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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Investigation of diesel combustion using multiple injection strategies for idling after cold start of passenger-car engines
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Investigation of diesel combustion using multiple injection strategies for idling after cold start of passenger-car engines

机译：乘用车发动机冷启动后使用多种喷射策略怠速进行柴油燃烧的研究

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摘要

A comprehensive investigation was carried out in order to better understand the combustion behaviour in a low compression ratio DI Diesel engine when multiple injection strategies are applied just after the engine cold starts in low temperature conditions(idling). More specifically, the aim of this study was twofold: on one hand, to understand the effect of the multiple injection strategies on the indicated mean effective pressure; on the other hand, to contribute to the understanding of combustion stability characterized by the coefficient of variation of indicated mean effective pressure. The first objective was fulfilled by analyzing the rate of heat release obtained by in-cylinder pressure diagnosis. The results showed that the timing of the pilot injection closest to the main injection was the most influential parameter based on the behaviour of the rate of heat release(regardless of the multiple injection strategy applied). For the second objective, the combustion stability was found to be correlated with the combustion centroid angle. The results showed a trend between them and the existence of a range of centroid angles where the combustion stability is strong enough. In addition, it was also evident that convenient split injection allows shifting the centroid to such a zone and improves combustion stability after start.
机译：为了更好地理解低压缩比DI柴油发动机在低温条件下发动机冷启动后立即采用多种喷射策略（空转）时的燃烧性能，进行了全面的研究。更具体地说，本研究的目的是双重的：一方面，了解多次注射策略对所指示的平均有效压力的影响;另一方面，了解多次注射策略对所指示的平均有效压力的影响。另一方面，有助于理解以指示平均有效压力的变化系数为特征的燃烧稳定性。通过分析缸内压力诊断获得的放热率来实现第一个目标。结果表明，最接近主喷射的先导喷射正时是最有影响力的参数，这取决于放热速率的行为（与采用的多次喷射策略无关）。对于第二个目的，发现燃烧稳定性与燃烧质心角相关。结果表明它们之间存在趋势，并且存在一定范围的质心角，其中燃烧稳定性足够强。另外，还明显的是，方便的分​​流喷射允许将质心转移到这样的区域，并提高了启动后的燃烧稳定性。

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