Effect of AC Electric Field on Combustion Characteristics of Methane/Air Premixed Spherical Flame at High Initial Pressure

被引：0

作者：

Du Z. ^{[1
]}

Gao Z. ^{[1
]}

He Z. ^{[1
]}

Zhang H. ^{[1
]}

Lu J. ^{[1
]}

Guo Z. ^{[1
]}

Bao Y. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2020年 / 54卷 / 03期

关键词：

Bi-ionic wind effect; Combustion characteristics; Electric field-assisted combustion; Electrochemical effect;

D O I：

10.7652/xjtuxb202003010

中图分类号：

学科分类号：

摘要：

To study the effect of applying AC electric field on the natural gas premixed flame at high initial pressures, we used a volume-constant combustion chamber, and the research object was a transient spherical flame of methane/air premixture, aiming at exploring the effects of low-frequency AC electric field and high-frequency AC electric field loaded with an effective voltage 5 kV on the combustion characteristics of methane/air premixed flames in the condition that excess air coefficient λ=1.2, temperature T=298 K and initial pressure p=300 kPa. The results showed that, under low frequency conditions, when the electric field frequency f=40, 60, 80, 100 Hz, the flame propagation speeds increased by 17.41%, 6.53%, 3.99% and 1.54%; the flame combustion pressure peak increased by 2.06%, 1.73%, 1.04% and 0.79%; the time for the mass burning rate reaching 100% shortened by 11.96%, 10.27%, 7.78% and 3.74%, respectively. Under high frequency conditions, when the electric field frequency f=10, 15, 20 kHz, the flame propagation speeds increased by 13.69%, 19.76% and 22.21%; the flame combustion pressure peak increased by 1.00%, 2.37%, and 3.07%; the time for the mass burning rate reaching 100% shortened by 11.03%, 14.94% and 16.13%, respectively. Finally, the combustion-supporting mechanisms, i.e., the bi-ionic wind effect for low-frequency AC electric field and the electrochemical effect for high-frequency AC electric field, are analyzed and explained, and the results are in accordance with experiments, verifying the feasibility and effectiveness of the electric field-assisted combustion technology. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

引用

页码：80 / 87and96

页数：8716

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