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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Enhancement of the lean stability and blow-off limits of methane-air swirl flames at elevated pressures by nanosecond repetitively pulsed discharges
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Enhancement of the lean stability and blow-off limits of methane-air swirl flames at elevated pressures by nanosecond repetitively pulsed discharges

机译：通过纳秒重复脉冲放电提高甲烷 - 空气旋流火焰的瘦稳定性和吹扫限制

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摘要

This paper examines the ability of nanosecond repetitively pulsed (NRP) plasma discharges to improve stabilization and extend the blow-off limit of lean premixed methane-air swirl flames at pressures up to 5 bar. The effect of two discharge regimes, NRP glows and NRP sparks, was investigated. The electrical characterization of the discharges was performed and direct images at 60 Hz of the flames, with and without NRP discharges, were collected to assess the effect of the discharges on flame stabilization. Results showed that NRP discharges efficiently extended the lean blow-off and stability limits of premixed methane-air swirl flames, at pressures up to 5 bar. These results were obtained for a ratio of NRP discharge power to flame thermal power of 0.7% or less. Moreover, the peak voltage necessary to maintain constant this power ratio did not increase linearly with increased pressure, even though the reduced electric field should linearly decrease with the pressure. It was also observed that the relative effectiveness of the NRP glows and NRP sparks changed by increasing the pressure. Based on discharge physics and current knowledge of the effect of pressure on the electrical properties of flames, explanations for these results are proposed.
机译：本文研究了纳秒重复脉冲（NRP）等离子体放电以改善稳定化的能力，并延长高达5巴的压力下精液预混甲烷 - 空气旋流火焰的吹扫极限。研究了两次排放制度，NRP发光和NRP火花的影响。收集排出的电学表征并在60Hz的60Hz处直接图像，并且没有NRP放电，以评估排出对火焰稳定的影响。结果表明，NRP在高达5巴的压力下有效地延长了预混合的甲烷 - 空气旋流火焰的贫吹灰和稳定性限制。获得这些结果的NRP放电功率与火焰热功率的比率为0.7％或更低。此外，保持恒定的峰值电压该功率比在增加的压力下，该功率比不会线性增加，即使减小的电场应随压力线性降低。还观察到，通过增加压力，NRP发光和NRP火花的相对有效性。基于放电物理和目前对压力对火焰电性能的影响，提出了对这些结果的说明。

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