Effects of HighFrequency Alternating Electric Fields of Different Frequencies on Spherical Propagation Flame

Abstract

Abstract: Abstract： An experiment was conducted under a lean combustion condition to investigate the influences of highfrequency alternating electric fields of different frequencies on the flame propagation and combustion characteristics of premixed CH4/air mixtures at an excess air ratio of 1.6, room temperature and atmospheric pressure. The results show that the flame is stretched horizontally when a highfrequency alternating electric field is applied to the electrodes. When the voltage virtual value is invariable, the flame stretches more severely with the frequency increasing. Compared with those without the applied voltage, when the voltage virtual value is 5 kV and the frequencies are 5, 7.5, 10, 12.5 and 15 kHz, the average flame propagation speed increases by 43.10%, 53.45%, 63.79%, 74.14% and 84.48%. The maxima of the increase rate of relative combustion pressure are 0.15, 0.21, 0.27, 0.36 and 0.50, respectively. These results indicate that highfrequency alternating electric fields are beneficial to the flame combustion and as the frequency increases, the promoting effect also increase.

Key words: Key words： highfrequency alternating electric field, frequency, constant volume combustion bomb, premixed lean combustion, flame propagation characteristics

CLC Number:

TK 431

CUI Yuchen1,GAO Zhongquan1,DUAN Hao1,ZHANG Cong1,WU Xiaomin1,2. Effects of HighFrequency Alternating Electric Fields of Different Frequencies on Spherical Propagation Flame[J]. Journal of Shanghai Jiaotong University, 2016, 50(04): 490-495.

References

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