Advanced Combustion Engine Technologies
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Abstract
Abstract
To address the combustion optimization of methanol-hydrogen dual-fuel engines, this study established a three-dimensional numerical model of methanol port fuel injection (PFI) and high-pressure hydrogen direct injection (HDI), combined with Taguchi orthogonal experimental design, to systematically investigate the effects of nozzle number, injection angle, and length-to-diameter ratio (L/D) on combustion characteristics. Results indicate that the nozzle number is the dominant factor, with a contribution rate of 89.2% to the indicated mean effective pressure (IMEP). Increasing the number of nozzles to six can significantly improve the in-cylinder hydrogen distribution, achieving an indicated thermal efficiency (ITE) of 45.77%. Optimizing the injection angle to 40° facilitates the formation of an ideal mixture distribution and promotes the combustion process; while a moderate length-to-diameter ratio (L/D = 2) can achieve an optimal balance between flow resistance and turbulent kinetic energy. Parameter optimization based on the Taguchi method determined that the optimal combination for improving IMEP is six nozzles, 40° injection angle, and L/D = 2. This study reveals the critical role of nozzle structural parameters in mixture formation, providing a theoretical basis for the nozzle design of dual-fuel engines.
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@article{Luan2026Effects,
title = {Effects of hydrogen nozzle structural parameters on combustion characteristics in a methanol-hydrogen blended-fuel engine},
author = {Xianzheng Luan and Yituan He},
journal = {International Journal of Engine Research},
year = {2026},
doi = {10.1177/14680874261470498},
url = {https://doi.org/10.1177/14680874261470498}
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