Effects of ignition disturbance on flame propagation of methane and propane in a narrow-gap-disk-burner

Jang, Hye Jin; Lee, Sang Min; Kim, Namil

doi:10.1016/j.combustflame.2020.01.019

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…In a separate research undertaking, Jang et al (17) conducted measurements and comparisons of the flame propagation velocity (FPV) and the laminar burning velocity (LBV) in situations when the disk gaps were adequately broad. The objective of this study was to examine the impact of varying the distance between disks on the sensitivity of flame structure and propagation to the volume of ignition.…”

Section: Ignition Disturbancementioning

confidence: 99%

Flame Propagation Dynamics in Open Tubes: Factors Influencing Combustion Conditions and Practical Implementations

Almyali,

H. Al Dulaimi,

Al-Fahham

2024

Salud, Ciencia y Tecnología - Serie de Conferencias

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This study examines the combustion conditions of fuel flame propagation within a tube of uniform cross-sectional area, where ignition occurs at the sealed end and the flame propagates in the direction of both the open and sealed ends. Both factors exert an influence on the configuration and functioning of combustion systems. To gain a comprehensive understanding of the impact of practical implementations in various combustion systems, it is imperative to comprehend the variations in flame propagation stages as a result of thermodynamic conditions. The operational conditions involving pressures and temperatures are considerably elevated compared to the natural settings. Numerous studies have been conducted on the propagation of flames within tubes. The present review centers on an extensive examination of the methodologies and procedures employed to investigate the phases of flame propagation, along with the impact of operational parameters on other fuels. Various aspects of flame behavior are explored in this article, focusing on flame formation, propagation, and the factors that influence them. The flame speed, which represents the rate of flame propagation, is influenced by factors such as fuel and oxidizer composition, temperature, pressure, and environmental conditions. The paper discusses the distinction between premixed and non-premixed flames and their respective characteristics. Several studies are cited to demonstrate the impact of oxygen concentration, air swirl, and fuel blending ratios on flame properties. These investigations involve experiments with different fuel-air mixtures, examining parameters such as flame luminance, temperature, soot production, and flame distortion. The measurement of laminar flame speed, which provides insights into fuel-air mixtures' diffusivity, reactivity, and exothermicity, is discussed. Various techniques for measuring laminar flame speed are mentioned, including the study of flame stability and spherical flame propagation. The paper also addresses the influence of flame stretch, which refers to the elongation or compression of a flame due to fluid flow or turbulence. Researchers aim to eliminate the effect of flame stretch to achieve accurate observations. Furthermore, the manuscript delves into factors affecting flame propagation, including the influence of aspect ratio on flame dynamics and flame oscillations. It describes experiments conducted in different geometries to observe changes in flame morphology and propagation velocity. The impact of ignition disturbances and equivalent ratio stratification on flame behavior is also explored. Studies examine the effects of ignition disruption and ignition volume on flame spread dynamics. Additionally, investigations analyze the behavior of flames under disturbances in the equivalence ratio, discussing changes in flame speed, heat release, and flame structure. Overall, these studies contribute to our understanding of flame behavior, combustion processes, and their applications in various fields, including energy production, environmental science, and engineering.

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Section: Ignition Disturbancementioning

confidence: 99%

Flame Propagation Dynamics in Open Tubes: Factors Influencing Combustion Conditions and Practical Implementations

Almyali,

H. Al Dulaimi,

Al-Fahham

2024

Salud, Ciencia y Tecnología - Serie de Conferencias

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“…Also, they found a very interesting oscillation phenomenon of the flame. Jang et al − used a narrow-gap disk burner to study the radial propagation characteristics of flame. In addition, Jiang et al − conducted extensive studies on the flame propagation characteristics within a narrow-gap disk burner.…”

Section: Introductionmentioning

confidence: 99%

Flame Propagation Characteristics of Syngas-Air in the Hele-Shaw Duct with Different Equivalence Ratios and Ignition Positions

et al. 2022

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In this paper, the effects of different ignition positions and equivalence ratios on the explosion characteristics of syngas in a half-open Hele-Shaw duct were investigated. The ignition points are set at distances of 0 and 500 mm from the closed end. Moreover, the research range of equivalence ratio is 0.8–1.2. The experimental results indicate that different ignition positions and equivalence ratios influence the flame front structure and the dynamic characteristics of flame propagation. When the ignition position is at the closed end, the flame front undergoes several typical propagation stages before eventually reaching the open end of the duct. The time required by the flame to reach the open end decreases as the equivalence ratio increases. Meanwhile, when the ignition is in the middle of the duct, the flame simultaneously spreads to the open and closed ends. The time required to reach both sides decreases with the increase in the equivalence ratio. The flame front structure and pressure are primarily affected by the ignition position and the equivalence ratio. At the same ignition position, flame propagation velocity and maximum overpressure increase with the equivalence ratio. The pressure oscillation becomes more intense when the ignition position is close to the open end. At IP 500 , when the equivalence ratio is 0.8, multiple finger-shaped flame fronts emerge, accompanied by high-frequency flame oscillations. This study can provide guidance for the study of the flame propagation characteristics of syngas in millimeter-scale burners.

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Premixed flame propagation of CH4 and C3H8 in a narrow-gap disk burner using constant-volume processes at elevated-pressure

Lee

Jang

Kim

2021

Combustion and Flame

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Effects of ignition disturbance on flame propagation of methane and propane in a narrow-gap-disk-burner

Cited by 8 publications

References 23 publications

Flame Propagation Dynamics in Open Tubes: Factors Influencing Combustion Conditions and Practical Implementations

Flame Propagation Dynamics in Open Tubes: Factors Influencing Combustion Conditions and Practical Implementations

Flame Propagation Characteristics of Syngas-Air in the Hele-Shaw Duct with Different Equivalence Ratios and Ignition Positions

Premixed flame propagation of CH4 and C3H8 in a narrow-gap disk burner using constant-volume processes at elevated-pressure

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