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The influence of air side and fuel side water addition on engine's behaviour of a biofuel based CI engine under oxygen enriched combustion

ABSTRACT
The effect of water injection at the air side and water addition at fuel side on engine's performance of a diesel engine was studied under oxygen enriched intake air using NMO (Neat Mahua Oil) as fuel. Initially experiments were carried out using NMO as fuel with different oxygen concentrations such as 21% (ambient), 22.4%, 23.8 and 24.7% by volume at the air side. The optimal oxygen concentration was found based on the engine's BTE (brake thermal efficiency). At the optimal oxygen concentration water injection was done on air side at 4% by mass and the experiments were repeated with NMO as fuel under oxygen enrichment mode. Finally, MO emulsion was prepared using the same amount f water (i.e.4%) and tested in the engine. A comparative study was made for the same amount of water (i.e. 4% as optimal) for water injection and NMO emulsion on engines behaviour. Oxygen enrichment increased the BTE with all concentrations and reached the maximum value from 25.2% with ambient oxygen to a maximum of 30.6% at 23.8% of oxygen enrichment at the maximum BMEP of 5.4 bar whereas it was 30.8% with ND (neat diesel). The smoke, HC (hydrocarbon) and CO (carbon monoxide) emissions were significantly reduced with oxygen enrichment. However, oxygen enrichment increased the NO (nitric oxide) emissions at all concentrations. Injection of water and emulsification techniques reduced the NO emissions considerably. Emulsification showed more reduction in NO emission than WI for the same amount of water. It was concluded from the study that NMO could be effective used as fuel in compression ignition engines by combusting it under oxygen enriched condition. The optimal oxygen concentration of 23.8% could be recommended for the highest BTE. Injection of water at the intake manifold and emulsification techniques could solve the problem of higher NO emissions. The optimal amount of water that could be injected without affecting the engines power and BTE could be recommended as 4% by volume. Emulsification has the added advantage of further improvement in engine's BTE.
KEYWORDS
PAPER SUBMITTED: 2017-11-16
PAPER REVISED: 2018-09-09
PAPER ACCEPTED: 2019-01-28
PUBLISHED ONLINE: 2019-02-17
DOI REFERENCE: https://doi.org/10.2298/TSCI171116018M
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