化工学报 ›› 2018, Vol. 69 ›› Issue (12): 5229-5236.DOI: 10.11949/j.issn.0438-1157.20180059

• 能源和环境工程 • 上一篇    下一篇

不同CO2浓度下负直流电场对C3H8/O2/Ar/CO2预混火焰的影响规律

孟祥文1, 李震1, 唐元政1, 何燕1, 吴筱敏2   

  1. 1. 青岛科技大学机电工程学院, 山东 青岛 266061;
    2. 西安交通大学能源与动力工程学院, 陕西 西安 710049
  • 收稿日期:2018-01-15 修回日期:2018-09-20 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: 孟祥文
  • 基金资助:

    山东省自然科学基金项目(ZR2014EEP010);国家自然科学基金项目(51476126);青岛科技大学科研启动基金项目。

Effects of negative electric field on C3H8/O2/Ar/CO2 flame characteristics under different CO2 blending concentrations

MENG Xiangwen1, LI Zhen1, TANG Yuanzheng1, HE Yan1, WU Xiaomin2   

  1. 1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China;
    2. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
  • Received:2018-01-15 Revised:2018-09-20 Online:2018-12-05 Published:2018-12-05
  • Supported by:

    supported by the Natural Science Foundation of Shandong Province (ZR2014EEP010) and the National Natural Science Foundation of China (51476126).

摘要:

为了揭示电场对火焰效应与火焰传播速率的关系,在定容燃烧弹上研究了常温常压下、负直流电场(U=0、-5、-10 kV)对当量燃空比f为1.0的C3H8/O2/Ar/CO2预混火焰影响规律随混合气中CO2掺混浓度(混合气中CO2体积分数分别为0、10%、15%、20%)的变化关系。实验结果表明:给定加载电压,随着CO2掺混浓度的增大,C3H8/O2/Ar/CO2预混火焰传播速率降低,规范化火焰变形率与平均火焰传播速率变化率均增大。当U=-10 kV时,CO2掺混浓度为0、10%、15%、20%时对应的平均火焰变形率分别为1.01、1.31、1.80、3.12,平均火焰传播速度变化率分别为10.87%、17.87%、19.16%和34.63%。研究结果表明负直流电场对C3H8/O2/Ar/CO2火焰传播的促进效应随着火焰传播速率的降低而显著增强。

关键词: CO2掺混浓度, 直流电场, 预混火焰, 变形率, 火焰传播速率

Abstract:

To study the influence of the flame propagation speed on the electric field-flame effects, an experiment was conducted on the constant volume combustion bomb to investigate the effects of negative direct current electric field(U=0, -5, -10 kV) on the C3H8/O2/Ar/CO2 premixed flame with the different CO2 blending concentrations at equivalent fuel/air ratio of 1.0, room temperature and atmospheric pressure. The CO2 blending concentrations are 0, 10%, 15%, and 20%, respectively. Given applied electric field and mixture concentration, the flame propagation speed of C3H8/O2/Ar/CO2 flame decreases with the CO2 blending concentrations increasing, while both the normalized flame deformation ratio and the mean change rate of the flame propagation speed increase. When U=-10 kV and C3H8/O2/Ar/CO2 flames with the CO2 blending concentrations of 0, 10%, 15%, and 20%, the mean normalized flame deformation ratios are 1.01, 1.31, 1.80, and 3.12, respectively. The mean change rate of the flame propagation speeds are 10.87%, 17.87%, 19.16%, and 34.63%, respectively. The results show that the promoting effect of negative DC electric field on C3H8/O2/Ar/CO2 flame propagation is significantly enhanced with the decrease of flame propagation rate.

Key words: CO2 blending concentration, direct current electric field, premixed flame, deformation ratio, flame propagation speed

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