Emulsified Diesel fuels by 5, 10 and 15% water/Diesel ratios by volume, were utilized in a 6 cylinder, direct injection Diesel engine. Fuel usage of the emulsion systems was more than that of diesel, but the tiny droplets of water improved diesel combustion. Compared with diesel, a reduction in carbon monoxide (CO) and nitrogen oxide (NOx) emissions and a slight reduction in HC was observed for emolsified fuel. The existance of water particles and additives in the fuel decreased the heating value of the fuel, and despite the improvement of combustion as a result of microexplosion phenomena, was made a loss of engine power.
Keywords: diesel engine, water emulsified diesel, emission, fuel
Diesel engines have been utilized in heavy duty vehicles for a ahead of time; it's just in the past decade that it has become popular in light duty application for their higher fuel efficiency. Higher fuel efficiency in the diesel engine is obtained as a result of high compression ratios along with high air concentration in the combustion chamber. Nevertheless, these same factors results in large NOx emission in diesel engine. The stringent emission norms have been a significant driving force to enlarge the internal combustion engines more environment friendly. The important emissions from diesel engin...
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...gital flowmeter was used. This flowmeter was placed in the fuel flow path and fuel back path to the other tank redirected. Emission analyzer made by Germany was used for measuring the outflow pollutants from the exhaust that having a measurement capability of O2, HC, NOx, CO, CO2 and represents the oil temperature. The water-in-diesel emulsions consisting of Diesel fuel and ordinary tap water, were prepared in an ultrasonic vibrator. To stabilize the emulsions, a 2% by volume surfactant mixture consisting of Span 80 and Tween 80 was used. Four blends were tested: pure Diesel and Diesel fuel with surfactant and 5%, 10% and 15% water by volume. The prepared emulsion fuel is a milky white liquid that is observed in Fig 6. For each run the engine was started on pure Diesel and then switched to the test blend. A schematic picture of experimental set-up is given in Fig 7.
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