Enhancement of lean blowout limits of swirl stabilized NH3-CH4-Air flames using nanosecond repetitively pulsed discharges at elevated pressures

IF 5 Q2 ENERGY & FUELS Applications in Energy and Combustion Science Pub Date : 2023-11-14 DOI:10.1016/j.jaecs.2023.100225

B Aravind, Liang Yu, Deanna Lacoste

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Abstract

This study experimentally examines the impact of nanosecond repetitively pulsed (NRP) discharges on lean premixed methane-ammonia-air swirl flames at pressures up to 4 bar. The results reveal the extension of flame blowout limit by 10–12 % under atmospheric conditions and 5–6 % at 4 bar, when NRP discharges are applied. This decrease in the plasma effect could be attributed to the detrimental impact of strong shock waves at high pressure, destabilizing the flame. NH₃-CH₄-air flames shows higher lean blowout limits in comparison to CH₄-air flames. NRP discharges exhibit consistent impact on the lean blowout limit enhancement across ammonia fractions (20–60 %), irrespective of pressure conditions. These results are obtained for a ratio of NRP discharge power to flame thermal power of 0.63 % and constant pulse repetition frequency of 30 kHz.

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利用纳秒重复脉冲放电在高压下提高旋流稳定nh3 - ch4空气火焰的贫爆极限

本研究通过实验研究了纳秒重复脉冲(NRP)放电对压力高达4 bar的贫预混甲烷-氨-空气漩涡火焰的影响。结果表明，在常压条件下，火焰喷灭扩展10 -12%，在4 bar条件下，NRP放电扩展5-6%。等离子体效应的减少可以归因于高压下强冲击波的有害影响，使火焰不稳定。nh3 - ch4 -空气火焰比ch4 -空气火焰有更高的倾爆极限。无论压力条件如何，NRP排放对氨馏分(20-60%)的稀薄井喷极限提高都有一致的影响。这些结果是在NRP放电功率与火焰热功率之比为0.63%，脉冲重复频率恒定为30 kHz的条件下得到的。

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来源期刊

Applications in Energy and Combustion Science

CiteScore

4.20

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