Experimental study of flame evolution, frequency and oscillation characteristics of steam diluted micro-mixing hydrogen flame

Cao, Zhen; Lyu, Yajin; Peng, Jiangbo; Qiu, Penghua; Liu, Li; Yang, Chaobo; Yu, Yang; Chang, Guang; Yan, Biao; Sun, Shuhui; Yu, Xin

doi:10.1016/j.fuel.2021.121078

Cited by 21 publications

(4 citation statements)

References 56 publications

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“…The stability of micro-combustion depends on reactions, heat transfer, and the interaction between burned and unburned gases [23,24]. Factors like flow fields, temperature, and species distribution in microchannels can cause combustion instabilities such as flame blowout, oscillations, and asymmetric distribution [25,26]. High heat loss from combustor walls can lead to non-self-sustaining combustion, including thermal or radical extinction in small chambers [27].…”

Section: Challenges Within Microcombustionmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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This work presents a state-of-the-art review of micro-combustion flame dynamics and micro propulsion systems. In the initial section, we focus in on the different challenges of micro-combustion, investigating the typical length and time scales involved in micro-combustion and some critical phenomena such as flammability limits and the quenching diameter.We present an extensive collection of studies on the principal types of micro-flame dynamics, including flashback, blow-off, steady versus non-steady flames, mild combustion, stable flames, flames with repetitive extinction, and ignition and pulsatory flame burst. In the final part of this review, we focus on micropropulsion systems, their performance metrics, conventional manufacturing methods, and the advancements in Micro-Electro-Mechanical Systems manufacturing.

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Section: Challenges Within Microcombustionmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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“…Recently, studies have been conducted to investigate the flame behavior and shape changes due to hydrogen mixing due to the combustion rate of hydrogen seven times faster than methane [7][8][9]. The targets to be overcome in hydrogen-methane combustion are the large amount of NOx generated due to high-temperature flames [10][11][12]. In addition, the application of ultra-lean burn technology as a means to solve this problem may additionally cause flame stabilization problems [13,14].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

Kim,

Lee,

Son

et al. 2024

Preprint

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This study investigates the impact of thin flame combustor design on hydrogen flame characteristics and combustion performance through numerical simulations. Variations in flame shape and combustibility between 100% methane and 100% hydrogen combustion are analyzed. Three combustor header shapes (flat, concave, and convex) are modeled to assess their influence on flame behavior. Results show distinct flow patterns, with concave headers promoting strong central flows and convex headers dispersing the flow outward. Temperature field analysis indicates that hydrogen flames have higher temperatures and shorter quenching distances compared to methane flames. A comparative analysis of combustion products is conducted to evaluate combustion performance and NOx emissions. Consequently, the concave header has high combustibility and increases temperatures and NOx fraction in hydrogen combustion.

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“…4 With the development of experimental methods with high spatial and temporal resolution, studies on flameout characteristics and dynamics are increasingly abundant. [5][6][7][8][9] The flameout characteristic of swirling flame is subject to many factors. Rock et al performed an experimental study on the near lean blow-off dynamics of spray flame in Georgia Tech spray combustor.…”

Section: Introductionmentioning

confidence: 99%

“…4 With the development of experimental methods with high spatial and temporal resolution, studies on flameout characteristics and dynamics are increasingly abundant. 5–9…”

Section: Introductionmentioning

confidence: 99%

Lean flameout characteristics and unsteady dynamics of swirling non-premixed flame with and without outer flame

Qi,

Hu,

Qiang

et al. 2023

International Journal of Spray and Combustion Dynamics

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The planar laser induced hydroxyl fluorescence (OH-PLIF) technique was used to study three kinds of swirling flame, namely flames I, II, and III, by changing swirl conditions. According to the PLIF results, double structure exists in flames I and II. The inner flame burns in the inner shear layer and is anchored by vortex breakdown, which is similar to the M- or V-shaped flame. The unique outer flame is attached to the inner wall of the air annular nozzle and burns in the outer shear layer. The lean blowout (LBO) equivalent ratio of swirling flame with outer flame is lower than that without outer flame. It is interesting to compare the LBO mechanisms among the three types and the traditional swirling flame, and investigate their unsteady characteristics. Firstly, the flameout process of flames I and II starts from the local extinguishing at the root of the outer flame. However, the LBO process of flame III is consistent with that of traditional swirling flame, that is, it starts with repeated extinguishing and reigniting at the root of the inner recirculation zone (IRZ). Secondly, the unsteady characteristics of the three flames are analyzed by spectral proper orthogonal decomposition. It is found that flame oscillations, asymmetric disturbances, and longitudinal disturbances of different frequencies exist in different combinations under near-LBO conditions. In particular, asymmetric and P-wave disturbances mainly exist in the inner shear layer and jet breaking down, which further indicates the stability and anti-LBO potential of the outer flame.

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Experimental study of flame evolution, frequency and oscillation characteristics of steam diluted micro-mixing hydrogen flame

Cited by 21 publications

References 56 publications

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

Lean flameout characteristics and unsteady dynamics of swirling non-premixed flame with and without outer flame

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