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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >CFD INVESTIGATION OF FUEL FILM FORMATION WITHIN A GDI ENGINE UNDER COLD START CRANKING OPERATION
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CFD INVESTIGATION OF FUEL FILM FORMATION WITHIN A GDI ENGINE UNDER COLD START CRANKING OPERATION

机译：冷启动裂解操作下GDI发动机内燃料膜形成的CFD研究

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A numerical study on the investigation of spray evolution and liquid film formation within the combustion chamber of a current production automotive Gasoline Direct Injected (GDI) engine characterised by a swirl-type side mounted injector is presented.rnParticularly, the paper focuses on low-temperature cranking operation of the engine, when, in view of the high injected fuel amount and the strongly reduced fuel vaporisation, wall wetting becomes a critical issue and plays a fundamental role on the early combustion stages. In fact, under such conditions, fuel deposits around the spark plug region can affect the ignition process, and even prevent engine start-up.rnIn order to properly investigate and understand the many involved phenomena, experimental visualisation of the full injection process by means of an optically accessible engine would be a very useful tool. Nevertheless, the application of such technique, far from being feasible from an industrial point of view, appears to be very difficult even in research laboratories, due to the relevant wall wetting at cranking conditions.rnA numerical program was therefore carried out in order to analyze in depth and investigate the wall/spray interaction and the subsequent fuel deposit distribution on the combustion chamber walls. The CFD model describing the spray conditions at the injector nozzle was previously implemented and validated against experimental evidence.rnMany different injection strategies were tested and results compared in terms of both fuel film characteristics and fuel/air mixture distribution within the combustion chamber.rnLow-temperature cranking conditions proved to be an open challenge for the in-cylinder numerical simulations, due to the simultaneous presence of many physical sub-modelsrn(spray evolution, droplet-droplet interaction, droplet-wall interaction, liquid-film) and the very low motored engine speed. Nevertheless, the use of a properly customized and validated numerical setup led to a good understanding of the overall injection process as well as of the effects of both injection strategy and spray orientation modifications on both the air/fuel and fuel/wall interaction.
机译：数值研究了一种以涡流式侧装式喷油器为特征的现成的汽车汽油直喷（GDI）发动机燃烧室内的喷雾演变和液膜形成的研究。rn，特别是针对低温鉴于高喷射燃油量和大大减少的燃油汽化，发动机的曲柄运转时，壁的润湿成为关键问题，并在早期燃烧阶段起着根本性的作用。实际上，在这种情况下，火花塞区域周围的燃油沉积会影响点火过程，甚至阻止发动机启动。为了正确地研究和理解许多涉及的现象，可以通过以下方式对整个喷射过程进行实验可视化：光学可访问引擎将是非常有用的工具。然而，由于从动工况下的相关壁润湿性，这种技术的应用从工业角度来看远非可行，甚至在研究实验室中也似乎非常困难。因此，为了进行分析，进行了数值程序深入研究壁/喷雾的相互作用以及随后在燃烧室壁上沉积的燃料。 CFD模型描述了喷油嘴处的喷雾条件，并已根据实验证据进行了验证.rn测试了许多不同的喷射策略，并根据燃烧室中的燃油膜特征和燃油/空气混合物分布对结果进行了比较.rn低温由于同时存在许多物理子模型（喷雾演变，液滴-液滴相互作用，液滴-壁相互作用，液膜）和非常低的动力，因此摇动条件对于缸内数值模拟是一个开放的挑战。引擎速度。尽管如此，使用适当定制和验证的数值设置仍可以使您对整个喷射过程以及喷射策略和喷雾方向修改对空气/燃料和燃料/壁相互作用的影响有很好的了解。

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