柴油机燃烧室优化改善排放性能的数值模拟研究
Numerical Simulation of Diesel Combustion Chamber Optimization to Improve Emission Performance
朱恒鹏 1郑培1
作者信息
- 1. 内蒙古工业大学能源与动力工程学院,呼和浩特 010051
- 折叠
摘要
以某车用四缸柴油机为研究对象,利用CAESES与CONVERGE两软件联合仿真改变燃烧室线形,进行了降低氮氧化物(NOx)与碳烟颗粒物(SOOT)的双目标优化,得到在额定功率定压缩比下提高柴油机排放性能的最佳案例,对排放相关方案进行了分析,探究了燃烧室相关参数对NOx与SOOT排放性能的影响.结果表明:针对此款柴油机,在不改变压缩比的前提下,利用两款软件联合仿真优化得到的双目标最佳优化方案在保证动力性与经济性的基础上,NOx与SOOT的排放相较于原机分别降低了 8％与11.7％.对3个关键参数分析发现,在该状态下,喉口深度与唇口半径对NOx与SOOT排放影响程度大,底部凹弧半径对其影响程度小.
Abstract
Taking a four cylinder diesel engine used in a certain vehicle as the research object,the combustion chamber shape was changed through joint simulation using CAESES and CONVERGE software,and a dual objective optimization was carried out to reduce NOx and SOOT.The best case of improving diesel engine emission performance under rated power and constant compression ratio was obtained.The emission related schemes were analyzed,and the influence of combustion chamber related parameters on NOx and SOOT emission performance was explored.The results show that for this diesel engine,the dual objective optimal optimiza-tion scheme obtained through joint simulation and optimization using two software programs,without changing the compression ratio,reduces NOx and SOOT emissions by 8％and 11.7％respectively compared to the original engine,while ensuring power and economy.Analysis of three key parameters reveals that in this state,the depth of the throat and the radius of the lip have a greater impact on NOx and SOOT emissions,while the radius of the concave arc at the bottom has a smaller impact.
关键词
柴油机/燃烧室结构/排放性能/优化设计Key words
Diesel engine/Combustion chamber structure/Emission performance/Optimization design引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据