采用火花塞引燃发动机内冷焰组分的激光诱导荧光方法进行火焰传播可视化研究

2017/09/13   下载量： 4 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 热性能>燃烧特性
参考标准 暂无

采用LaVsion公司特色的增强型CCD相机为核心部件，构成平面激光诱导荧光测试系统。利用该系统对火花塞引燃发动机内冷焰组分的传播进行了可视化研究。

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The flame propagation in a spark-ignition engine has been studied using
laser-induced fluorescence (LIF) of species formed during the first ignition
stage of hydrocarbon combustion. The detected two-dimensional LIF
images showed the distribution of unburned regions. For the excitation, two
Nd:YAG lasers operating at 355 nm were used for two consecutive
measurements within the same engine cycle with adjustable time separation
between the pulses. Two ICCD cameras that were synchronized to each of
the laser pulses recorded pairs of fluorescence images, i.e. the movement of
the flame front could be tracked. It is well known that formaldehyde is
excited using a wavelength of 355 nm and a spectral signature of this species
was also identified in engine LIF spectra. Programme routines were
developed and used for evaluation of the flame propagation velocity from
the fluorescence images. This paper presents the potential and the
characteristics of the experimental technique as well as the evaluation
procedure. The measurements of cool-flame intermediates have also been
compared with measurements of fuel-tracer as an indicator of unburned
fuel–air mixture. A good agreement between position and shape of the
signal areas was obtained at crank angles where both fluorescence signal
from cool-flame species excited at 355 nm and added 3-pentanone excited at
266 nm could be 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 直喷火花塞引燃（DISI）发动机内燃料分布，引燃和燃烧过程的曲轴角分辨成像

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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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