Abstract:

Reactivity-controlled compression ignition (RCCI) engine is an innovative method with high efficiency and low emissions. In the RCCI engine, unlike other types of internal combustion engine (ICE), the combustion can be controlled with fuels of different reactivity degrees injected both into the intake and into the cylinder. In this study, the potential of biogas as a renewable resource to be used as a fuel in an RCCI engine was investigated. The effects of biogas injection into the intake as a low-reactivity fuel were evaluated. An experimentally validated quasi-dimensional modeling of a biogas-fueled RCCI engine has been carried out. The test engine fueled with biogas was investigated for different operating parameters, thus, the optimal parameters were determined. The influence of biogas on combustion and engine performance characteristics according to lambda, engine speed, compression ratio, intake pressure, and valve timings were investigated. As a result of the studies, optimum values were determined using the quasi-dimensional (QD) engine model and NSGA-II method. With these optimum values, it has been determined that the RCCI engine can operate with minimum specific fuel consumption (SFC) and maximum efficiency.

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