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| Effects of HighFrequency Alternating Electric Fields of Different Frequencies on Spherical Propagation Flame |
| CUI Yuchen1,GAO Zhongquan1,DUAN Hao1,ZHANG Cong1,WU Xiaomin1,2
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| (1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China；
2. Shaanxi University of Technology, Hanzhong 723001, Shaanxi, China) |
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Abstract Abstract： An experiment was conducted under a lean combustion condition to investigate the influences of highfrequency 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 highfrequency 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 highfrequency alternating electric fields are beneficial to the flame combustion and as the frequency increases, the promoting effect also increase.
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Received: 03 March 2015
Published: 28 April 2016
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