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Experimental evaluation of spark behavior under diluted conditions in an optically accessible engine

Welch, Cooper ; Illmann, Lars ; Schmidt, Marius ; Dreizler, Andreas ; Böhm, Benjamin (2023)
Experimental evaluation of spark behavior under diluted conditions in an optically accessible engine.
In: International Journal of Engine Research
doi: 10.1177/14680874231197492
Article, Bibliographie

Abstract

An optically accessible single-cylinder spark-ignition engine operated under homogeneous, part-load conditions is experimentally investigated using optical and spark diagnostics to evaluate the relationship between the spark, flow, and flame with increasing dilution using several levels of exhaust gas recirculation (EGR). Voltage and current measurements of the secondary spark circuit are compared with simultaneous high-speed spark plasma imaging, particle image velocimetry measurements of the flow field, and burned gas images. Specifically, characteristic restrike cycles and normal cycles are examined under the 0% EGR and 12:9% EGR conditions to reveal a relationship between the magnitude and direction of the velocity near the spark plug and the spark’s behavior coupled with that of the subsequent flame propagation. Through the use of conditional statistics and correlation analysis of data sets of all non-restrike and all restrike cycles, the horizontal velocity across the spark gap was identified as a critical quantity in facilitating more stable and faster combustion under diluted mixture conditions.

Item Type: Article
Erschienen: 2023
Creators: Welch, Cooper ; Illmann, Lars ; Schmidt, Marius ; Dreizler, Andreas ; Böhm, Benjamin
Type of entry: Bibliographie
Title: Experimental evaluation of spark behavior under diluted conditions in an optically accessible engine
Language: English
Date: 10 August 2023
Publisher: Sage Publications
Journal or Publication Title: International Journal of Engine Research
DOI: 10.1177/14680874231197492
URL / URN: https://journals.sagepub.com/doi/10.1177/14680874231197492
Abstract:

An optically accessible single-cylinder spark-ignition engine operated under homogeneous, part-load conditions is experimentally investigated using optical and spark diagnostics to evaluate the relationship between the spark, flow, and flame with increasing dilution using several levels of exhaust gas recirculation (EGR). Voltage and current measurements of the secondary spark circuit are compared with simultaneous high-speed spark plasma imaging, particle image velocimetry measurements of the flow field, and burned gas images. Specifically, characteristic restrike cycles and normal cycles are examined under the 0% EGR and 12:9% EGR conditions to reveal a relationship between the magnitude and direction of the velocity near the spark plug and the spark’s behavior coupled with that of the subsequent flame propagation. Through the use of conditional statistics and correlation analysis of data sets of all non-restrike and all restrike cycles, the horizontal velocity across the spark gap was identified as a critical quantity in facilitating more stable and faster combustion under diluted mixture conditions.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
Date Deposited: 11 Dec 2023 07:44
Last Modified: 11 Dec 2023 07:44
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