Effects of DC electric field on spherical expansion flame under different initial pressures

被引：0

作者：

Lu J. ^{[1
]}

Gao Z. ^{[1
]}

机构：

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

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 10期

基金：

中央高校基本科研业务费专项资金资助;

关键词：

Developing degree of negative ionic wind; Electric body force; Ionic wind effect; Positive DC electric field; Spherical expansion flame;

D O I：

10.11817/j.issn.1672-7207.2020.10.027

中图分类号：

学科分类号：

摘要：

To investigate the affecting mechanism of DC electric field on combustion under different pressures, experiments were conducted under the condition of normal temperature and initial pressure of 0.1-0.5 MPa, and the combustion characteristics of methane/air spherical expansion flame in the DC electric field were studied in a constant-volume combustion bomb. The effects of DC electric field on flame propagation speed and combustion pressure were analyzed under different initial pressures. The results show that the flame is mainly stretched in the horizontal direction with the electric field. And the flame propagation velocity, pressure peak and flame surface wrinkle coefficient all increase with the increase of the loading voltage. This phenomenon is more obvious and flame instability is obviously enhanced under high initial pressure. The electric body force increases gradually with the increase of voltage, and the flame propagation velocity increase rate and pressure peak increase rate are closely related to the electric body force. The correlation coefficients between linear fitting of flame propagation velocity rate, the pressure peak increase rate, the flame surface wrinkle coefficient and the negative ionic wind development degree ξ are 0.992, 0.991 and 0.991, respectively. It is indicated that the positive electric field has different effects on the flame due to the difference of ξ. © 2020, Central South University Press. All right reserved.

引用

页码：2959 / 2968

页数：9

共 25 条

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