Abstract
• Thevetia peruviana is a renewable fuel. • Brake thermal efficiency increases as the load increases. • RCCI is one of the most efficient low temperature combustion strategy. • RCCI engine powered with CNG exhibits higher BTE. In the present work, an effort is carried out to study the effect of load extension in reactivity controlled compression ignition (RCCI) mode of combustion. Compressed natural gas (CNG) and compressed biogas (CBG) are used as low reactivity fuels. Diesel and different blends of thevetia peruviana methyl ester (TPME) are used as high reactivity fuels. The whole experimentation is carried out at 50% and 75% of the rated power. Results showed that RCCI engine operated at 75% load gives higher brake thermal efficiency (BTE) about 29.74% and higher nitric oxide (NOx) emissions along with lower carbon monoxide (CO), hydrocarbon (HC) and smoke emissions. Among various fuel combinations tested D + CNG gives better results in terms of performance and emission characteristics.
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