Stability Analysis of the Fluorescent Tracer 1-Methylnaphthalene for IC Engine Applications by Supercontinuum Laser Absorption Spectroscopy
Stability Analysis of the Fluorescent Tracer 1-Methylnaphthalene for IC Engine Applications by Supercontinuum Laser Absorption Spectroscopy
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DOI：
10.3390/s20102871
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发表时间：
2020-05-01
期刊：
影响因子：
3.9
通讯作者：
Zigan, Lars
中科院分区：
文献类型：
--
作者：
Fendt, Peter;Retzer, Ulrich;Zigan, Lars
1-甲基萘(1-MN)是一种广泛使用的激光诱导荧光(LIF)示踪剂，用于内燃机混合气形成和温度分布的平面成像。由于LIF测量结果可能会受到部分示踪剂氧化的影响，因此在校准池中分析了1-MN和基础燃料异辛烷的转化率。首先，介绍了利用超连续谱激光吸收光谱(SCLAS)进行测量，以便通过检测产生的H2O摩尔分数来量化转化率。提出了一种单模光纤(SMF)耦合装置，将纤芯作为Czerny-Turner光谱仪的入射狭缝。在压力高达1.5兆帕，温度高达900K的情况下，观察到明显的示踪剂和燃料消耗，对停留时间和全球空燃比有依赖关系。使用带后向反射器的自稳定双程装置，部分补偿了由于强波束控制而造成的信号损失。
1-methylnaphthalene (1-MN) is a widely used laser-induced fluorescence (LIF) tracer for planar imaging of mixture formation and temperature distributions in internal combustion (IC) engines. As the LIF measurement results can be biased by partial tracer oxidation, the conversion of 1-MN and the base fuel isooctane is analyzed in a calibration cell. First, measurements using supercontinuum laser absorption spectroscopy (SCLAS) are presented in order to quantify the conversion by detection of the produced H2O mole fraction. A single mode fiber (SMF) coupled setup is presented, with the fiber core acting as entrance slit of a Czerny-Turner spectrometer. Dependencies on residence time and global air-fuel ratio are presented at pressures up to 1.5 MPa and temperatures up to 900 K, at which distinct tracer and fuel consumption is observed. Signal loss due to intense beam steering was partially compensated using a self-stabilizing double-pass setup with a retroreflector.