Experimental study on explosion characteristics of syngas with different ignition positions and hydrogen fraction

Yu, Minggao; Luan, Pengpeng; Zheng, Kai; Yuan, Xufeng; Han, Shixin; Duan, Yulong

doi:10.1016/j.ijhydene.2019.04.046

Cited by 64 publications

(6 citation statements)

References 34 publications

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“…1. The tube outlet is sealed with PVC film [25,28]. Previous studies have shown that PVC film only acts as safe pressure relief but has no effect on flame propagation in the tube [29,30].…”

Section: Methodsmentioning

confidence: 99%

Promoting of foam copper with chaotic distributed pores on the deflagration of premixed hydrogen-air flame in the tube

Long

Duan

et al. 2022

THERM SCI

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The deflagration flame of stoichiometric hydrogen-air mixtures is studied in this paper. Combined with the foam copper structure, the deflagration characteristic is analyzed in this paper. The experimental results show that the foam copper can improve the flow instability at the flame front and the degree of turbulence in the propagation process, the flame propagates more rapidly in turbulence state, and the number of stages of flame morphology during the propagation process increases. The classic ?tulip? flame can be transformed into a distorted ?tulip? flame and a fractal ?tulip? flame before it collapses. When the flame passes through the foam copper, the flame front velocity increases as the number of structural layers increases. The flame front velocity propagates at supersonic speed through the accumulation of three layers of foam copper. The instability of overpressure in the propagation process will cause oscillation. More layers of the structure, the oscillation frequency, and the amplitude of the overpressure are increased significantly. Foam copper structure has a reverse action on overpressure. When the overpressure value is low in the early stage, the structure promotes the propagation, but the overpressure value is large in the later stage, the structure has a blocking effect.

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“…1. The tube outlet is sealed with PVC film [25,28]. Previous studies have shown that PVC film only acts as safe pressure relief but has no effect on flame propagation in the tube [29,30].…”

Section: Methodsmentioning

confidence: 99%

Promoting of foam copper with chaotic distributed pores on the deflagration of premixed hydrogen-air flame in the tube

Long

Duan

et al. 2022

THERM SCI

Self Cite

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show abstract

“…95 Studies have not determined which ignition location has the strongest effect on flame development in different cases. The situation with the 94 H 2 /air square: length, 1000; width, 100 IP0, IP100, IP300, IP500, IP700, and IP900 IP100 Yu et al ( 2019) 98 H 2 /CO/air square: length, 1200; width, 100 IP0, IP600, and IP1100 IP0 Yang et al ( 2021) 99 H 2 /air/diluent square: length, 1000; width, 100 IP0, IP100, IP300, IP500, IP700, and IP900 IP100−IP300 greatest flame risk depends on the overall test conditions, such as duct length, vent size, equivalence ratio, and obstructions. Xiao et al 83 found that, when the equivalence ratio of hydrogen−air premixed gas is in the range 0.82 ≤ Φ ≤ 4.22 in a closed pipe, the produced classical tulip flame exhibits considerable deformation.…”

Section: Effects Of Ignition Position and Equivalence Ratio On Hydrog...mentioning

confidence: 99%

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

Wang

Zhao

et al. 2023

Energy Fuels

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Hydrogen energy is a clean and efficient type of green energy whose use has been widely promoted. However, because of its physical and chemical characteristics, hydrogen tends to cause fires and explosions under certain conditions, which restricts its widespread application. After briefly describing the danger of high-pressure hydrogen (HPH), this paper summarizes the ignition and flame propagation characteristics of HPH leakage diffusion and describes the influences of various factors, such as leakage location, initial leakage velocity, initial pressure, presence of vents, ignition location, pipe size, and presence of obstacles, on these characteristics. HPH is likely to ignite spontaneously at the moment of leakage, and this ignition involves complex dynamics. Finally, the gap in the current research on HPH is described, and suggestions are provided for future research to promote the safe and efficient use of hydrogen energy.

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“…In recent years, many researchers have conducted experimental and numerical studies on the explosive characteristics of syngas. Yu et al. , studied the effect of ignition position and hydrogen concentration on the flame propagation characteristic of syngas in a rectangular tube and found that flame propagation velocity increases with the increase in hydrogen concentration. The pressure oscillation becomes more intense when the ignition position is far from the closed end.…”

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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Experimental study on explosion characteristics of syngas with different ignition positions and hydrogen fraction

Cited by 64 publications

References 34 publications

Promoting of foam copper with chaotic distributed pores on the deflagration of premixed hydrogen-air flame in the tube

Promoting of foam copper with chaotic distributed pores on the deflagration of premixed hydrogen-air flame in the tube

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

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

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