Enhanced Performance and Emission Reduction in CI Engine using Octanol/Diesel Blend
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Abstract
Compression Ignition (CI) engine is one of the vital powertrains which are used for heavy-duty commercial purposes because of their better fuel economy and high torque reserve. However, the use of diesel increases several harmful pollutants such as unburnt hydrocarbons, carbon monoxide, smoke, etc. Thus, finding an alternative fuel is necessary as it decreases pollution and also diesel is a non-renewable resource. The main aim of this work is to study the influence of diesel-octanol blends on the performance and emission characteristics of a CI engine. Octanol fuel was mixed with diesel in various proportions to obtain five blends and named as D90OCT10, D80OCT20, D70OCT30, D60OCT40 and D50OCT50. These blends are tested on a 5.9 kW four-stroke, single-cylinder diesel engine and the obtained results are compared with a neat diesel fuel at all the loads. It can be seen that the diesel-octanol blends showed an increase in brake thermal efficiency (BTE) compared to a diesel fuel. The HC and CO emissions can be seen to be reduced, while the NOX and smoke emissions are found to be higher than the diesel. The blends like D80OCT20 and D70OCT30 showed better results than D90OCT10, D60OCT40 and D50OCT50 blends with BTE of 28.13% and 29.56% respectively. Upon analysing the emissions, NOX was found to be high for D80OCT20 and D70OCT30 blends. This is attributed to the high in-cylinder temperature and pressure generated during fuel combustion. The presence of oxygen in the octanol helped in achieving more complete combustion. Due to this, the diesel-octanol blends showed superior performance and lower emission than diesel.
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