Effects of low-frequency and high-frequency alternating electric fields on spherical expansion flame

被引：0
|
作者：
Cui Y.-C. [1 ]
Li C. [1 ]
Gao Z.-Q. [1 ]
Wu X.-M. [1 ,2 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] Shaanxi University of Technology, Hanzhong
来源：
Tuijin Jishu | / 5卷 / 807-814期
关键词：
Alternating electric field; Combustion pressure; Flame propagation speed; Frequency; Lean combustion; Spherical expansion flame;
D O I：
10.13675/j.cnki.tjjs.2016.05.002
中图分类号：
学科分类号：
摘要：
The effects of alternating electric fields on premixed lean CH4/air mixtures were studied in a constant volume bomb to compare the roles of different frequencies of low-frequency and high-frequency alternating electric fields in promoting combustion process, and the different effects of low-frequency and high-frequency alternating electric fields on flame propagation speed and combustion pressure were analyzed. The results show that the flame is stretched in the horizontal when alternating electric field is applied to the electrodes and the stretching amplitude varies with frequency. The average flame propagation speed and combustion pressure increase as the frequency decreases under low-frequency alternating electric fields, while the scenario is completely opposite under high-frequency alternating electric fields. Compared with those without the applied voltage, when the voltage virtual value is 5kV and the frequencies are 40 Hz, 60 Hz, 80 Hz, 100 Hz, 10 kHz, 15 kHz, 20 kHz and 25 kHz, the average flame propagation speed at the excess air ratio of 1.6 increase by 72.41%, 55.17%, 48.28%, 39.66%, 62.07%, 70.69%, 81.03% and 87.93%, the maxima of the increasing rate of relative combustion pressure are 0.65, 0.58, 0.48, 0.28, 0.29, 0.51, 0.67 and 0.86, respectively. These results indicate that high-frequency alternating electric fields perform better than low-frequency alternating electric fields in promoting combustion process. © 2016, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：807 / 814
页数：7
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