采用激光诱导荧光方法测量火花塞引燃汽油发动机燃烧室表面燃料薄膜的厚度

2017/09/13   下载量： 3 次

方案摘要

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应用领域 汽车及零部件
检测样本 汽车电子电器
检测项目 理化分析>其他
参考标准 暂无

采用LaVision公司以增强型CCD相机为核心部件构成的平面激光诱导荧光测试系统和喷雾激光成像方法，对火花塞引燃汽油发动机中燃烧室表面燃料薄膜的厚度今行了测量和研究。

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Up to 90% of the unburnt hydrocarbon emissions (UHCs) from modern 4-stroke gasoline engines occur during cold
starting. Slow vapourisation particularly from films of fuel in the intake port, and on the manifold and cylinder walls leads
regions of rich mixture and incomplete combustion. To reduce UHCs it is useful to know where, and how thick, these wall
films are during the intake and compression strokes.
In the present work the fuel film is imaged and its depth measured with a laser induced fluorescence technique. The
technique uses a with a pulsed laser, diffuse illumination and a camera and images the film on the metal combustion
chamber surface, in an inexpensive rig closely approximating the flow in an port injected gasoline engine under cold
start. The temporal resolution of ~100ns and spatial resolution of ~0.5mm are sufficient to reveal the detailed dynamics of
the film formation and transport.
The technique functions well in the imperfect optical environment of a piston engine cylinder. In contrast to previous
studies the film depth is measured, quantitatively, on the metal combustion chamber surface with correct roughness and
film transport properties, rather than on a smooth glass wall. The uncertainty in depth is ±16mm but may be reduced to
±5mm. With open valve injection a 30±16mm thick film forms on the exhaust side cylinder wall. Such films lead to high
unburnt hydrocarbon (UHC) emissions. The technique has high temporal (100ns) and spatial (0.5mm) resolution and may
be applied to acceleration transients, lubricating oil films, GDI and Diesel engines.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 采用米氏和激光诱导荧光成像研究汽车燃料喷嘴产生的丙烷/液化石油气（LPG）喷雾结构与燃料和环境压力的关系

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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