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首页> 外文期刊>Energy Conversion & Management >Effects of spray behavior and wall impingement on particulate matter emissions in a direct injection spark ignition engine equipped with a high pressure injection system
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Effects of spray behavior and wall impingement on particulate matter emissions in a direct injection spark ignition engine equipped with a high pressure injection system

机译：喷雾行为与墙体冲击对高压喷射系统的直喷火花点火发动机颗粒物质排放的影响

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摘要

The effects of injection pressure on spray behaviors governing particulate matter emissions were investigated for various injection timings and engine loads in an optically accessible single cylinder engine equipped with gasoline direct injection system. In a spray visualization and particle number (PN) measurement experiment, injection timing and engine load were varied to examine their effects on the spray behavior including cylinder wetting that causes the emission of particulate matter. The analysis was based on the time-averaged spray images, spray variations between the cycles, combustion, and PN emission characteristics. The spray structure in the cylinder under the engine operating conditions used in the present study was a collapsed spray that was evident at high pressure injection under atmospheric conditions. For an injection timing of before top death center (BTDC) 300 deg, at the initial stage of the intake process, the magnitude of spray deflection formed by the in-cylinder flow interacting with the spray in the reverse direction increased owing to the high pressure injection promoting fuel atomization and increasing the effects of the in-cylinder flow. The spray variations between the cycles caused by the in-cylinder flow in the region of spray deflection were also increased by high pressure injection. When the weak in-cylinder flow was formed in the late intake process (BTDC 210 deg), increasing the injection pressure accelerated the initial droplet velocity and increased the amount of fuel reaching the cylinder wall opposite the injector, thus increasing the wall film and PN emissions. In contrast, for the conditions under which the wall film was formed on the piston top by fuel interaction, the large droplet momentum corresponding to high pressure injection increased in the amount of rebounded droplets at collision, thereby reducing the amount of wall film and PN emissions.
机译：研究了注射压力对喷射行为的影响，用于在配备有汽油直喷系统的光学可接近的单缸发动机中进行颗粒状物质排放的喷雾行为。在喷射可视化和粒子数（PN）测量实验中，改变喷射正时和发动机负荷，以检查它们对喷射行为的影响，包括导致颗粒物质的发射的气缸润湿。该分析基于时间平均喷雾图像，循环，燃烧和PN发射特性之间的喷射变化。在本研究中使用的发动机操作条件下的汽缸中的喷雾结构是在大气条件下高压注射的塌陷喷雾。对于顶部死亡中心（BTDC）300°的喷射定时，在进气过程的初始阶段，由于高压，通过缸内流动与喷射的缸内流动相互作用的喷射偏转的大小增加注射促进燃料雾化并增加缸内流动的影响。通过高压注射也增加了由喷射偏转区域中的圆柱体流动引起的循环循环之间的喷射变化。当在晚期进气过程（BTDC 210°）中形成弱的缸流量时，增加喷射压力加速初始液滴速度并增加了向喷射器相对的汽缸壁的燃料量增加，从而增加了壁膜和PN排放。相反，对于通过燃料相互作用在活塞顶部形成在活塞顶部的条件下，对应于高压注射的大液滴动量在碰撞时的反弹液滴的量增加，从而减少了壁膜和PN排放量。

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