Impact of Ammonia Content on Explosion of Methane‒Air Premixed Gas Duct with Varying Equivalence Ratios

IF 2.4 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2025-03-11 DOI:10.1007/s10494-025-00647-6

Quan Wang, Wenyan Zhu, Rui Yang, Yaoyong Yang, Rui Li, Yu Ge, Dingyu Feng, Jianshe Xu

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Abstract

In this study, a duct explosion experiment with an ammonia-methane-air mixture was conducted using a custom-built stainless steel flame acceleration duct (D = 120 mm, L/D = 45.8). The effects of varying ammonia concentrations (φ = 0%, 10%, 20%, 30%) and equivalence ratios (Φ = 0.9, 1.0, 1.1) on flame behavior were examined. The key aspects analyzed included the evolution of the explosion overpressure within the duct and the average propagation velocity of the deflagration flames. The results show that ammonia reduces the brightness of methane-air deflagration flames and that this reduction becomes more pronounced as the ammonia concentration (φ) increases, and the pressure‒time histories inside the duct have a three-peak structure (P_b, P_out, and P_ext), which is caused by the burst of the vent cover, venting of burned mixtures, and counterflow flame generated by the external explosion, Additionally, rarefaction waves in the duct following discharge can lead to oscillatory combustion, and a "backfire" phenomenon is observed in all experiments. This study provides fundamental theoretical support for the promotion and application of ammonia fuel.

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不同当量比下氨含量对甲烷-空气预混管道爆炸的影响

本研究采用特制的不锈钢火焰加速风道（D = 120 mm, L/D = 45.8），对氨-甲烷-空气混合气进行了风道爆炸实验。考察了不同氨浓度（φ = 0%、10%、20%、30%）和当量比（Φ = 0.9、1.0、1.1）对火焰行为的影响。分析的关键方面包括管道内爆炸超压的演变和爆燃火焰的平均传播速度。结果表明：氨降低了甲烷-空气爆燃火焰的亮度，且随着氨浓度（φ）的增加，这种降低更为明显；管道内的压力-时间历史呈现出三峰结构（Pb、Pout和Pext），这是由通风口盖爆裂、燃烧混合物排出和外部爆炸产生的逆流火焰引起的；排气后管道内的稀薄波会导致振荡燃烧，所有实验均观察到“逆火”现象。本研究为氨燃料的推广应用提供了基础理论支持。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.