永磁场对预混 CH₄ 火焰的影响

Title: Effect of Permanent Magnetic Field on Premixed CH4 Flames

题目：永磁场对预混 CH₄ 火焰的影响

Authors: Muhammad BILAL, Bipro GAIN, Kairu JIN, Zhenyu TIAN

作者：Muhammad Bilal, Bipro Gain, 金楷茹, 田振玉

单位：中国科学院工程热物理研究所；中国科学院大学；中国科学院工程热物理研究所 长时储能重点实验室

Journal of Thermal Science, 2025, 34(3): 771-779.

Abstract: This study quantitatively examines the impact of magnetic fields on methane flame characteristics, specifically analyzing changes in flame height, width, and velocity. Using flame photography and Particle Image Velocimetry (PIV), the effects of varying magnetic field strengths (ranging from 25 to 45 mT) on flame behavior were measured across equivalence ratios (φ) from 0.8 to 2.0. The results reveal that applying a magnetic field increases flame height by up to 6.75% while reducing flame width by approximately 6% under a field strength of 45 mT at φ=2.0. Additionally, PIV data demonstrate a significant increase in upward flame velocity, with an observed enhancement of 20% at higher magnetic field intensities. The gradient magnetic field was found to reduce flame distortion, leading to a smoother flame profile. Compared to the control group (M0, with no magnetic field), these findings confirm that magnetic fields can effectively adjust flame properties. This study underscores the potential of magnetic fields in optimizing combustion processes.

摘要：本研究定量分析了磁场对甲烷火焰特性的影响，具体考察了火焰高度、宽度及速度的变化。采用火焰摄影和粒子图像测速（PIV）技术，研究了不同磁场强度（25 至 45 mT）在当量比（φ）从 0.8 到 2.0 范围内对火焰行为的影响。结果表明，在 φ=2.0 且磁场强度为 45 mT 的条件下，施加磁场可使火焰高度最高增加 6.75%，同时火焰宽度约减少 6%。此外，PIV 数据显示在较高磁场强度下，火焰上升速度显著提升，增强幅度达到 20%。梯度磁场能够有效减少火焰形变，使火焰轮廓更加平滑。与对照组（M0，无磁场）相比，这些结果证实了磁场可有效调控火焰特性。本研究强调了磁场在优化燃烧过程中的潜力。

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