Laminar Flame Premixed Combustion Characteristics of Ethanol-Isooctane Blends at Elevated Temperatures

被引：0

作者：

Zhang Y. ^{[1
]}

Li Q. ^{[1
]}

Yan Z. ^{[1
]}

Huang Z. ^{[1
]}

机构：

[1] State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2018年 / 52卷 / 07期

关键词：

Chemical kinetics; Isooctane-ethanol blended fuel; Laminar flame speed;

D O I：

10.7652/xjtuxb201807011

中图分类号：

学科分类号：

摘要：

The laminar flame speeds of isooctane/ethanol/air mixtures were measured with the outwardly expanded spherical flame and high-speed schlieren photography over a wide range of ethanol blending ratios (0, 0.2, 0.4, 0.6, 0.8, 1.0) at two initial pressures (0.1, 0.5 MPa) and elevated initial temperature(433 K). Nonlinear methodology was employed to remove the stretch effect in the data processing. Results at three equivalent ratios showed that the laminar flame speeds of the blends significantly increase with the decrease of initial pressure and slightly increase with blending ratio of ethanol. The effect of blending ratio on the laminar flame speed of the mixtures was explained through one-step total reaction hypothesis theory. The overall activation energy was obtained by calculating the parameters regarding the thermodynamics and transport behaviors, and the chemical kinetics was found to dominate the laminar flame speed variation. The experimental data were adopted to validate two models and the Dagaut model yielded better prediction on our experimental results. Finally, the effect of ethanol addition was explained through the analysis on the reaction pathway and flame structure, revealing that ethanol substitution is the intrinsic cause leading to the variation of laminar flame speeds. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

引用

页码：74 / 79

页数：5

共 10 条

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