Biodiesel fuels and the influence of multiple injection

生物柴油燃料和多次喷射的影响

• 批准号: 312392-2010
• 负责人: Seers, Patrice
• 金额: $ 1.75万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=526493
• 关键词: Biodiesel; fuels; influence; multiple; injection

The proposed research program will investigate the influence of biodiesel blends on the multiple injection strategy requirement that optimise engine pollutant emission and performance. To do so, it is proposed to study experimentally with a diesel common-rail engine how the injection strategy influence regulated and unregulated pollutant emissions. Assessment of the influence of injection timing, time between injection and percentage of mass injected at each injection will be pursued for each biodiesel blends. Therefore optimum injection strategy as a function of blend will be assessed. To gain a better insight at how the multiple injection affects the mixture formation process, it is proposed studying under the control environment of a closed vessel the injection process with high speed camera imaging and laser fluorescence as to determine spray tip penetration, droplet size and to distinguish the liquid and vapour phases. To gain a better insight at the influence of the blended fuel properties on the spray formation process, numerical simulations will also be achieved. First, the simulation will reproduce the closed vessel experiments allowing a validation of the numerical model. The simulations will include a multicomponent fuel model taking into account the true nature of the fuel. In the last step, engine 3D simulations will be pursued to reproduce the engine experiment and to quantify how the fuel properties influence the mixture formation process in engine with a triple injection strategy. Furthermore, the simulations will include the fluid dynamic effect of the common-rail system on the injection process. To achieve this, a 1D model of a common-rail system is reproduced and coupled to the 3D cylinder simulations. Finally, the simulation will allow the coupling of the mixture formation process and in-cylinder flow and help identify must have fuel properties that can minimize pollutant emissions and favor the mixture formation process and combustion.

建议的研究计划将调查生物柴油混合物的影响，优化发动机污染物排放和性能的多次喷射策略的要求。为此，建议用柴油共轨发动机实验研究喷射策略如何影响管制和非管制污染物排放。将对每种生物柴油混合物的喷射正时、喷射间隔时间和每次喷射时喷射质量百分比的影响进行评估。因此，将评估作为混合函数的最佳注射策略。为了更好地了解多次喷射如何影响混合物形成过程，建议在密闭容器的控制环境下研究喷射过程，使用高速摄像机成像和激光荧光来确定喷雾尖端穿透力、液滴尺寸并区分液相和气相。为了更好地了解混合燃料特性对喷雾形成过程的影响，还将实现数值模拟。首先，模拟将再现密闭容器实验，从而验证数值模型。模拟将包括一个考虑到燃料真实性质的多组分燃料模型。在最后一步中，发动机3D模拟将继续再现发动机实验，并量化燃料特性如何影响三次喷射策略的发动机中的混合气形成过程。此外，模拟将包括共轨系统对喷射过程的流体动力学效应。为了实现这一点，共轨系统的1D模型被复制并耦合到3D气缸模拟。 最后，模拟将允许混合气形成过程和缸内流动的耦合，并帮助识别必须具有的燃料特性，可以最大限度地减少污染物排放，有利于混合气形成过程和燃烧。