Effect of applied AC electric field on flame spread over electrical wire with cross-linked polyethylene insulation

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-07-05 DOI:10.1016/j.combustflame.2025.114323

Zhisheng Li , Huido Lee , Jeong Park , Suk Ho Chung

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引用次数: 0

Abstract

The effect of applied AC electric field on flame spread over electrical wires with NiCr-core insulated by cross-linked polyethylene (XLPE) is experimentally investigated by varying the AC voltage and frequency. Results are compared with those for low-density polyethylene (LDPE) insulation, commonly studied in fire safety research. For the baseline case without applying electric field, XLPE-insulated case exhibits distinct behaviors such as flame splitting and a unique molten dripping via merging of newly-formed globular molten XLPE, which were not observed in LDPE-insulated one. Under applied electric fields, the flame spread rate (FSR) and molten insulation dynamics differ markedly between XLPE and LDPE. Two regimes of FSR behavior are identified for XLPE and three for LDPE, depending on voltage and frequency. At high voltage and frequency, induced magnetic fields promote flame vortex formation, increasing flame width and FSR, while excessive conditions lead to flame extinction through mass loss via electrospray and dielectrophoresis. Scaling analyses are applied to elucidate the underlying mechanisms. The flame spread rates are phenomenologically characterized depending on these various phenomena in terms of the frequency and voltage, especially emphasizing the electric field intensity on the unburned wire surface. The extinction conditions are correlated with AC voltage and frequency.

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外加交流电场对交联聚乙烯绝缘电线火焰蔓延的影响

通过改变交流电压和频率，实验研究了外加交流电场对交联聚乙烯（XLPE）绝缘nicr芯线火焰蔓延的影响。结果与消防安全研究中常用的低密度聚乙烯（LDPE）绝缘材料进行了比较。在不加电场的基线情况下，XLPE绝缘壳表现出不同于ldpe绝缘壳的火焰分裂和新形成的球状熔融XLPE熔滴现象。外加电场作用下，XLPE和LDPE的火焰蔓延速率和熔融绝缘动力学存在显著差异。根据电压和频率，确定了XLPE的两种FSR行为和LDPE的三种FSR行为。在高电压和高频率下，感应磁场促进火焰漩涡的形成，增加火焰宽度和FSR，而过高的条件会导致火焰通过电喷雾和介质电泳损失质量而熄灭。尺度分析用于阐明潜在的机制。火焰蔓延速度的现象学特征取决于这些不同的现象在频率和电压方面，特别强调未燃丝表面的电场强度。消光条件与交流电压和频率有关。

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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.