直喷汽油发动机工作在废气再循环模式下缸内NO激光诱导荧光的定量成像

2017/09/08   下载量： 3 次

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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 其他>其他
参考标准 暂无

采用LaVision公司以增强型CCD相机为核心构建的平面激光诱导荧光（PLIF）测试系统，对直喷汽油发动机工作在废气再循环模式下缸内NO激光诱导荧光的定量成像进行了测量和分析。

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The influence of exhaust gas recirculation (EGR) on the
formation of nitric oxide (NO) was studied experimentally
in a transparent gasoline direct injection engine by quantitative
laser-induced fluorescence imaging. Spectral
properties of the excited transition within the NO A2Σ+–
X2Π(0,2) band are well known from previous studies. The
excitation scheme allows quantitative NO concentration
measurements without detailed knowledge of the gas
phase temperature. Good agreement was found with
exhaust gas NOx chemi-luminescence (CLD) measurements.
The experiments were carried out in an optically accessible
gasoline engine featuring a direct injection cylinder
head (BMW) and a Bosch injection system, based on a
serial inline six-cylinder engine with an enlarged crankcase.
The measurements were performed in the pentroof
section of the combustion chamber.
Various concentrations (0, 10 and 16%) and compositions
(pure nitrogen, nitrogen / carbon dioxide and nitrogen
/ carbon dioxide / water) of synthetic exhaust gas
were investigated. NO formation could be significantly
reduced by EGR, from an average of about 1200 ppm
(without EGR) to about 200 ppm (16% EGR-rate). The
NO formation decreased steadily with increasing heat
capacity of the inert gases present, independent of their
chemical composition. In the temporal evolution of the
NO formation, a retarded onset of up to 5° CA was found
with 16% EGR. The two-dimensional NO concentration
fields appeared to be very homogeneous when adding
16% EGR, whereas without EGR, strong inhomogeneities
with local NO peak concentrations of up to 3400 ppm
were detected.

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 在发动机气缸内进行激光诱导荧光（LIF）测量时对激光吸收的一种修正方法

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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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