Akademik Veri Yönetim Sistemi
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, 2024 (SCI-Expanded)
The HCCI combustion mode has the critical advantages of avoiding locally rich mixtures, reducing gas temperatures, and minimizing NOx and PM emissions. However, these advantages come with problems, such as knock risk, difficulty starting combustion, control of the combustion phase, and limited operating range. In order to eliminate these problems, engine operating conditions, and fuel properties must be controlled simultaneously. For this purpose, a numerical model created using Converge CFD software has been validated with experiments. In the combustion analysis, oxygen-containing alcohol derivatives (methanol, ethanol, and butanol) were used as low-reactivity fuels, and n-heptane was used as a high-reactivity fuel. According to the results, fuels containing 10% alcohol caused knocking at high loads, while optimum operating conditions were obtained with increasing alcohol content. When B10, E10, and M10 fuels were analyzed, the highest pressure was recorded as 4.04 MPa for E10 fuel under common operating conditions with an equivalence ratio of 0.45. With increasing alcohol content, CA50 shifted to after TDC, and ITE increased. The highest ITE of 40.22% was obtained at an equivalence ratio of 0.35 using E20 fuel. Under similar operating conditions, the ITE values for B20 and M20 fuels were found to be 37.26 and 34.08%, respectively. It was observed that the MPRR decreased with increasing alcohol content and leaner mixture. The lowest average MPRR was obtained with M20 fuel. It was found that using alcohol-derived mixture fuels in HCCI combustion mode in low compression ratio engines positively affects engine performance.