• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Naval Architecture and Ocean Engineering >The effect of dynamic operating conditions on nano-particle emissions from a light-duty diesel engine applicable to prime and auxiliary machines on marine vessels
【24h】

The effect of dynamic operating conditions on nano-particle emissions from a light-duty diesel engine applicable to prime and auxiliary machines on marine vessels

机译：动态工况对适用于船舶船舶主辅机的轻型柴油机纳米颗粒排放的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

ABSTRACT This study presents the nano-sized particle emission characteristics from a small turbocharged common rail diesel engine applicable to prime and auxiliary machines on marine vessels. The experiments were conducted under dynamic engine operating conditions, such as steady-state, cold start, and transient conditions. The particle number and size distributions were analyzed with a high resolution PM analyzer. The diesel oxidation catalyst (DOC) had an insignificant effect on the reduction in particle number, but particle number emissions were drastically reduced by 3 to 4 orders of magnitude downstream of the diesel particulate filter (DPF) at various steady conditions. Under high speed and load conditions, the particle filtering efficiency was decreased by the partial combustion of trapped particles inside the DPF because of the high exhaust temperature caused by the increased particle number concentration. Retarded fuel injection timing and higher EGR rates led to increased particle number emissions. As the temperature inside the DPF increased from 25 °C to 300 °C, the peak particle number level was reduced by 70% compared to cold start conditions. High levels of nucleation mode particle generation were found in the deceleration phases during the transient tests.
机译：摘要这项研究提出了一种小型涡轮增压共轨柴油机的纳米级颗粒排放特性，该发动机适用于船舶的原动机和辅助机器。实验是在动态发动机工况下进行的，例如稳态，冷启动和过渡工况。用高分辨率PM分析仪分析颗粒数目和尺寸分布。柴油机氧化催化剂（DOC）对减少颗粒数量影响不大，但是在各种稳定条件下，在柴油机微粒过滤器（DPF）下游，颗粒数量的排放量大幅度减少了3-4个数量级。在高速和高负荷条件下，由于颗粒数量浓度增加导致排气温度升高，DPF内部捕集的颗粒部分燃烧而降低了颗粒过滤效率。延迟的燃油喷射正时和较高的EGR率导致增加的颗粒数量排放。当DPF内部的温度从25°C升高到300°C时，与冷启动条件相比，峰值颗粒数水平降低了70％。在瞬态测试期间的减速阶段，发现了高水平的成核模式颗粒生成。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号