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학술대회자료
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2009년도 열공학부문 춘계학술대회 논문집
발행연도
2009.5
수록면
336 - 341 (6page)

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The effects of acoustic excitation on the reduction in nitric oxidant (NOx) emission were experimentally investigated in non-premixed lifted hydrogen jet flames with coaxial air. The purpose of this work was to find an effective method to reduce NOx emission, to analyse the acoustic forcing effect on the flow field, the reaction zone, and NOx emission, and to study NOx reduction mechanisms. For the analysis of the flow field, a PIV method was used that incorporated two Nd-YAG lasers and a CCD camera. The reaction zone was visualized by taking OH<SUP>*</SUP> chemiluminescence images with a 307.1±5 ㎚ narrow band pass filter and an ICCD camera. A flow condition was carefully selected at uF=200 ㎧ and uA=16 ㎧, which was sustainable for the acoustic excitation in a lifted flame region. The frequency was swept from 150 to 1000 ㎐ in 5 ㎐ steps. And then NOx emissions were detected with a NOx sensor and recorded in a DAQ system. From the measurements of the flow field, the reaction zone, and NOx emission, we concluded that NOx emission was reduced and minimized at a resonance frequency. The vortex that was generated by acoustic forcing promoted air entrainment and enhanced fuel-air premixing. This premixing effect resulted in a lower flame temperature, and thus, a lower NOx emission.

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