Abstract
ABSTRACT Depleting petroleum-based liquid fuel reserves has driven researchers to find alternative fuels to meet vehicles and the industry’s energy demands. Methyl esters produced from vegetable oils are commonly used as fuel for compression ignition engines. The present work’s objective is to investigate the performance, combustion, and emission characteristics of rubber seed oil methyl ester blends with and without isopropyl alcohol as an additive on a variable compression ratio engine. The blends B10, B20, and B30 and rubber seed oil were compared with diesel for the compression ratios of 12:1, 16:1, and 20:1. The same blends were experimented with by adding isopropyl alcohol 5% by volume. The brake thermal efficiency results, specific fuel consumption and emissions, indicated that B10 and B20 with additives have better results than diesel and rubber seed oil. The brake thermal efficiency of B10 with 5% isopropyl alcohol is 3.14% higher than diesel. The addition of isopropyl alcohol with rubber seed oil methyl ester has reduced the carbon monoxide, hydrocarbon, and smoke emission to a maximum of 10.8%, 33%, and 32.2%, respectively. Averaged cylinder pressure, heat release rate under varying compression ratios have also conversed in this paper.
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