| 宋志辉,何建祥,张志敏,等.面向商用车动力的甲醇发动机热效率提升路径与工程实践[J].内燃机工程,2025,46(5):52-61. |
| 面向商用车动力的甲醇发动机热效率提升路径与工程实践 |
| Path and Engineering Practice of Improving Thermal Efficiencies of Methanol Engines for Commercial Vehicle Power |
| DOI:10.13949/j.cnki.nrjgc.2025.05.006 |
| 关键词:甲醇 发动机 热效率 重型商用车 |
| Key Words:methanol engine thermal efficiency heavy commercial vehicle |
| 基金项目: |
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| 摘要:针对采用ω燃烧室的重型商用车点燃式甲醇发动机热效率偏低的问题,基于某13 L甲醇发动机开展优化研究。将原ω燃烧室重新设计为屋脊型结构,将螺旋涡流气道改为高滚流气道,并对活塞顶进行适应性调整;同时根据甲醇特性重新设计了凸轮型线、冷却水套、进排气系统,并匹配了专用增压器。采用CAE分析工具对设计方案进行验证。结果表明:优化后发动机有效热效率由42.0%提升至50.2%,提升了8.2个百分点,相对提升率达19.5%。 |
| Abstract:To address the low thermal efficiency of a heavy-duty spark-ignition methanol engine with an ω-type combustion chamber, an optimization study was conducted based on a 13 L methanol engine. The combustion system was redesigned by replacing the ω-type chamber with a pent-roof configuration, converting the helical swirl intake port to a high-tumble flow design, and modifying the piston crown accordingly. Additional enhancements included redesigning the cam profile, cooling water jacket, intake/exhaust systems, and matching a dedicated turbocharger based on methanol fuel characteristics. The optimized design was validated using CAE analysis. Results demonstrated that the brake thermal efficiency improved from 42.0% to 50.2%, achieving an 8.2-percentage-point increase with a relative improvement of 19.5%. |
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