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Contribution à l'étude de l'impact de la cavitation sur les processus physiques de l'atomisation primaire des jets d'injecteurs essence

机译:为研究空化对汽油喷射器一次雾化的物理过程的影响做出的贡献

摘要

In order to get closer to the homogeneous mixture conditions of a gasoline engine, different fluids are injected into the atmosphere at varying upstream pressure and temperature. Five three-hole real injector prototypes from Continental were used. When injection pressure is increased, the internal flow goes through four regimes where the cavitation development level varies from one to another. The discharge coefficient Cd was found mainly dependent on the cavitation number. At the cavitation critical point, two correlations between Cd and the critical cavitation number on one side respectively, and the correspondent Reynolds number on the other side were found. The near field jet is ruled by three dimensionless numbers : Weber, Reynolds and cavitation. The effect of each one of them on the jet angle at the orifice outlet was obtained. By comparing the results of two injectors, it was found that the length over diameter ratio has a first order influence on the jet angle.
机译:为了更接近汽油发动机的均匀混合条件,将不同的流体以变化的上游压力和温度注入到大气中。使用了来自Continental的五个三孔真实喷油器原型。当注射压力增加时,内部流动会经历四种状态,其中空化发展水平会彼此不同。发现排出系数Cd主要取决于空化数。在空化临界点,分别发现Cd和临界空化数之间的两个相关性,以及另一侧的对应雷诺数。近场射流由三个无量纲数控制:韦伯,雷诺兹和空化。获得了它们中的每一个对节流孔出口处的喷射角的影响。通过比较两个喷射器的结果,发现长度与直径之比对喷射角具有一级影响。

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  • 作者

    Makhlouf Samir;

  • 作者单位
  • 年度 2015
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  • 原文格式 PDF
  • 正文语种 fr
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