Single- and dual-channel nanosecond repetitively pulsed discharges at small and large spark gaps for turbulent premixed spherical flame initiation

Tinh, Van; Shy, S.S.; Chen, Y.R.

doi:10.1016/j.proci.2022.08.078

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…7,8,10,[12][13][14] Optical techniques have also been expanded to engine-like compression and expansion machines to investigate the temperature of the spark discharge and early flame kernel using measured emission spectra 15 or to measure the effect of varying the discharge current and the in-cylinder flow on the ignition and early flame. 16 In addition, advanced ignition strategies, such as using nanosecond-pulsed high-frequency discharges 17 or single-and dual-channel nanosecond-discharge, 18 have been employed to enhance the stability and reliability of the ignition process.…”

Section: Introductionmentioning

confidence: 99%

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

Welch,

Illmann,

Schmidt

et al. 2023

International Journal of Engine Research

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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.

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