CAJ | 학술논문

对常温、常压下定容燃烧弹中的甲烷/空气预混贫燃火焰的传播和燃烧特性进行了研究，对比了相同电压有效值下15 kHz高频交流电压和直流电压对火焰的影响。结果表明：两种电压加载方式下，火焰形状均发生变形，当过量空气系数一定时，交流电场作用下的火焰在水平方向上的拉伸比直流电场下的剧烈，且混合气越稀，两者差异越明显；与未加载电压相比，当过量空气系数为1.2、1.4和1.6时，交流电场作用下的平均火焰传播速度分别提高49.14%、76.54%、117.65%，直流电场下分别提高41.38%、58.02%、62.75%，交流电场下压力峰值增幅分别为9.48%、11.48%、14.20%，直流电场下增幅分别为4.46%、5.25%、8.76%。因此，相同电压有效值下，15 kHz高频交流电场对火焰的促进作用较直流电场更明显。
대상온、상압하정용연소탄중적갑완/공기예혼빈연화염적전파화연소특성진행료연구，대비료상동전압유효치하15 kHz고빈교류전압화직류전압대화염적영향。결과표명：량충전압가재방식하，화염형상균발생변형，당과량공기계수일정시，교류전장작용하적화염재수평방향상적랍신비직류전장하적극렬，차혼합기월희，량자차이월명현；여미가재전압상비，당과량공기계수위1.2、1.4화1.6시，교류전장작용하적평균화염전파속도분별제고49.14%、76.54%、117.65%，직류전장하분별제고41.38%、58.02%、62.75%，교류전장하압력봉치증폭분별위9.48%、11.48%、14.20%，직류전장하증폭분별위4.46%、5.25%、8.76%。인차，상동전압유효치하，15 kHz고빈교류전장대화염적촉진작용교직류전장경명현。
The lean combustion experiments of natural gas and air mixture were conducted to investigate the influences of electric fields generated by alternating current (AC) at the frequency of 15 kHz and direct current (DC) with the same voltage virtual value on the flame propagation and combustion characteristics of premixed CH4/air mixtures at room temperature and atmospheric pressure. The results show that the flame shape deforms when the two kinds of voltages are applied to the mesh electrodes. The flame is stretched more severely in the horizontal for AC than for DC at the same excess air ratio,especially when concentration of natural gas is diluted by excess air. When excess air ratios are 1.2,1.4 and 1.6, average flame propagation speeds increase up to 49.14%,76.54%and 117.65%for AC, and 41.38%,58.02%and 62.75%for DC, and peak values of pressure rise up to 9.48%,11.48%and 14.20%for AC and 4.46%,5.25%and 8.76%for DC,respectively, compared with those without added voltage. These results indicate that promoting performance for development of combustion flame is better for frequency 15 kHz AC than for DC at the same voltage virtual value.