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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >The effect of diesel engine operating conditions on exhaust particle size distributions
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The effect of diesel engine operating conditions on exhaust particle size distributions

机译：柴油机工况对排气颗粒尺寸分布的影响

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摘要

Owing to the negative effects that aerosols have on human health, the interest in knowing the size and the amount of particulate matter emitted by diesel engines is increasing. The measurement of this kind of aerosol is mainly influenced by three parameters: the ambient conditions, the sampling method used to characterize the emissions together with the system used to determine the particle size distributions, and, finally, the physical and chemical characteristics of the aerosol, which are a direct consequence of those processes occurring in the engine (composition, size, and concentration of particles in the aerosol, amount of volatile organic compounds, sulphur compounds, and different residues coming from the additives used in fuels and lubricants, etc.). An experimental study has been developed which combines the use of a partial dilution minitunnel and a scanning mobility particle sizer. The aim is to study the influence that the engine operating conditions which the driver can control by using the throttle while driving a vehicle, i.e. the torque and engine speed, have on the particle size distribution and its statistical parameters, namely the mean diameter and total concentration. This study was carried out on a light-duty direct-injection diesel engine which is used currently on European roads. Four steady operation modes were tested, from the most emissions-significant zones of the engine map. Likewise, a complementary study has been developed for a better understanding of the combined effect of both fuel-to-air and exhaust gas recirculation (EGR) ratios. In this latter study the EGR was completely eliminated from the engine modes previously studied.
机译：由于气雾剂对人体健康的负面影响，人们越来越了解柴油发动机排放的颗粒物的大小和数量。这种气雾剂的测量主要受以下三个参数影响：环境条件，用于表征排放物的采样方法以及用于确定粒径分布的系统，最后是气雾剂的物理和化学特性，这是发动机中发生的那些过程的直接结果（气溶胶中颗粒的组成，大小和浓度，挥发性有机化合物，硫化合物的量以及来自燃料和润滑剂中使用的添加剂的不同残留物等）。 ）。已经进行了一项实验研究，该研究结合了部分稀释微型隧道和扫描迁移率粒度仪的使用。目的是研究驾驶员在驾驶车辆时可以通过使用油门控制的发动机工况，即扭矩和发动机转速，对粒径分布及其统计参数（平均直径和总粒径）的影响。浓度。这项研究是针对目前在欧洲道路上使用的轻型直喷柴油发动机进行的。从发动机图中最重要的排放区域测试了四种稳定运行模式。同样，已经开展了一项补充研究，以更好地理解燃料-空气和废气再循环（EGR）比率的综合影响。在后面的研究中，从先前研究的发动机模式中完全消除了EGR。

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