Experimental investigation on impact of water in diesel emulsion in a single-cylinder research diesel engine

Abstract

The current study focuses on assessing the impact of water-emulsified fuel on single-cylinder diesel engine. The effect of water concentration, homogeniser speed and surfactant concentration on the stability of water in diesel emulsion is studied. The performance, emission, and combustion analysis have been carried out by varying compression ratio, injection timing, and injection pressure. It is noted from stability analysis that for 10% water at 15,000 RPM homogeniser speed, 1% surfactant mixture is the optimal parameter to achieve stability of WD emulsion. Ignition delay period and combustion duration increase as water concentration is increased in the emulsion. At a compression ratio of 18, injection timing 23bTDC and pressure 210 bar show reduced carbon monoxide, hydrocarbon, oxides of nitrogen, and smoke emission by 8.3%, 8.57%, 21.25%, and 43.07%, respectively, compared to standard diesel. The injection pressure of 250 bar shows enhanced brake thermal efficiency compared to 210 and 230 bar.