Effects of electric field waveforms on a lifted non-premixed jet flame

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-07-18 DOI:10.1016/j.expthermflusci.2024.111271
Wei-Lun Guan , Chiang Fu , Jun-Lin Chen , Ying-Hao Liao
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Abstract

This study systematically investigates the behavior of lifted non-premixed jet flame under the influence of various electric field waveforms. In our experimental setup, high voltage is applied to the fuel nozzle, which acts as an electrode, while the flame serves as a floating electrode. The primary areas of interest are the responses of flame lift-off height, flame lift-off velocity, ion current and flow structure to electric fields. Results reveal that the flame lift-off height is predominantly influenced by the charging voltage, with the sequence of effectiveness being AC pulse >AC sine >DC pulse = DC. Furthermore, an increase in voltage frequency significantly enhances the flame lift-off velocity. A simplified model, based on charge transfer in corona wind, has been utilized to derive the electric force acting on the flame. This model establishes a scaling relation that correlates flame lift-off velocity with charging voltage, frequency, waveform and duty cycle. The ion current response in our system exhibits characteristics similar to those of an electrical RC circuit, where the charging voltage has a more significant impact on charge transfer and, subsequently, ion current enhancement compared to frequency. Elevated ion current values correspond to increased flame displacement speeds and reduced flame lift-off heights. The alternation of electric fields introduces a greater degree of turbulence within flames. Near the nozzle exit, a vortex ring with a consistent rotation direction is formed. This vortex ring, driven by the induced ionic wind, facilitates flame propagation and enhances flame stabilization.

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电场波形对抬升式非预混合喷射火焰的影响
本研究系统地探讨了各种电场波形影响下的升空非预混合喷射火焰的行为。在我们的实验装置中,高压被施加到作为电极的燃料喷嘴上,而火焰则作为浮动电极。主要关注火焰腾空高度、火焰腾空速度、离子电流和流动结构对电场的响应。结果表明,火焰腾空高度主要受充电电压的影响,其有效性顺序为交流脉冲 >AC 正弦 >DC 脉冲 = DC。此外,电压频率的增加会显著提高火焰腾空速度。根据电晕风中的电荷转移,利用简化模型推导出作用在火焰上的电场力。该模型建立了火焰腾空速度与充电电压、频率、波形和占空比之间的比例关系。我们系统中的离子电流响应表现出类似于 RC 电路的特性,其中充电电压对电荷转移的影响更大,因此离子电流的增强也比频率更大。离子电流值的升高与火焰位移速度的增加和火焰腾空高度的降低相对应。电场交替会在火焰内部产生更大程度的湍流。在喷嘴出口附近,会形成一个旋转方向一致的涡环。在诱导离子风的驱动下,该涡流环促进了火焰的传播并增强了火焰的稳定性。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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