为解决船用柴油机NOX，soot，CO等过高排放的问题，以实验室4190ZLC-2型船用中速机为研究对象，运用AVL-FIRE软件构建燃烧室模型，并验证模型的准确性。通过采用仿真实验，研究不同甲醇掺混比对柴油机燃烧及排放特性的影响，在保证柴油机正常燃烧性能情况下，得出最佳的甲醇掺混比。研究结果表明：与纯柴油相比，甲醇-柴油混合燃料使得缸内最大爆发压力有所降低，对应相位略有提前；放热率曲线呈单峰分布且峰值增加，相对曲轴转角滞后；额定工况下随着甲醇的掺混比例增加，CO排放显著增加，NOX，soot排放量呈降低趋势。经分析，在掺混比为20%，NO排放较原机降低5.4%，CO含量增加49.2%，soot排放量降低71.2%。
In order to solve the problem of excessive emissions of NOX, soot, and CO of marine diesel engines, this research takes laboratory 4190ZLC-2 marine medium-speed engine as the research object, and uses AVL-FIRE software to build a combustion chamber model, and verifies the accuracy of the model. Through the use of simulation experiments, the effects of different methanol blending ratios on the combustion and emission characteristics of diesel engines are studied, and the optimal methanol blending ratio is obtained while ensuring the normal combustion performance of diesel engines. The research results show that compared with pure diesel, the methanol-diesel hybrid fuel reduces the maximum burst pressure in the cylinder, and the corresponding phase is slightly advanced; the heat release rate curve has a unimodal distribution and the peak value increases, and the relative crank angle is lagging; In this case, as the blending ratio of methanol increases, CO emissions increase significantly, and NOX and soot emissions decrease. After analysis, at a blending ratio of 20%, NO emissions are reduced by 5.4% compared to the original machine, CO content is increased by 49.2%, and soot emissions are reduced by 71.2%.
2020,42(11): 101-104,109 收稿日期：2020-04-16
DOI：10.3404/j.issn.1672-7649.2020.11.020
分类号：U664.121
基金项目：福建省自然科学基金资助项目(2017J01486，2018J01499，2019J01706，2020J01690)
作者简介：宣熔(1996-)，男，硕士研究生，研究方向为双燃料发动机性能优化及排气测试分析
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