掺氢丙烷MILD燃烧与传统燃烧的反应传播速度数值研究
Numerical Study on Reaction Propagation Speed in Propane/Hydrogen MILD Combustion and Traditional Combustion
DOI: 10.12677/app.2026.166061, PDF,    科研立项经费支持
作者: 刘立业, 张健鹏：四川大学空天科学与工程学院，四川 成都
关键词: MILD燃烧；无焰燃烧；火焰传播速度；掺氢燃烧；Da；MILD Combustion； Flameless Combustion； Flame Propagation Speed； Hydrogen-Blended Combustion； Da
摘要: 针对MILD燃烧无视觉可见火焰的现象，本文提出了一种基于火焰传播速度的分析方法，用于预混丙烷掺氢MILD燃烧的反应传播速度评估。通过CFD模拟与CHEMKIN化学动力学计算相结合的方式，研究了MILD燃烧与传统有焰燃烧在掺氢比FH2 = 0%~50%条件下的流动速度、燃烧反应传播速度及Damköhler数(Da)的空间分布。本研究改进了丙烷–氢气MILD燃烧层流火焰速度经验公式，将其预测误差控制在10%以内。研究发现：主要反应区内Da保持在1左右，Da的空间分布主要由流动特征时间主导，表明在MILD燃烧中化学时间与混合时间相当。与传统燃烧不同的是，MILD主要反应区域内湍流火焰速度低于局部流速，湍流增强因子在全流场大于1，为揭示无焰燃烧的实现建立机制提供了一种新的视角。
Abstract: To address the phenomenon of visually invisible flames in MILD (Moderate or Intense Low-Oxygen Dilution) combustion, this paper proposes a method based on flame propagation speed to evaluate the reaction propagation speed of propane/hydrogen MILD combustion. By using Computational Fluid Dynamics (CFD) simulations and CHEMKIN chemical kinetic calculations, the spatial distributions of flow velocity, combustion reaction propagation speed, and the Damköhler number (Da) were investigated for both MILD combustion and conventional flaming combustion at hydrogen blending ratios (FH2) ranging from 0% to 50%. This study improved the empirical formula for the laminar flame speed of propane-hydrogen MILD combustion that its prediction error is within 10%. The results reveal that Da remains at approximately 1 within the main reaction zone, and its spatial distribution is predominantly governed by the characteristic flow time. This indicates that the chemical timescale is comparable to the mixing timescale in MILD combustion. Unlike conventional combustion, the turbulent flame speed within the main MILD reaction zone is lower than the local flow velocity, and the turbulence enhancement factor is greater than 1 throughout the entire flow field. These findings offer a new perspective for describing the establishment of flameless combustion.
文章引用：刘立业, 张健鹏. 掺氢丙烷MILD燃烧与传统燃烧的反应传播速度数值研究[J]. 应用物理, 2026, 16(6): 666-682. https://doi.org/10.12677/app.2026.166061

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