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首页> 外文期刊>Combustion Science and Technology >Towards Identifying Flame Patterns in Multiple, Late Injection Schemes on a Single-Cylinder Optical Diesel Engine
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Towards Identifying Flame Patterns in Multiple, Late Injection Schemes on a Single-Cylinder Optical Diesel Engine

机译：致力于在单缸光学柴油机上的多个后期喷射方案中识别火焰模式

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The work investigates the effect of various post-injection strategies on the flame patterns in a Ricardo Hydra optical single-cylinder, light-duty diesel engine, operated in a partially premixed combustion mode, under low load (IMEP: ca. 2.3 bar), low speed (1200 rpm) conditions. The effect of post-injection fuel amount (12% and 24% of the total fuel quantity per cycle) and post-injection timing (0, 5, 10 deg aTDC) are investigated via pressure trace analysis and optical measurements. Flame propagation is captured by means of high-speed flame natural luminosity imaging and of CH*, C-2*, and OH* line-of-sight chemiluminescence measurements. Results suggest that post-injections suppress mixture reactivity but enhance oxidation, and that a larger amount of fuel and/or later post-injection, leads to higher levels of natural luminosity, indicating possible higher soot-out emissions, while post-injection close to the main combustion event appears to have a beneficial effect on the soot oxidation processes.
机译：这项工作研究了在低负荷（IMEP：约2.3 bar），部分预混燃烧模式下运行的里卡多·海德拉光学单缸轻型柴油发动机中，各种后喷射策略对火焰模式的影响，低速（1200 rpm）条件下。通过压力痕量分析和光学测量研究了喷射后燃料量（每个循环总燃料量的12％和24％）和喷射后正时（0、5、10度aTDC）的影响。火焰传播是通过高速火焰自然光度成像以及CH *，C-2 *和OH *视线化学发光测量来捕获的。结果表明，喷后抑制了混合物的反应性，但增强了氧化作用，并且大量的燃料和/或后期喷后导致较高的自然光度，表明可能有更高的烟尘排放，而喷后接近主要燃烧事件似乎对烟灰氧化过程具有有益的影响。

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