Fach, Christian ; Rödel, Nico ; Schorr, Jürgen ; Krüger, Christian ; Dreizler, Andreas ; Böhm, Benjamin (2023)
Multi-parameter imaging of in-cylinder processes during transient engine operation for the investigation of soot formation.
In: International Journal of Engine Research, 2022, 23 (9)
doi: 10.26083/tuprints-00022025
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
Transient engine operation of direct-injection spark ignition engines can result in high particulate number emissions. To investigate the causes of soot formation, an engine test rig was developed to perform detailed measurements of real transient operation. For this purpose, a single-cylinder full-metal engine with a real combustion chamber geometry was equipped with minimally invasive optical accesses. Simultaneous high-speed endoscopic PIV, spray visualization, and combustion imaging were applied to investigate the in-cylinder processes in detail. Endoscopic PIV was first compared in the central symmetry plane with classical PIV performed at the equivalent optical engine at steady-state operation for verification. Then the engine parameters of a tip-in performed by the corresponding four-cylinder engine, which led to high particle number emissions, were applied to the single-cylinder engine. The engine parameters were in a good agreement and particle number emissions due to the maneuver were within the same range of several 10⁶ #/cm³. In total, 19 repetitions of the tip-in maneuver were analyzed with respect to the in-cylinder processes and repeatability of engine parameters. Furthermore, the in-cylinder flow field during the late compression stroke, flame propagation, and soot luminosity of single cycles during the tip-in indicated cause-and-effect chains for the formation of pool fire and soot at the injector tip. The direction of the flow below the spark plug influenced the direction of flame propagation. An early arrival of the flame enhanced the formation of soot from fuel films formed on the piston surface or at the injector. In engine applications, counter measures can be applied to reduce the particle number emissions when accounting for these indicated cause-and-effect chains.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Fach, Christian ; Rödel, Nico ; Schorr, Jürgen ; Krüger, Christian ; Dreizler, Andreas ; Böhm, Benjamin |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Multi-parameter imaging of in-cylinder processes during transient engine operation for the investigation of soot formation |
| Sprache: | Englisch |
| Publikationsjahr: | 28 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | September 2022 |
| Ort der Erstveröffentlichung: | London |
| Verlag: | SAGE Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | International Journal of Engine Research |
| Jahrgang/Volume einer Zeitschrift: | 23 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.26083/tuprints-00022025 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/22025 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | Transient engine operation of direct-injection spark ignition engines can result in high particulate number emissions. To investigate the causes of soot formation, an engine test rig was developed to perform detailed measurements of real transient operation. For this purpose, a single-cylinder full-metal engine with a real combustion chamber geometry was equipped with minimally invasive optical accesses. Simultaneous high-speed endoscopic PIV, spray visualization, and combustion imaging were applied to investigate the in-cylinder processes in detail. Endoscopic PIV was first compared in the central symmetry plane with classical PIV performed at the equivalent optical engine at steady-state operation for verification. Then the engine parameters of a tip-in performed by the corresponding four-cylinder engine, which led to high particle number emissions, were applied to the single-cylinder engine. The engine parameters were in a good agreement and particle number emissions due to the maneuver were within the same range of several 10⁶ #/cm³. In total, 19 repetitions of the tip-in maneuver were analyzed with respect to the in-cylinder processes and repeatability of engine parameters. Furthermore, the in-cylinder flow field during the late compression stroke, flame propagation, and soot luminosity of single cycles during the tip-in indicated cause-and-effect chains for the formation of pool fire and soot at the injector tip. The direction of the flow below the spark plug influenced the direction of flame propagation. An early arrival of the flame enhanced the formation of soot from fuel films formed on the piston surface or at the injector. In engine applications, counter measures can be applied to reduce the particle number emissions when accounting for these indicated cause-and-effect chains. |
| Freie Schlagworte: | High-speed particle image velocimetry, spray visualization, flame propagation, soot formation, endoscopic, internal combustion engine, transient engine operation |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-220253 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Reaktive Strömungen und Messtechnik (RSM) |
| Hinterlegungsdatum: | 28 Nov 2023 10:36 |
| Letzte Änderung: | 29 Nov 2023 06:21 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Multi-parameter imaging of in-cylinder processes during transient engine operation for the investigation of soot formation. (deposited 28 Nov 2023 10:36) [Gegenwärtig angezeigt]
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