전기장 인가에 따른 층류 예혼합 화염의 열-음향 불안정성 변화
The Effect of Electric Field on Thermo-Acoustic Instability in a Laminar Premixed Flame
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In this study, the effect of an electric field on thermo-acoustic instability in a laminar premixed flame was investigated. Flame surface fluctuations and sound pressure were measured using a high-speed camera and a microphone. The results showed that the flame surface oscillated under the no-voltage condition, with these oscillations intensifying under –3 kV and decreasing under +3 kV. This behavior remained consistent even as the inlet velocity increased. In the frequency domain, applying –3 kV shifted the dominant frequency to a higher range, whereas no distinct peak was observed under the +3 kV condition. Regarding the sound pressure level, –3 kV had little impact, whereas +3 kV reduced it by up to 23.8% under stoichiometric conditions. Furthermore, this effect remained effective even under lean premixed conditions.
Abstract
In this study, the effect of an electric field on thermo-acoustic instability in a laminar premixed flame was investigated. Flame surface fluctuations and sound pressure were measured using a high-speed camera and a microphone. The results showed that the flame surface oscillated under the no-voltage condition, with these oscillations intensifying under –3 kV and decreasing under +3 kV. This behavior remained consistent even as the inlet velocity increased. In the frequency domain, applying –3 kV shifted the dominant frequency to a higher range, whereas no distinct peak was observed under the +3 kV condition. Regarding the sound pressure level, –3 kV had little impact, whereas +3 kV reduced it by up to 23.8% under stoichiometric conditions. Furthermore, this effect remained effective even under lean premixed conditions.