甲醇因其高能量密度和低排放特性被应用于船用发动机，而甲醇掺水可以进一步降低排放。对1台8缸船用甲醇/柴油双燃料发动机上进行了推进特性试验研究，并建立了一维整机模型，通过对比试验和仿真数据验证了模型的准确性。基于模型研究了不同甲醇掺水量对发动机燃烧性能、经济性和排放性能的影响。结果表明，在不同负荷下，随着甲醇掺水量的增加，缸压和放热率降低，点火延迟滞后，燃烧持续期缩短，CA50在高负荷下提前，在低中负荷下滞后；等效油耗率增加，输出功率和热效率降低；NOx、HC和Soot排放减少，CO排放在低负荷下增加，在中高负荷下减少。该仿真结果为掺水甲醇在甲醇动力船舶上的应用提供了指导。
Methanol is used in marine engines for its high energy density and low emission characteristics, and methanol blending can further reduce emissions. The propulsion characteristics of an eight-cylinder marine methanol/diesel dual-fuel engine were investigated, and a one-dimensional model of the whole engine was established to verify the accuracy of the model through comparative tests and simulation data. Based on the model, the effects of different methanol water blending amounts on the combustion performance, economy, and emission performance of the engine were investigated. The results show that: at different loads, with the increase of methanol water doping, the cylinder pressure and heat release rate decrease; the ignition delay lags; the combustion duration shortens; the CA50 advances at high loads and lags at low and medium loads; the equivalent fuel consumption rate increases; the output power and thermal efficiency decrease; the NOx, HC, and Soot emissions decrease; and the CO emission increases at low loads and decreases at medium and high loads. The simulation results provide guidance for the application of water-doped methanol to methanol-powered vessels.
2025,47(12): 72-77 收稿日期：2024-7-11
DOI：10.3404/j.issn.1672-7649.2025.12.014
分类号：(TK46+4)
基金项目：黑龙江省自然科学基金—联合引导项目（3072024XX2721）；高技术船舶科研项目（KY10300190077）
作者简介：刘真余(2000-),男,硕士研究生,研究方向为新型动力与新能源
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