Experimental study on the performance and emission properties of variable compression ratio engine at different compression ratios

Abstract

This study experiments on a single-cylinder, four-stroke, variable compression ratio diesel engine by comparing the performance and emission properties of diesel and linseed biodiesel blends. The biodiesel blends were obtained using a volume basis of 10%,20%,30%, and 40% of the linseed biodiesel blends, respectively, for experimentation. The linseed biodiesel blends are compared to identify the optimum biodiesel blend under changing compression ratios from 13.5:1 to 16.5:1 with a speed of 1500 rpm. The outcomes show that a combination of 20% linseed biodiesel with 80% diesel gives maximum performance compared to all other blends. The blends exhibited increased mechanical efficiency and brake power. Blends LD10 to LD40 demonstrated 2.6% more excellent mechanical efficiency and 13.4% higher brake power than diesel at a 16.5:1 compression ratio. For the blends LD10 to LD40, the exhaust gas temperature was 54.7℃ lower than diesel. In addition, hydrocarbon and carbon monoxide emissions were reduced by 47% in the maximum blend percentage, and compared to diesel emissions, carbon dioxide emissions were 38.3% greater.