为确保柴油/甲醇双燃料燃烧 （Diesel/Methanol Compound Combustion，DMCC）发动机在稳定运行的前提下，突破爆震等因素的限制，进一步拓宽甲醇替代率边界，实现发动机性能的进一步提升。首先，在额定转速中高负荷下，分析了废气再循环(Exhaust Gas Recirculation, EGR)对DMCC发动机燃烧稳定性的影响。随后，基于仿真实验数据，建立用于预测燃烧稳定性参数的高斯过程回归（Gaussian Process Regression, GPR）模型。最后，以燃烧稳定性参数为限制条件，绘制拓宽后的甲醇替代率边界图。研究结果表明：EGR技术可显著提升高负荷下的燃烧稳定性，当EGR率从0%提升至20%，90%负荷下的最大压力升高率下降0.08MPa/°CA，爆发压力下降1.12 MPa，在80%～100%负荷区间内，甲醇替代率边界平均拓宽7.81%，特别是100%负荷下，从15.30%拓宽至20.02%。
To ensure stable operation of the diesel/methanol compound combustion (DMCC) engine, overcome limitations such as knocking, and further expand the methanol substitution boundary to achieve enhanced engine performance, this study was conducted. First, the impact of Exhaust Gas Recirculation (EGR) on the combustion stability of DMCC engines was analyzed under medium to high load conditions at rated speed. Then, based on simulation data, a Gaussian Process Regression (GPR) model was established to predict combustion stability parameters. Finally, the expanded methanol substitution rate boundary was mapped based on combustion stability parameters as constraints. The results show that EGR technology significantly improves combustion stability under high load. When the EGR rate is increased from 0% to 20%, the maximum pressure rise rate at 90% load decreases by 0.08 MPa/°CA, and the peak pressure drops by 1.12 MPa. Within the 80% to 100% load range, the methanol substitution rate boundary expands by an average of 7.81%, particularly at 100% load, where the substitution rate increases from 15.30% to 20.02%.
2025,47(21): 95-100 收稿日期：2025-1-21
DOI：10.3404/j.issn.1672-7649.2025.21.016
分类号：U664.121
基金项目：福建省自然科学基金资助项目（2022J01812）
作者简介：蒋更红(1976-),男,副教授,研究方向为船舶控制及轮机工程
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