A comparison study between Lorentz force and Kelvin force of heavily seeded diffusion flames

IF 5.9 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2026-05-01 Epub Date: 2026-02-28 DOI:10.1016/j.combustflame.2026.114888

Hetong Gao, Yueming Wang, Minmin Zhou, Lunbo Duan

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Abstract

The interaction of static magnetic fields with diffusion flames was examined to distinguish the roles of Kelvin and Lorentz forces under higher conducting conditions. A slot burner with K₂CO₃ seeding was used to vary charge density, potassium atoms were measured by TDLAS, and reaction-kinetics modeling provided species and conductivity at the flame front. The experiments show that Kelvin force produces symmetric deformation—reduced height and lateral widening—while the magnetic term of the Lorentz force yields asymmetric deflection along the field-orthogonal axis. Potassium seeding elevates electron concentration and conductivity, and analysis of current pathways indicates that cation convection current dominates over induction current in driving deflection. The study relates dimensionless measures of magnetic forces to the observed symmetric and asymmetric responses, thereby identifying operating ranges in which Lorentz effects become detectable under static fields. These relationships offer a compact, quantitative basis to compare conditions and anticipate morphology changes in magnetically influenced diffusion flames.

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重播种扩散火焰洛伦兹力与开尔文力的比较研究

研究了静电磁场与扩散火焰的相互作用，以区分高导电性条件下开尔文力和洛伦兹力的作用。采用带有K2CO3种子的槽式燃烧器来改变电荷密度，通过TDLAS测量钾原子，并通过反应动力学模型提供火焰前的种类和电导率。实验表明，开尔文力产生对称变形——高度降低和横向加宽——而洛伦兹力的磁项产生沿场正交轴的不对称挠度。播钾提高了电子浓度和电导率，电流路径分析表明，阳离子对流对偏转的驱动作用大于感应电流。该研究将磁力的无量纲测量与观察到的对称和非对称响应联系起来，从而确定在静态场下可以检测到洛伦兹效应的操作范围。这些关系提供了一个紧凑的，定量的基础来比较条件和预测磁影响扩散火焰的形态变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.