Influence of quaternary combinations of biodiesel/methanol/n-octanol/diethyl ether from waste cooking oil on combustion, emission, and stability aspects of a diesel engine

Potential of bio-ethanol in different advanced combustion modes for hybrid passenger vehicles

This study aims to analyze the effects of a novel ternary blend of n-butanol and castor oil methyl ester (COME) with petro-diesel on combustion, engine performance and emission characteristics of four stroke single cylinder diesel engine and to obtain optimum blending proportion which can simultaneously reduce UHC, CO, and NOx without affecting engine performance. A quick and simple approach involving a single zone combustion model coupled with double and triple Wiebe functions has been successfully applied to analyze combustion behavior of binary and ternary fuel blends respectively. Neat diesel was used as a baseline fuel to compare combustion, performance and emission characteristics with binary and ternary fuel blends (B30, B20Bu10, B10Bu20 and B15Bu15). Apparent heat release rate (AHRR) calculated from the model is in good agreement (RMSE ≤ 1.33) with experimental values. Peak AHRR values (J/°CA) for fuel blends B30, B20Bu10, B15Bu15, B10Bu20 and neat diesel were found to be 26.1, 29.4, 32.7, 37.1, and 36.1 respectively. The ignition delay period was not affected for B30 blend however it was observed to be increased by 2.89–3.35°CA for n-butanol blended fuels. Results of B30 fuel blend showed reduction in BTE by 1–3% with increase in greenhouse gas emissions. The results of ternary fuel blend (B15Bu15) showed improvement in engine performance characteristics whereas NOx emission was reduced in the range of 20–60% compared to B30. Detrimental effect on engine performance, emission characteristics and combustion behavior was observed for B10Bu20. Therefore, B15Bu15 was considered as an optimum fuel blend.

Combustion investigation of ternary blend mixture of biodiesel/n-butanol/diesel: CI engine performance and emission control

The present experimental investigation is conducted to examine the working characteristics of compression ignition (CI) engine using oxygenated additives such as diethyl ether and ethanol to the blends of Calophyllum inophyllum biodiesel. Experiments are conducted on a water-cooled single-cylinder constant speed DI (direct injection) diesel engine under same operating circumstances. The results indicates that an enhancement of brake thermal efficiency is up to 3.7% and 6.2% with an addition of ethanol and DEE additive in biodiesel blended fuels respectively at maximum load condition. This is attributable to the existence of higher oxygen value and volatile nature of the additives. The combustion characteristics like in-cylinder pressure and net heat release rate of DEE blended fuels are 1.1-5.2% and 0.4-2.7% higher than other blends respectively. This is mainly due to higher cetane number and high volatile nature of DEE. This also results in higher NOX emissions. But 2-9% drop in nitrous oxide emission is noticed for biodiesel with ethanol blends compared to all other blends. This is as a result of superior latent heat of vaporization and lesser cetane number of ethanol which results in lower cylinder pressure about 0.4-2.6% and this end up with more unburned HC and CO emissions. Energy and exergy studies help to analyze the result of ethanol and DEE additive along with blends of biodiesel. The exergy efficiencies of DEE blended fuels enhance up to 2.3-6% compared to other blends at all load conditions. This is attributable to the superior combustion characteristics of DEE.

Effect of diethyl ether and ethanol as an oxygenated additive on Calophyllum inophyllum biodiesel in CI engine.

Many researchers delve for an alternative fuel to overcome the fossil fuel crisis. Developed countries have embarked focus on renewable energy like wind energy, geothermal, biofuel, ocean energy and solar energy. Biodiesel is considered to be one of the most felicitous one kinds of renewable energy with similar properties of diesel fuel. Biodiesel is gaining prominence due to the global fossil fuel crisis and emission control challenges. Biodiesel blends are formulated in numerous proportion with diesel to run the diesel engine and it has significantly reduced the harmful pollutants from contaminating the environment. This review paper summarizes the outcome of biodiesel blends on properties, performance and emission-quality of a diesel engine under different operating conditions. Results from the literature provide a comparative data between conventional diesel and diesel-biodiesel blend which indicates that the diesel-biodiesel blend provides shorter ignition delay and lesser heat release rate as well as slightly higher efficiency. The emissions like CO, HC and particulate matter are reduced while choosing biodiesel blends. Biodiesel blend with additives such as alcohol can be the appropriate solution for the fuel crisis. Finally, the review concludes the advantages and future scope of biodiesel as a better competent for diesel fuel.

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Senthil Kumar Kandasamy

Papers

Experimental investigations of ethanol blended biodiesel fuel on automotive diesel engine performance, emission and durability characteristics