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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Influence of the exhaust gas turbocharger on nano-scale particulate matter emissions from a GDI spark ignition engine
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Influence of the exhaust gas turbocharger on nano-scale particulate matter emissions from a GDI spark ignition engine

机译：废气涡轮增压器对GDI火花点火发动机排放的纳米级颗粒物的影响

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摘要

The influence of the exhaust gas turbocharger on nano-scale Particulate Matter (PM) number emissions from a Gasoline Direct Injected (GDI) engine is investigated at fixed exhaust gas dilution ratio for a matrix of three engine speeds and four engine load operating points. Experimental repeatability is assessed by means of the Coefficient of Variation (CoV) from three independent measurements for every test point. A hypothesis test on the difference between total number count before and after the turbine shows that there are statistically relevant variations for most operating points. A reduction in PM total number count at low load is observed, and an increment at high load. It is conjectured that as fuel injection pressure and duration increase with load, a larger share of volatile particulate matter is produced, which then undergoes nucleation as the exhaust gas expands through the turbine. At the same time, the centrifugal action within the turbocharger is believed to promote particle agglomeration and growth, and fragmentation of micro-scale particles. Experiments with variable dilution ratio at a fixed engine test point show that changes in dilution ratio affect repeatability of the emissions measurements only marginally. Yet, a hypothesis test on the variation of total number count with dilution shows that PM number counts are systematically affected by changes in dilution ratio. Furthermore, a hypothesis test also shows that the impact of the turbocharger on total number emissions is statistically relevant regardless of the dilution ratio adopted. (C) 2014 Elsevier Ltd. All rights reserved.
机译：针对三个发动机转速和四个发动机负载工作点的矩阵，以固定的废气稀释率研究了废气涡轮增压器对汽油直喷（GDI）发动机的纳米级颗粒物（PM）数量排放的影响。通过对每个测试点进行三个独立测量得出的变异系数（CoV）来评估实验可重复性。对涡轮机前后总计数之间的差异进行的假设检验表明，对于大多数工作点，存在统计上相关的变化。在低负载下，PM总计数减少，而在高负载下，PM总数增加。据推测，随着燃料喷射压力和持续时间随着负载的增加而增加，会产生较大份额的挥发性颗粒物质，然后当废气通过涡轮膨胀时会发生成核作用。同时，涡轮增压器内的离心作用被认为促进了颗粒的团聚和生长以及微米级颗粒的破碎。在固定的发动机测试点进行可变稀释比的实验表明，稀释比的变化只会对排放测量的可重复性产生很小的影响。然而，对总数随稀释度变化的假设检验表明，PM数计数受到稀释率变化的系统影响。此外，假设检验还表明，无论采用何种稀释比，涡轮增压器对总排放量的影响在统计上都是相关的。 （C）2014 Elsevier Ltd.保留所有权利。

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