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The effect of close post injection on combustion characteristics and cooling loss reduction

机译：密切注射后注射对燃烧特性及冷却损失减少的影响

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摘要

In previous study, post injection has shown a significant benefit in the reduction of soot emissions. Among them, the close post injection which only has short dwell between the main injection is supposed to be able to increase the thermal efficiency. The reduction of the cooling loss due to the main flame impingement is considered as the reason to the increase of thermal efficiency. However, there is a lack of study related to the influence of post injection timing and quantity on the combustion characteristics. Therefore, in this study, the engine performance and emission characteristics of injection strategy with close post injection was investigated. The post injection timing was modified from near zero interval to around 4.5 degrees CA from the end of main injection. In addition, the post injection quantity was modified from 3, 9, to 15 mm(3)/cycle and the intake pressure was modified from 170, 200, to 220 kPa while maintaining the total injection quantity at 39 mm(3)/cycle. In order to clarify the mechanism of cooling loss by applying post injection and the effect of injection dwell to the cooling loss and combustion characteristics, an optical engine was used to observe the combustion process. As a result, a certain dwell is needed to fully exploit the effect of cooling loss reduction by post injection.
机译：在以前的研究中，后注射显示出在减少烟灰排放中的显着益处。其中，仅在主喷射之间仅具有短暂的熔接后注射器应该能够提高热效率。由于主火焰冲击引起的冷却损失的降低被认为是增加热效率的原因。然而，缺乏与喷射后时序和数量对燃烧特性的影响有关的研究。因此，在本研究中，研究了具有密切后注射术的注射策略的发动机性能和排放特性。从主喷射结束时，从ZERE间隔内修改后的注射时间到约4.5度CA。此外，将后喷射量从3,9，15mm（3）/循环中修饰，进气压力从170,200，220kPa改性，同时保持总喷射量为39 mm（3）/循环。为了通过施加后注射施用和注射液到冷却损失和燃烧特性的效果来阐明冷却损失机理，使用光学发动机来观察燃烧过程。结果，需要一定的停留来充分利用通过后注射后冷却损失减少的效果。

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