Experimental study of lube oil pre-ignition in an optical gas engine test rig
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Publication date
18.01.2024
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01A - Journal article
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International Journal of Engine Research
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25
Issue / Number
5
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SAGE
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Abstract
Lean-premixed gas combustion is an attractive option for meeting future emission standards toward considerably lower particulate matter and emissions while obtaining an efficiency comparable to diesel combustion. However, ignition processes still pose considerable challenges, with pre-ignition being a major issue. The pre-ignition phenomenon might result from the self-ignition of lube oil in hot zones, making it challenging to observe in real engines. To study single or sparsely separated lube oil droplets under engine-like conditions, the “Flex-OeCoS” experimental test facility was used. To be able to induce such pre-ignitions artificially a novel piezo droplet injector was developed and manufactured, which enabled the metering of minor amounts of lubricating oil or even the injection of single droplets. High-speed cameras and specially developed and partially automatable and adaptive evaluation algorithms were used to record and track the behavior of the injected droplet using overlaid schlieren and OH* chemiluminescence. During the measurement campaigns, relevant operating parameters were varied, and optical investigations were carried out with an ignitable mixture on the Flex-OeCoS test facility under engine-relevant operating conditions. Spontaneous ignition of the vaporized lubricating oil was observed, which subsequently led to ignition of the whole air-fuel mixture in the optical combustion chamber. This was especially evident for lean methane-air mixtures up to an air-fuel ratio of 2.0. With this approach, information could be gathered about the necessary internal engine conditions that lead to pre-ignition in lean mixtures and where their limits lie.
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1468-0874
2041-3149
2041-3149
Language
English
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Yes
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Published
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Peer review of the complete publication
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Closed
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Citation
Vera-Tudela, W., Süess, P., Albrecht, P., Wüthrich, S., & Herrmann, K. (2024). Experimental study of lube oil pre-ignition in an optical gas engine test rig. International Journal of Engine Research, 25(5). https://doi.org/10.1177/14680874231221847