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首页> 外文期刊>Environmental Science & Technology >Influence of Engine Operating Conditions on Diesel Particulate Matter Emissions in Relation to Transient and Steady-State Conditions
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Influence of Engine Operating Conditions on Diesel Particulate Matter Emissions in Relation to Transient and Steady-State Conditions

机译：发动机工况对柴油机颗粒物排放的影响与瞬态和稳态条件的关系

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摘要

Airborne particulate matter is an important pollutant affecting air quality. Currently, diesel PM regulations are based on emitted particle mass; however, the particle size distributions are also important factors in air quality. While the distributions of particulate emissions under steady-state conditions are well-known and have been generalized, varying distributions undertransient conditions are not well-understood. This study investigates the size distributions of PM, focusing on the nuclei- and accumulation-modes, emitted from diesel engines under transient operations. Some engine conditions during transient testing produced particle size distributions that were notably different from those produced under steady-state conditions. During transient operation, the size distributions were either mono- or bimodal with peaks that were able to switch quickly between the nuclei- and accumulation-modes. These distributions have not been observed during steady-state testing but are significant because environmental and health effects and emission control solutions are highly dependent on particle size.
机译：空气中的颗粒物是影响空气质量的重要污染物。目前，柴油机PM法规是基于排放的颗粒质量的。然而，粒径分布也是空气质量的重要因素。尽管稳态条件下的颗粒物排放分布是众所周知的，并且已经得到了概括，但对于瞬态条件下的变化分布却知之甚少。这项研究调查了瞬态运行下柴油机排放的PM的尺寸分布，重点是核模式和累积模式。在瞬态测试过程中，某些发动机工况产生的粒径分布与稳态工况下产生的粒径分布明显不同。在瞬态操作期间，大小分布为单峰或双峰，并且具有能够在核模式和累积模式之间快速切换的峰。这些分布在稳态测试过程中未观察到，但是很重要，因为环境和健康影响以及排放控制解决方案高度依赖于粒径。

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