Experimental and numerical study on flame fusion behavior of premixed hydrogen/methane explosion with two-channel obstacles

Wang, Shuo; Xiao, Guoqing; Mi, Hongfu; Feng, Yu; Chen, Jian

doi:10.1016/j.fuel.2022.126530

Cited by 14 publications

(3 citation statements)

References 61 publications

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“…Natural gas is widely used as a clean energy source in various fields, but its main component, methane (CH 4 ), is flammable and explosive [ 1 , 2 ]. Although methane gas is colorless, odorless, and non-toxic, its leakage can easily lead to severe combustion and explosion accidents, resulting in significant casualties and property damage [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Yin,

Zou,

Cheng

et al. 2024

Sensors

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We aimed to improve the detection accuracy of laser methane sensors in expansive temperature application environments. In this paper, a large-scale dataset of the measured concentration of the sensor at different temperatures is established, and a temperature compensation model based on the ISSA-BP neural network is proposed. On the data side, a large-scale dataset of 15,810 sets of laser methane sensors with different temperatures and concentrations was established, and an Improved Isolation Forest algorithm was used to clean the large-scale data and remove the outliers in the dataset. On the modeling framework, a temperature compensation model based on the ISSA-BP neural network is proposed. The quasi-reflective learning, chameleon swarm algorithm, Lévy flight, and artificial rabbits optimization are utilized to improve the initialization of the sparrow population, explorer position, anti-predator position, and position of individual sparrows in each generation, respectively, to improve the global optimization seeking ability of the standard sparrow search algorithm. The ISSA-BP temperature compensation model far outperforms the four models, SVM, RF, BP, and PSO-BP, in model evaluation metrics such as MAE, MAPE, RMSE, and R-square for both the training and test sets. The results show that the algorithm in this paper can significantly improve the detection accuracy of the laser methane sensor under the wide temperature application environment.

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Section: Introductionmentioning

confidence: 99%

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Yin,

Zou,

Cheng

et al. 2024

Sensors

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“…In general, there are various obstacles of different shapes and sizes in the pipelines of mines and shafts [1] . When the flame bypasses such an obstacle, due to the interaction of the flame with the obstacle [2] , the shape of the flame, the speed of propagation, the rate of combustion of combustible gases, the explosion overpressure, and the flow field around the flame through the obstacle all show significant changes [3] . In particular, the presence of obstacles will change the complexity of the geometric layout of the explosion tube, which will largely disrupt the flow field after the explosion [4] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of the inhomogeneous LPG-air flow field in a tube containing mixed obstructions

Gao,

Wu,

Shao

et al. 2023

J. Phys.: Conf. Ser.

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Based on numerical simulation, this paper further investigates the flow field structure near the obstacle during the premixed gas deflagration. In the deflagration flow field, the pressure gradient variation and vortex structure intensity in the upper surface region of the obstacle are larger, indicating that the pressure gradient has a stronger effect on the vortex structure. The changes in density gradients and pressure gradients induced by the combined rectangular, flat barrier configuration will be more pronounced than in the model with only flat barriers. This change in turn acts back on the combustion field, which in turn has a strong perturbative effect on the flame.

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“…In addition, Ma et al 30 studied the influence of cavities on the transmission behavior of explosive flames and showed that the flame surface area increased due to the growth of vortices and the evolution of turbulence and that the expansion flow from the delayed combustion of the unburned gas in the vortex cavity accelerated the flame leading edge. Wang et al 31 investigated through numerical simulations and experiments that the explosion flame splits and merges as it passes through a two-channel obstacle, with the maximum velocity first increasing and then decreasing as the block is away from the ignition location. Cao et al 32 investigated the effect of obstacles on the explosion characteristics of syngas (H 2 /CO) under poor ignition conditions and revealed the correlation between flame propagation properties and explosion strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

Luo,

Qi,

et al. 2023

ACS Omega

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The explosion characteristics of premixed gases under different equivalence ratios (1.0–3.0) and inert gas addition (5–20%) are experimentally investigated, and sensitivity analysis of the radical reactions is carried out using the USC Mech II model to analyze the molar fraction of radicals. The results show that at high equivalence ratios, inert gas has little effect on flame stability. The addition of an inert gas reduces the tensile rate in the early stage of flame growth. At high equivalence ratios, CO 2 inhibits explosive flame propagation twice as effectively as N 2 . Due to the large heat capacity and chemical kinetic effects, CO 2 has a stronger inhibitory effect on the explosion pressure than N 2 , and the inhibition efficiency on the explosion strength is nearly twice that high. To further analyze the effect of different inert gas addition ratios on chemical kinetics, sensitivity analysis, and molar fraction simulations were performed. The thermal and chemical kinetic effects of CO 2 cause later generation of H and OH radicals and the partial chain reaction involving CO 2 causes a lower peak of H radicals than the peak of H radicals generated under an N 2 atmosphere. However, CO 2 is a direct reactant and the third body to produce a small chemical kinetic effect.

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Experimental and numerical study on flame fusion behavior of premixed hydrogen/methane explosion with two-channel obstacles

Cited by 14 publications

References 61 publications

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Analysis of the inhomogeneous LPG-air flow field in a tube containing mixed obstructions

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

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Experimental and numerical study on flame fusion behavior of premixed hydrogen/methane explosion with two-channel obstacles

Cited by 14 publications

References 61 publications

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Temperature Compensation of Laser Methane Sensor Based on a Large-Scale Dataset and the ISSA-BP Neural Network

Analysis of the inhomogeneous LPG-air flow field in a tube containing mixed obstructions

Effect of N2 and CO2 on the Explosion Properties of High Equivalence Ratios of Hydrogen

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Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen