Effect of oxygen enrichment and NH3 pre-cracking on laminar burning velocity and intrinsic instability of NH3/bio-syngas

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-11-13 DOI:10.1016/j.ijhydene.2024.11.121

Lijuan Wen, Qifeng Zhu, Jingwei Zeng, Haoxin Deng, Guoyan Chen, Xiaoping Wen, Fahui Wang, Qizheng Hao

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Abstract

This paper investigates the laminar burning velocity (S_L) and instability of NH₃/bio-syngas under different bio-syngas contents, oxygen enrichment factors (Ω), and the cracking ratio of NH₃ (ζ) using a constant-volume combustion bomb. The results show that increasing bio-syngas, Ω, and ζ effectively enhance the S_L of the fuel. Around ζ = 60%, the relationship between S_L and the NH₃ content before cracking is reversed. Increasing the bio-syngas and ζ enhance S_L through the chemical effect, while Ω primarily enhances S_L through the thermal effect. When Ω = 50%, the contribution of thermal effect can reach up to 94.53%. Linear stability analysis indicates that increasing the bio-syngas content and ζ reduces the critical Peclet number (Pe_c), while Ω increases Pe_c. As the bio-syngas content and ζ increase, the growth rate of perturbation (∑) monotonically increases, indicating instability. Ω, on the other hand, decreases ∑, making it negative.

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富氧和 NH3 预裂解对 NH3/生物合成气层流燃烧速度和内在不稳定性的影响

本文使用恒容燃烧弹研究了不同生物合成气含量、富氧系数（Ω）和 NH3 裂解率（ζ）条件下 NH3/生物合成气的层燃速度（SL）和不稳定性。结果表明，增加生物合成气、Ω 和 ζ 能有效提高燃料的可燃性。在 ζ = 60% 左右，SL 与裂解前 NH3 含量之间的关系发生了逆转。增加生物合成气和 ζ 可通过化学效应提高 SL，而 Ω 则主要通过热效应提高 SL。当 Ω = 50% 时，热效应的贡献可达 94.53%。线性稳定性分析表明，增加生物合成气含量和 ζ 会降低临界佩克莱特数（Pec），而 Ω 会增加临界佩克莱特数。随着生物合成气含量和 ζ 的增加，扰动增长率（∑）单调增加，表明不稳定。而 Ω 则会降低 ∑，使其成为负值。

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

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.