Newly identified effects of injector nozzle fouling in diesel engines
Newly identified effects of injector nozzle fouling in diesel engines
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DOI：
10.1016/j.fuel.2020.118336
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发表时间：
2020-10
期刊：
影响因子：
7.4
通讯作者：
R. Burke;M. Madamedon;R. Williams
中科院分区：
文献类型：
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作者：
R. Burke;M. Madamedon;R. Williams
本文介绍了柴油机喷油器结垢的最新影响。喷射器结垢不仅会限制和破坏燃料流入燃烧室，而且对发动机有更广泛的影响，这些都是本文的重点。在一台2.2L柴油机上，通过在两种柴油中添加锌，综合诱发喷油器结垢。提出了一种新的结垢程度度量，该度量允许在全负荷和部分负荷下对结垢进行一致的比较。调查已经确定了对空气和燃料泵送损失以及燃烧相位的影响，这些影响使制动器热效率降低高达3%。在代表道路条件（WLTC）的瞬态循环期间也观察到这些影响。这是重要的，因为喷射器结垢的影响通常仅在高负荷和稳态条件下进行研究。WLTC结果还表明，由于喷嘴沉积物，NOx（9%-18%）和CO2（高达1%）排放量增加。结垢影响的大小被发现与基础燃料类型和测试条件不同。高性能燃油添加剂的高剂量率在清除沉积物和恢复正常发动机性能方面是有效的。
This paper describes newly identified effects of fouled injectors in diesel engines. As well as restricting and disrupting fuel flow into the combustion chamber, injector fouling has wider impacts on the engine, and these form the focus of this work. Injector fouling was induced synthetically through the addition of zinc to two types of Diesel fuel on a 2.2L engine. A new degree of fouling metric was presented that allows for a consistent comparison of fouling at full and part load. The investigation has identified impacts on air and fuel pumping losses and on combustion phasing that deteriorate brake thermal efficiency by up to 3%. The effects were also seen during a transient cycle representative of on-road conditions (WLTC). This is significant because the effects of injector fouling are typically only studied at high loads and under steady state conditions. The WLTC results also demonstrated an increase in NOx (9%–18%) and CO2(up to 1%) emissions as a result of nozzle deposits. The magnitudes of fouling effects were found to vary both with base fuel type and with test condition. A premium dose rate of performance fuel additive was effective at cleaning up the deposits and restoring normal engine performance.