Study on the dynamic process of in-duct hydrogen-air explosion flame propagation under different blocking rates

Qin, Yi; Chen, Xiaowei

doi:10.1016/j.ijhydene.2022.04.004

Cited by 26 publications

(5 citation statements)

References 35 publications

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“…Then, as the flame passes through the obstacle, the overpressure caused by the obstacle continues to increase. As the flame propagates, the explosion overpressure undergoes a slight oscillation due to collision with compression waves [23]. The increase in flame instability causes the overpressure oscillation.…”

Section: The Effect On Dynamic Overpressurementioning

confidence: 99%

“…And the more obstacles there are, the stronger the fluid instability formed. Elshimy M. [22] and Qin [23] used numerical simulations to discuss the effect of different obstacle blocking rates on explosion flames. They concluded that an increase in obstacle blocking rates would enhance the explosion overpressure, and the structure of flames after passing through obstacles was generally the same under different blocking rate conditions.…”

Section: Introductionmentioning

confidence: 99%

“…S i is the rate of creation by addition from the dispersed phase plus any user-defined source. In this paper, the Reynolds Averaged Numerical Simulation (RANS) is used and the RNG k-ε turbulence model is introduced [21,23,26]. The RNG k-ε model is derived using a statistical technique known as reformulated group theory [23,33].…”

mentioning

confidence: 99%

“…In this paper, the Reynolds Averaged Numerical Simulation (RANS) is used and the RNG k-ε turbulence model is introduced [21,23,26]. The RNG k-ε model is derived using a statistical technique known as reformulated group theory [23,33]. It is formally similar to the Standard Model, and its features make it more accurate and reliable for gas explosion than the standard k-ε model.…”

mentioning

confidence: 99%

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Effect of Obstacle Gradient on the Deflagration Characteristics of Hydrogen/Air Premixed Flame in a Closed Chamber

Wang,

Zhong

2024

Processes

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In this paper, computational fluid dynamics (CFD) numerical simulation is employed to analyze and discuss the effect of obstacle gradient on the flame propagation characteristics of premixed hydrogen/air in a closed chamber. With a constant overall volume of obstacles, the obstacle blocking rate gradient is set at +0.125, 0, and −0.125, respectively. The study focuses on the evolution of the flame structure, propagation speed, the dynamic process of overpressure, and the coupled flame–flow field. The results demonstrate that the flame front consistently maintains a jet flame as the obstacle gradient increases, with the wrinkles on the flame front becoming increasingly pronounced. When the blocking rate gradients are +0.125, 0, and −0.125, the corresponding maximum flame propagation speeds are measured at 412 m/s, 344 m/s, and 372 m/s, respectively, indicating that the obstacle gradient indeed increases the flame propagation speed. Moreover, the distribution of pressure is closely related to changes in the flame structure, with the overpressure decreasing in the obstacle channel as the obstacle gradient increases. Furthermore, the velocity vector and vortex distribution in the flow field are revealed and compared. It is found that the obstacle tail vortex is the main factor inducing flame evolution and flow field changes in a closed chamber. The effect of the blocking rate gradient on flow velocity is also quantified, with instances of deceleration occurring when the blocking rate gradient is −0.125.

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Section: The Effect On Dynamic Overpressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Effect of Obstacle Gradient on the Deflagration Characteristics of Hydrogen/Air Premixed Flame in a Closed Chamber

Wang,

Zhong

2024

Processes

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“…Luo et al [31] found by conducting a numerical simulation that that flame front tip instability was related to the length of the obstacle, and the longer the obstacle, the faster the explosive overpressure and flame propagation speed in the tube. Meanwhile, Qin et al [32] also believed that Rayleigh-Taylor (R-T) instability always accompanied and affected flame propagation in the process of combustion and explosion, whereas Kelvin-Helmholtz (K-H) instability had a greater impact on the flame front surface. Baroclinic torque is formed by the interaction between density gradient and pressure gradient.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

et al. 2022

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Given the spatial structures and functional requirements, there are a number of different types of obstacles in long and narrow confined spaces that will cause a premixed gas explosion to produce greater overpressure and influence the flame behavior for different obstacles. Because the volume fraction of unburned gas changes with the changing height of the U-type obstacles, we can further study the influence on the volume fraction of the unburned premixed gas for the characteristics of the overpressure and the flame behaviors in the closed tube with the obstacles. The results show that after the premixed gas is successfully ignited in the pipe, the overpressure in the pipe greatly increases as the unburned premixed gas burns between the adjacent plates. Moreover, the increase of the overpressure in the closed duct becomes faster when the decrease of unburned gas becomes faster. The high-pressure areas between the plates move inversely compared with the direction of flame propagation when the height of the U-type increases, whereas the high pressure in the front of the flame moves further when the flame propagation passes all obstacles. In addition, the reversed flow structure of the flame is a coupling result for the overpressure caused by the flame propagation and the vortex between the plates. From the perspective of production safety, this study is a significant basic subject about the characteristics of overpressure and flame behaviors in a closed tube with obstacles.

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Analysis of research trends on hydrogen explosion by bibliometric approach

Gong,

Guan,

Dong

et al. 2023

Environ Sci Pollut Res

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Study on the dynamic process of in-duct hydrogen-air explosion flame propagation under different blocking rates

Cited by 26 publications

References 35 publications

Effect of Obstacle Gradient on the Deflagration Characteristics of Hydrogen/Air Premixed Flame in a Closed Chamber

Effect of Obstacle Gradient on the Deflagration Characteristics of Hydrogen/Air Premixed Flame in a Closed Chamber

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

Analysis of research trends on hydrogen explosion by bibliometric approach

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