为探究高压缩比甲醇发动机在稀薄燃烧条件下的性能和排放特性，文章选取一款经过改造的柴油机作为研究对象，搭建了相关一维和三维 CONVERGE 仿真模型。通过模拟发动机的实际工作过程，系统地分析了不同当量比、压缩比以及点火时刻对发动机燃烧效率和排放的影响。研究结果表明，相对于标准混合气燃烧，稀薄燃烧模式能够使用更少的甲醇燃料来满足发动机性能需求，在节约了燃料的同时减少了 CO2 排放。若在最佳点火时刻点火或增大压缩比，能够保持较低CO2 排放的同时，增大缸压可满足发动机动力性能，但会导致NOX排放升高。该研究为甲醇发动机的性能优化和排放控制提供了有价值的参考。
Simulation Study on Lean Combustion and Emissions of High Compression Ratio Methanol Engine
In order to investigate the performance and emission characteristics of high compression ratio methanol engines under lean combustion conditions,a modified diesel engine is selected as the research object,and the relevant one and three dimensional CONVERGE simulation model is built.The effects of different equivalent ratio,compression ratio and ignition time on combustion efficiency and emission of engine are systematically analyzed by simulating the actual working process of engine.The results show that compared with the standard mixture combustion,the lean combustion mode can use less methanol fuel to meet the performance requirements of the engine,save fuel and reduce CO2 emission.If ignition at the optimal ignition time or increase the compression ratio,it can maintain low CO2 emissions while increasing the cylinder pressure can meet the engine power performance,but it will lead to increased NOX emissions.This study provides a valuable reference for performance optimization and emission control of methanol engines.
万方数据
维普
