Characterization and Measurement of Heat Release Zone and Preheat Zone Thicknesses in Ammonia/Hydrogen/Nitrogen-Air Premixed Flames

DAI Hongchao; CAI Xiao; Thibault F. GUIBERTI; WANG Jinhua; HUANG Zuohua

doi:10.7652/xjtuxb202505017

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Characterization and Measurement of Heat Release Zone and Preheat Zone Thicknesses in Ammonia/Hydrogen/Nitrogen-Air Premixed Flames

更新时间：2025-08-26

- Characterization and Measurement of Heat Release Zone and Preheat Zone Thicknesses in Ammonia/Hydrogen/Nitrogen-Air Premixed Flames
- Journal of Xi’an Jiaotong University Vol. 59, Issue 5, Pages: 178-188(2025)
- 作者机构：
  
  1.西安交通大学动力工程多相流国家重点实验室， 710049，西安
  2.阿卜杜拉国王科技大学清洁能源研究平台， 23955，沙特阿拉伯图沃
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202505017
  CLC： TK91
- Received：16 September 2024，
  
  Online First：17 December 2024，
  
  Published：10 May 2025
- 稿件说明：
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DAI Hongchao, CAI Xiao, Thibault F. GUIBERTI, et al. Characterization and Measurement of Heat Release Zone and Preheat Zone Thicknesses in Ammonia/Hydrogen/Nitrogen-Air Premixed Flames[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 178-188.
DOI：

DAI Hongchao, CAI Xiao, Thibault F. GUIBERTI, et al. Characterization and Measurement of Heat Release Zone and Preheat Zone Thicknesses in Ammonia/Hydrogen/Nitrogen-Air Premixed Flames[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 178-188. DOI： 10.7652/xjtuxb202505017.

摘要

针对氢氨火焰热释放区和预热区的表征方法尚不清楚的问题，采用CHEMKIN软件的一维传播火焰模拟方法并结合NH与NH

的激光诱导荧光诊断实验测量结果，对氨气/氢气/氮气-空气预混火焰中火焰结构的潜在标记物进行了探究。系统比较了不同氨气裂解比、当量比下多种标记物对热释放率空间分布、热释放区厚度和预热区厚度的表征效果。结果表明：在贫燃条件下，NH的归一化浓度与热释放率分布的空间相关性较好，NH

、NO的归一化浓度乘积在所有工况下均与热释放率轮廓保持良好的相关性；NH的归一化浓度可靠表征了热释放率轮廓的峰值位置，NH

、NO的归一化浓度乘积能更好地表征热释放区厚度；使用归一化浓度加和的局部极小值位置可标记预热区前沿，NH

、NH的归一化浓度之和在各种工况下能表征约30%的预热区厚度，而NH

、NO的归一化浓度之和能表征高达60%的预热区厚度，NH和NH

的激光诱导荧光诊断结果进一步验证了这些标记物的实验可行性。结合实验结果与模拟修正结果，NH的归一化浓度可用于计算热释放区，NH

、NH的归一化浓度之和能够准确计算热释放区和预热区的厚度。研究结果可为氢氨湍流火焰结构表征提供参考。

Abstract

Addressing the unclear characterization methods for the heat release zone and preheat zone of hydrogen-ammonia flames

a one-dimensional propagating flame simulation approach using CHEMKIN software is employed

in conjunction wi

th experimental measurements from laser-induced fluorescence diagnostics of NH and NH

to investigate potential markers for flame structure in ammonia/hydrogen/nitrogen-air mixtures. A systematic comparison is conducted to evaluate the effectiveness of various markers in characterizing the spatial distribution of the heat release rate

the thickness of the heat release zone

and the thickness of the preheat zone under different ammonia cracking ratios and equivalence ratios. The results show that under lean combustion conditions

the normalized concentration of NH exhibits a good spatial correlation with the distribution of heat release rate

while the normalized concentration product of NH

and NO consistently correlated well with the heat release rate profile across all working conditions. The normalized concentration of NH accurately represented the location of the heat release rate peak

and the normalized concentration product of NH

and NO serves as a more effective indicator for the thickness of the heat release zone. The local minimum location of several normalized concentration sums was proposed as markers for the preheat zone leading edge. The normalized concentration sum of NH

and NH could represent approximately 30% of the preheat zone thickness

whereas the normalized concentration sum of NH

and NO could reach up to 60%. Laser induced fluorescence diagnostic results of NH and NH

further confirmed the experimental feasibility of these markers. Combining experimental results with simulation-revised outcomes

the normalized concentration of NH can be utilized for accurate calculation of the heat release zone

while the sum of the normalized concentrations of NH

and NH allows for precise determination of the thicknesses of both the heat release zone and the preheat zone. The findings provide useful guidance for flame structure identification in hydrogen-ammonia turbulent flames.

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references

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