Experimental Investigations On The Impact Of Addition Of Different High Octane Fuels On Engine’s Behavior of a Mahua Oil Based Diesel Engine

Paper #:
  • 2018-01-0911

Published:
  • 2018-04-03
Abstract:
This work aims at investigating the engine’s performance, emission and combustion behavior of different high octane fuels blended with MO (Mahua oil) as fuel. Mahua oil (MO) - a non edible vegetable oil was chosen as base fuel for the work due to its availability (particularly in south India) and properties such as cetane number, calorific value, density, self ignition temperature are very close to diesel values. Ethanol, methanol and eucalyptus oil were selected as low viscous (high octane) fuels for belnding with MO. A single cylinder, water cooled, direct injection diesel engine was used. In the first phase, different blends were prepared using MO as base fuel with eucalyptus oil, ethanol and methanol. The optimum blends were found based on the stability as 30EO70MO (30% eucalyptus oil and 70% MO), 25ETH75MO (25% ethanol + 75% MO) and 15METH85MO (15% methanol + 85 MO) by mass. In the second phase of work, experiments were conducted on the engine at the rated speed of 1500 rev/min at variable loading (power output) conditions using neat diesel (ND), neat MO and the optimal blends of eucalyptus oil, ethanol and methanol with MO as fuels. A detailed comparative study was carried out on the engines performance, emission and combustion characteristics on all the optimal blends as fuels. Results indicated reduced BTE and increased emissions of smoke, HC (hydrocarbon) and CO (carbon monoxide) with neat MO as fuel at all loading conditions. Reduced peak pressure, increased ignition delay and inferior heat release rates were noted with neat MO as fuel as compared to ND. However, all the tested blends showed improvement in BTE, reduction in smoke and NO (Nitric Oxide) emissions at all power outputs. The BTE increased from 25.2% with neat MO to a maximum of 29%, 26.4% and 28.3% respectively with the blends of 30EO70MO, 15METH85MO and 25ETH75MO at the maximum power output of 3.7 kW whereas the maximum BTE was noted as 30.8% with ND. Considerable reduction in smoke emission was noted for all the blends of eucalyptus oil, ethanol and methanol with MO at all power outputs. The values were noted to be 52%, 54% and 68% respectively with 30EO70MO, 25ETH75MO and 15METH85MO at the maximum power output whereas the smoke was 78% and 51% with neat MO and ND respectively. The reduction in smoke emission and improvement in BTE with all the blends were explained by the improvement in the atomisation process as a result of reduced viscosity of all the blends. All the blends increased the peak pressure and the rate of pressure rise considerably. The ignition delay of the blends was noted to be higher at all power outputs as compared to neat MO. The values were notes as 13oCA, 14oCA and 15oCA respectively with 30EO70MO, 15METH85MO and 25ETH75MO at the maximum power output where as it was noted as 12oCA and 10oCA with neat MO and ND respectively. The combustion duration was shortened with all the blends and the heat release rate was noted to be superior to neat MO. Among the blends tested 30EO70MO showed the best performance in terms of highest brake thermal efficiency, lowest smoke, HC and CO emissions. It is concluded that MO could be used as fuel in the blended form with eucalyptus oil, methanol and ethanol in the unmodified engine with superior thermal efficiencies and reduced smoke emissions. Methanol and ethanol addition could be helpful in reducing NO emissions as well. However the increase in HC emission needs attention. If the aim is to replace more MO with better stability and achieve highest thermal efficiency, lowest smoke levels then eucalyptus oil could be preferred. Keywords: Eucalyptus oil, Ethanol, Methanol, Mahua Oil, Blending, Engine performance, Emissions, Combustion
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