Experimental investigation on explosion flame propagation of H 2 -O 2 in a small scale pipeline

Wang, Cheng; Wu, Shuanghe; Zhao, Yongyao; Addai, Emmanuel Kwasi

doi:10.1016/j.jlp.2017.06.004

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…Eventually, the pressure peak becomes strong enough to affect reactions. The presented scenario of DDT can be classified as transition that occurs in the form of a “volume explosion” and it is one of many cases that can be observed in experiments 24 . See Figure 8C, there exist unreacted pocket in the flame area, and they all burn after 1 μs.…”

Section: Resultsmentioning

confidence: 92%

“…Experiments were implemented in a horizontal explosion channel. 24 The channel is closed at both ends with a square cross section of 20 mm × 20 mm, and the length is 1.5 m. Transducers, vacuum gage as well as other measuring devices were installed in the hole on the side of the channel. The ignition position was 20 mm away from the left end.…”

Section: Experimental Details and Validation Of Numerical Methodsmentioning

confidence: 99%

“…The presented scenario of DDT can be classified as transition that occurs in the form of a "volume explosion" and it is one of many cases that can be observed in experiments. 24 See Figure 8C, there exist unreacted pocket in the flame area, and they all burn after 1 μs. When t = 1.935 ms, the ultrafast flame and flame front catch up with the leading shock, and the flame leading front in the middle of the channel changes from hemispherical to a quasi-plane.…”

Section: F I G U R Ementioning

confidence: 99%

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Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Zhao

Zhang²

2022

Engineering Reports

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Large eddy simulation is used to simulate flame acceleration and deflagration to detonation transition of methane-air mixtures in a small-scale 3D channel. The simulation results show the changing of the flame surface 3D structure in the stage of flame acceleration and deflagration to detonation transition. In the first stage, the flame velocity increases exponentially because of the expansion of combustion products and the wrinkle of flame surface. In the next stage, the interaction between flame and pressure wave makes flame accelerate continuously, and the acceleration rate of the flame velocity decreases first and then increases. As the pressure of the leading shock increases, the boundary layer is heated by the preheating area in front of the flame surface at the channel wall. Because the cross section of the channel is square, the ultrafast flame first appears in the boundary layer of the four inner edges between the channel wall, then it appears in the boundary layer on the channel wall. The ultrafast flame generates oblique shock waves continuously moving to the center of the channel and colliding with each other, which promote the occurrence of local explosion and the coupling of flame surface and leading shock wave.

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Section: Resultsmentioning

confidence: 92%

Section: Experimental Details and Validation Of Numerical Methodsmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

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Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Zhao

Zhang²

2022

Engineering Reports

Self Cite

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“…However, when the flame passes through L3, the flame front velocity further increased and reached 353 m/s in the monitoring range, the flame propagates at supersonic (Mach number value is about 1.04). The flame front velocity is mainly derived from the fluid flow velocity [31], and maximum flame propagation velocity increased with the increase of pressure in the pipe [41]. So, the irregular pore structure of the foam copper can promote the interaction between overpressure and flame propagation velocity then accelerate the flame transition of laminar to turbulent.…”

Section: Flame Front Propagation Speedmentioning

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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“…The ame front becomes unstable under the action of instabilities such as diffusional/thermal instability or hydrodynamic instability, increasing the contact area between the ame surface and the unburned gas, which causes the ame to self-accelerate. [1][2][3][4][5][6] This self-acceleration effect can affect the entire ame combustion process and cause more serious damage. Therefore, it is of great practical signicance to limit the formation and growth of cellular ames in the initial stage of a methane/air explosion to reduce explosion hazards.…”

Section: Introductionmentioning

confidence: 99%

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist

et al. 2019

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Experimental investigation on explosion flame propagation of H 2 -O 2 in a small scale pipeline

Cited by 12 publications

References 16 publications

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

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

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist

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Experimental investigation on explosion flame propagation of H 2 -O 2 in a small scale pipeline

Cited by 12 publications

References 16 publications

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

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

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO2 and ultrafine water mist

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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist