在真实的喷射导引直喷汽油发动机缸内进行NO激光诱导荧光成像的定量研究

2017/09/13   下载量： 5 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

以LaVision公司的特色产品，增强型CCD相机为核心硬件构成PLIF测量系统。利用PLIF测量系统在真实的喷射导引直喷汽油发动机缸内进行了NO激光诱导荧光成像的定量研究。

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Limiting the in-cylinder nitric oxide (NO) formation is a crucial task in the development of engines with
gasoline direct injection. Exhaust gas aftertreatment requires storage catalysts that tolerate a maximum
NO flux only, and the frequency of energy consuming catalyst regeneration cycles is directly correlated
with engine-out NO. We present quantitative in-cylinder imaging measurements of NO mole fractions
in a gasoline engine with spray-guided direct injection using laser-induced fluorescence (LIF). The optical
engine design was kept close to that of a serial four-cylinder engine. Optical access was achieved via sapphire
windows, requiring only minor modifications to the engine block. The engine was operated with commercial
gasoline and fired continuously. The data interpretation applies the spectral simulation tool
LIFSim to calculate pressure, temperature, and gas-composition dependencies of the LIF signal. Temperature-
dependent CO2 absorption cross-sections are used to correct for laser and signal attenuation. A sensitivity
analysis of the quantitative NO concentrations on the different parameters entering the evaluation is
presented. The LIF measurements are compared to results from in-cylinder fast gas sampling through a
modified spark plug. The two techniques show good quantitative agreement. The LIF measurements are
also compared to charge-averaged working-cycle-resolved NO chemiluminescence measurements in the
exhaust port. NO-LIF imaging results are presented for stratified engine operation with different levels
of exhaust gas recirculation (EGR), showing the large impact of EGR on in-cylinder NO formation.
 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

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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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