2015).…”

“…A richer air-fuel combination is required at greater output power, as evidenced by the fact that all studied biodiesel mixtures exhibit a decline in the air-fuel ratio (Elango and Senthilkumar 2011;Pushparaj et al 2015;Qenawy et al 2024). Compared to crude diesel, methyl ester mixtures have lower volumetric efficiency because of the higher EGT which heats the entering air (Pushparaj et al 2015). The vaporization of pure diesel improves the volumetric efficiency, lowers exhaust gas temperature, and increases air density (Chalatlon et al 2011;Vajja and Murali 2016).…”

Performance and emissions of a diesel engine burning blends of Jatropha and waste cooking oil biodiesel

“…All tested diesel-biodiesel blends show a decreasing air-fuel ratio with increasing engine brake power, manifesting that a richer air- fuel mixture is needed at higher loads. 20,21 Jatropha biodiesel and its mixtures with diesel oil have lower volumetric efficiencies more than crude diesel. This is because the retained exhaust gases have a higher temperature which warm the incoming air and reduce the volumetric efficiency.…”

Shock tube studies on ignition delay and combustion characteristics of oxygenated fuels under high temperature

“…At present, the research of using oxygenated fuel in the engine shows that the diesel blended with oxygenate can significantly reduce the emissions of engine. [10][11][12][13][14] However, with the development of the research, the researchers found that although the oxygenated fuel can improve the in-cylinder combustion process of engine and reduce particulate matter (PM) emissions, the NO x , HC, CO and CO 2 emissions still depend on engine operating condition and the composition of oxygenated fuel. [15][16][17] The combustion in-cylinder of diesel engine is a complex turbulent premixed and diffused combustion process, and the experimental results are affected by many factors.…”