上海交通大学学报

上海交通大学学报

• •    

预燃室通道参数对重型柴油机性能和排放的影响（网络首发）

  

  1. 1.南京工业大学机械与动力工程学院；2.天津大学先进内燃动力全国重点实验室
  • 基金资助:
    国家自然科学基金青年资助项目（51806097）； 先进内燃动力全国重点实验室开放研究项目(K2023-01)；

Effect of pre-chamber passage parameters on performance and emissions of a heavy-duty diesel engine

  1. (1.School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China；2. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

PDF (PC)

17

摘要： 本文采用数值模拟方法研究了两通道预燃室系统对重型柴油机大负荷工况下性能和排放的影响，通过优化两通道预燃室的通道夹角和通道直径，在NOx排放基本保持不变的情况下，提高了指示热效率，并降低了碳烟的排放。结果表明：在柴油机大负荷工况下，与原机对比，采用两通道预燃室方案可以缩短燃烧持续期，保证良好的燃烧相位，增强燃烧后期的湍动能，加强碳烟的氧化，提高指示热效率。最终选取预燃室两通道之间夹角为30°，两个通道与主燃烧室之间倾角为30°，通道直径为2mm的工况作为最优方案，该方案在NOx排放基本保持不变的情况下，使指示热效率提高0.12%，碳烟排放降低31.84%。

关键词: 重型柴油机, 预燃室, 通道夹角, 通道直径, 排放, 指示热效率

Abstract: This study employs numerical simulation to investigate the impact of a dual-passage prechamber system on the performance and emissions of a heavy-duty diesel engine under highload conditions. By optimizing the passage angle and diameter of the dual-passage prechamber, the indicated thermal efficiency is improved and soot emissions are reduced, while NOx emissions remain largely unchanged.The results indicate that, under high-load conditions, the dual-passage prechamber system shortens the combustion duration, ensures a favorable combustion phase, enhances turbulence kinetic energy during the late combustion stage, and strengthens soot oxidation, thereby improving the indicated thermal efficiency. The optimal configuration is determined to be a channel angle of 30° between the two passage, an inclination angle of 30° between the passage and the main combustion chamber, and a passage diameter of 2mm. This configuration increases the indicated thermal efficiency by 0.12% and reduces soot emissions by 31.84%, with NOx emissions remaining largely unchanged compared to the original engine. 

Key words: heavy-duty diesel engine, prechamber, passage angle, passage diameter, emissions, indicated thermal efficiency

中图分类号: