Detection of Nickel Atoms Released from Electrodes in Spark Discharges Using Laser-Induced Fluorescence.

IF 2.2 3区 化学 Q2 INSTRUMENTS & INSTRUMENTATION Applied Spectroscopy Pub Date : 2024-09-28 DOI:10.1177/00037028241285150
Kailun Zhang, Ruike Bi, Johan Tidholm, Jakob Ängeby, Mattias Richter, Andreas Ehn
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Abstract

The reduction of greenhouse gas emissions and the effort of carbon neutrality require the improvement of spark-ignition engines in terms of efficiency and capability to operate on renewable fuels. The electrode wear of spark plugs, used for ignition of novel fuels and lean mixtures, emerges as a significant challenge in this transition. Understanding the physical mechanism and influence of spark operation parameters of the wear process is thus important. Compared to the conventional methodology of performing long-term wear tests, laser-based optical diagnostics methods are capable of assessing electrode wear during one single or a few spark discharges. In this work, the necessary initial steps required for performing optical investigations using laser-induced fluorescence (LIF) are presented. Several excitation pathways of nickel atoms were investigated, and 336.96 nm was identified as the optimal one. This excitation approach yielded emissions between 338.75 and 353.58 nm, effectively avoiding the major interference from N2 plasma emission in spark discharges. Additionally, a linear relationship in fluorescence signal intensity with excitation energy up to 400 µJ was observed. These findings indicate the potential of LIF for in situ diagnostics of electrode wear, contributing to engine development in both efficiency and compatibility with sustainable fuels.

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利用激光诱导荧光检测火花放电中电极释放的镍原子
要减少温室气体排放和实现碳中和,就必须提高火花点火发动机的效率和使用可再生燃料的能力。用于点燃新型燃料和贫油混合物的火花塞的电极磨损是这一转变过程中面临的重大挑战。因此,了解磨损过程的物理机制和火花操作参数的影响非常重要。与进行长期磨损测试的传统方法相比,基于激光的光学诊断方法能够评估一次或几次火花放电过程中的电极磨损情况。本文介绍了利用激光诱导荧光(LIF)进行光学研究的必要初始步骤。对镍原子的几种激发途径进行了研究,最终确定 336.96 nm 为最佳激发途径。这种激发方法可产生 338.75 和 353.58 纳米之间的发射,有效避免了火花放电中 N2 等离子体发射的主要干扰。此外,还观察到荧光信号强度与高达 400 µJ 的激发能量呈线性关系。这些研究结果表明了 LIF 在现场诊断电极磨损方面的潜力,有助于提高发动机的效率和与可持续燃料的兼容性。
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来源期刊
Applied Spectroscopy
Applied Spectroscopy 工程技术-光谱学
CiteScore
6.60
自引率
5.70%
发文量
139
审稿时长
3.5 months
期刊介绍: Applied Spectroscopy is one of the world''s leading spectroscopy journals, publishing high-quality peer-reviewed articles, both fundamental and applied, covering all aspects of spectroscopy. Established in 1951, the journal is owned by the Society for Applied Spectroscopy and is published monthly. The journal is dedicated to fulfilling the mission of the Society to “…advance and disseminate knowledge and information concerning the art and science of spectroscopy and other allied sciences.”
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