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<p>This study examines the combined influence of non-thermal plasma (NTP) activation and hydrogen blending (<i>Ω</i><sub>H2</sub> = 0–0.2) on lean blowout (LBO) limits and pollutant emissions in turbulent CH<sub>4</sub>/air premixed flames stabilized in a swirl combustor. Hydrogen blending enhances chemical reactivity and extends the LBO limit, whereas applying NTP under optimized discharge conditions (7 kV, 4 kHz) further extended the LBO limit through direct streamer-flame interaction and indirect stabilization mediated by ozone formation and ionic-wind effects. Applying NTP markedly reduced CO emissions by improving combustion performance, while NOX exhibited only a slight increase and remained within acceptable low-emission limits. These results demonstrate that hydrogen blending combined with applying NTP provides an effective route toward lean, low-emission combustion.</p>

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Effects of nonthermal plasma and hydrogen blending on lean blowout limit and CO/NOX emissions for turbulent CH4/air premixed flames in a swirled combustor

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Sung Jong Kang,
  • Chun Sang Yoo,
  • Jeong Park,
  • Suk Ho Chung

摘要

This study examines the combined influence of non-thermal plasma (NTP) activation and hydrogen blending (ΩH2 = 0–0.2) on lean blowout (LBO) limits and pollutant emissions in turbulent CH4/air premixed flames stabilized in a swirl combustor. Hydrogen blending enhances chemical reactivity and extends the LBO limit, whereas applying NTP under optimized discharge conditions (7 kV, 4 kHz) further extended the LBO limit through direct streamer-flame interaction and indirect stabilization mediated by ozone formation and ionic-wind effects. Applying NTP markedly reduced CO emissions by improving combustion performance, while NOX exhibited only a slight increase and remained within acceptable low-emission limits. These results demonstrate that hydrogen blending combined with applying NTP provides an effective route toward lean, low-emission combustion.