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首页> 外文会议>American Society of Mechanical Engineers(ASME) Internal Combustion Engine Division Fall Technical Conference(ICEF 2004); 20041024-27; Long Beach,CA(US) >IN-CYLINDER FUEL-AIR MIXTURE INVESTIGATION BY PARTICLE IMAGE VELOCIMETRY IN A GDI ENGINE
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IN-CYLINDER FUEL-AIR MIXTURE INVESTIGATION BY PARTICLE IMAGE VELOCIMETRY IN A GDI ENGINE

机译：GDI发动机中颗粒图像测速的缸内燃油混合气调查

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摘要

The present paper aims at providing experimental results on the spray structure and its interaction with the air flow generated by the intake ducts of a commercial light duty gasoline direct injection (GDI) engine head. The investigation was carried out by the Particle Image Velocimetry (PIV) technique to investigate the air flow and fuel droplets velocity evolution within a prototype cylinder with optical accesses. Experiments were carried out at various operating conditions reproducing the mixture preparation for an early injection strategy. The PIV technique was applied in a flow test rig assembled with a blower, which supplied the intake flow rate, connected to the intake manifold of a commercial 4-valve direct injection gasoline engine head modified to lay down an external driving control system for the valves motion. Experiments were taken equipping the engine head with a common rail injection system able to work up to 10 MPa, and a swirled type injector having a nozzle diameter of 0.50 mm and a nominal cone angle of 60°. Tests were taken, on a plane crossing the cylinder and the injector axes, supplying to the prototype cylinder an intake flow rate of 29 m~3/h and spraying the gasoline at two injection timings in a range' of injection pressure of 6, 8, and 10 MPa. The results provided detailed information on the intake flow field behavior and the evolution of fuel jet within the air flow. The intake flow velocity distribution, acquired at different cam angles during the induction, showed the development of an initial clockwise tumble flow with a tendency to produce two large flow structures: a main counter clockwise vortex and a clockwise ones located at the opposite side of the field of view. Images of the interaction of the fuel with the tumble motion displayed, firstly, a fuel jet shape that traveled not affected by the tumble motion because of its high momentum. Later during the intake, the fuel was strongly distorted by the air motion with the formation of clusters detached from the main jet and spread within the cylinder so allowing to hypothesize that the intake bulk flow may be a crucial parameter to control the fuel penetration and the droplets distribution within the cylinder.
机译：本文旨在提供有关喷雾结构及其与商用轻型汽油直喷（GDI）发动机缸盖进气管产生的气流相互作用的实验结果。该研究是通过粒子图像测速技术（PIV）进行的，以研究具有光学通道的原型气缸内的空气流动和燃料液滴的速度演变。在各种操作条件下进行了实验，再现了用于早期注射策略的混合物制剂。 PIV技术应用于装配有鼓风机的流量试验台上，该鼓风机提供进气流量，并连接到商用4气门直喷汽油发动机机头的进气歧管，改装后该气门经改装以放置用于阀的外部驱动控制系统运动。进行了实验，为发动机盖配备了能够工作至10 MPa的共轨喷射系统，以及旋流式喷油嘴，喷嘴直径为0.50 mm，公称锥角为60°。在与气缸和喷油器轴线交叉的平面上进行了测试，向原型气缸提供了29 m〜3 / h的进气流量，并在6、8的喷射压力范围内的两个喷射时刻喷射了汽油和10 MPa。结果提供了有关进气流场行为和空气流中的燃料射流演变的详细信息。在进气过程中以不同的凸轮角获取的进气流速分布显示出初始的顺时针滚流的发展，并倾向于产生两个大的流动结构：主逆时针旋涡和顺时针旋涡位于旋流的相反侧。视野。首先显示了燃料与滚筒运动的相互作用的图像，该燃料喷射形状由于其高动量而不受滚筒运动影响。在进气的后期，由于空气的运动，燃料强烈变形，形成了从主喷嘴分离并在气缸内散布的团簇，因此可以假设进气总流量可能是控制燃料渗透和控制的关键参数。液滴在圆柱体内的分布。

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