Approaches for Detailed Investigations on Transient Flow and Spray Characteristics during High Pressure Fuel Injection
Approaches for Detailed Investigations on Transient Flow and Spray Characteristics during High Pressure Fuel Injection
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DOI：
10.3390/app10124410
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
Noritsune Kawaharada;Lennart Thimm;Toni Dageförde;K. Gröger;H. Hansen;F. Dinkelacker
中科院分区：
文献类型：
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作者：
Noritsune Kawaharada;Lennart Thimm;Toni Dageförde;K. Gröger;H. Hansen;F. Dinkelacker
高压喷射系统在实现内燃机高度可控的燃油喷射方面发挥着重要作用。喷雾近场甚至喷射器内部的初级雾化过程决定了随后的喷雾发展，对燃烧和污染物的形成具有相当大的影响。因此，应尽可能理解流程；例如，开发数学和数值模型。然而，由于几何尺度非常小、高度集中的光学密集喷雾过程以及喷雾的高速和剧烈瞬态性质，实验难度极高，特别是在喷射器喷嘴附近或喷嘴内部。在这项研究中，采用了几种独特且部分最近开发的技术来详细测量喷嘴内的流量以及喷嘴附近的喷雾发展。尽可能使用相同的高压柴油喷射三孔喷油器来利用和比较不同的测量方法。在综合部分，采用该方法对测量结果进行比较讨论。可以将喷油器内部和外部的观察结果结合起来，并讨论高压柴油喷雾的整个喷雾开发过程。这使得人们能够证实理论并提供详细的、部分甚至定量的数据来验证数值模型。
High pressure injection systems have essential roles in realizing highly controllable fuel injections in internal combustion engines. The primary atomization processes in the near field of the spray, and even inside the injector, determine the subsequent spray development with a considerable impact on the combustion and pollutant formation. Therefore, the processes should be understood as much as possible; for instance, to develop mathematical and numerical models. However, the experimental difficulties are extremely high, especially near the injector nozzle or inside the nozzle, due to the very small geometrical scales, the highly concentrated optical dense spray processes and the high speed and drastic transient nature of the spray. In this study, several unique and partly recently developed techniques are applied for detailed measurements on the flow inside the nozzle and the spray development very near the nozzle. As far as possible, the same three-hole injector for high pressure diesel injection is used to utilize and compare different measurement approaches. In a comprehensive section, the approach is taken to discuss the measurement results in comparison. It is possible to combine the observations within and outside the injector and to discuss the entire spray development processes for high pressure diesel sprays. This allows one to confirm theories and to provide detailed and, in parts, even quantitative data for the validation of numerical models.