Electric field effects in the presence of chemi-ionization on droplet burning

被引:14
作者
Patyal, Advitya [1 ]
Kyritsis, Dimitrios [2 ]
Matalon, Moshe [1 ]
机构
[1] Univ Illinois, Urbana, IL 61801 USA
[2] Khalifa Univ, Abu Dhabi, U Arab Emirates
关键词
Chemi-ionization; Electric field; Ohmic heating; Ionic wind; Droplet combustion; Diffusion flame; DETAILED ION CHEMISTRY; METHANE-OXYGEN FLAMES; DIFFUSION; COMBUSTION; SIMULATION;
D O I
10.1016/j.combustflame.2015.11.005
中图分类号
O414.1 [热力学];
学科分类号
摘要
The effects of an externally applied electric field on the burning characteristics of a spherically symmetric fuel drop, including the flame structure, flame standoff distance, mass burning rate and flame extinction characteristics of the diffusion flame are studied. A reduced three-step chemical kinetic mechanism that reflects the chemi-ionization process for general hydrocarbon fuels has been proposed to capture the production and destruction of ions inside the flame zone. Due to the imposed symmetry, the effect of the ionic wind is simply to modify the pressure field. Our study thus focuses exclusively on the effects of Ohmic heating and kinetic effects on the burning process. Two distinguished limits of weak and strong field are identified, highlighting the relative strength of the internal charge barrier compared to the externally applied field. For both limits, significantly different charged species distributions are observed. An increase in the mass burning rate is noticed with increasing the strength of the electric field in both limits, with a small change in flame temperature. Increasing external voltages pushes the flame away from the droplet and causes a strengthening of the flame with a reduction in the extinction Damkholer number. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:99 / 110
页数:12
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