Impacts of plate slits on flame acceleration of premixed methane/air in a closed tube

Chen, Peng; Luo, Gang; Sun, Yongduo; Lv, Qiutong

doi:10.1016/j.joei.2017.04.001

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…These studies on slit flames offer valuable data regarding flame shape and temperature, but they somewhat lack in the quantification of NOx. In multiple flame combustors, Chen et al [19] experimentally investigated the effect of multi-layer slit structures on flame speed reduction in premixed flames. They suggested that the maximum flame length decreases as the number of slits increases, and the shear layer between flames can cause flame surface distortion due to vortex action.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

Kim,

Lee,

Son

et al. 2024

Preprint

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This study investigates the impact of thin flame combustor design on hydrogen flame characteristics and combustion performance through numerical simulations. Variations in flame shape and combustibility between 100% methane and 100% hydrogen combustion are analyzed. Three combustor header shapes (flat, concave, and convex) are modeled to assess their influence on flame behavior. Results show distinct flow patterns, with concave headers promoting strong central flows and convex headers dispersing the flow outward. Temperature field analysis indicates that hydrogen flames have higher temperatures and shorter quenching distances compared to methane flames. A comparative analysis of combustion products is conducted to evaluate combustion performance and NOx emissions. Consequently, the concave header has high combustibility and increases temperatures and NOx fraction in hydrogen combustion.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

Kim,

Lee,

Son

et al. 2024

Preprint

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“…In addition, Wang et al [8] also showed that the flow field of premixed hydrogen and air also appeared as a unique structure in the experiment. Meanwhile, Chen et al [34] suggested that the plate gaps also could stimulate the reverse flow, which showed that the blocking obstacles were similar to the plate gaps. That is to say, under the disturbance of obstacles in the deflagration, the structure of the flow field and the characters of the overpressure were influenced by the obstacles after explosion.…”

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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“…Patel [9] experimentally studied premixed turbulent combustion in a semi-confined explosion chamber, the experiment showed that the turbulence stretch dominated in regions behind the obstacles due to the presence of highly recirculating zones while the mean flamelet stretch was dominant in the flow jetting regions around the obstacles. Chen [10] studied the effects of the plate with different slit number on gas explosions by experiment and LES (Large Eddy Simulation), showed that the plate slits in a closed tube can result in flame acceleration of premixed methane/air [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Air Pollution Caused by Methane-Air Deflagration Characteristics

Zhang¹,

Feng²,

Zhang³

et al. 2020

Rev. Chim.

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In order to study the effect of combustible gas cloud releasing from FPSO upper deck facilities deflagration characteristics on air pollution, a semi-open open test pipe system was built. By changing the initial conditions such as the obstacles length, distance between obstacles, section shape of obstacles and pipe system structure, the flame propagation mechanism and overpressure changing rules of methane / air deflagration were analyzed. As a result of that, the degree of sufficiency of methane combustion was analyzed, which could be seen as air pollution level. With the increase of the length of obstacle and decrease of the distance between obstacles, the induced turbulence increased, the compression effect of unburned gas became stronger, the combustion of combustible gas became more intense and sufficient, and the flame propagation speed and the maximum overpressure increased. The effect of square cross section was more obvious on inducing turbulence than that of rectangular cross section and circular cross section. The flame front was divided into many small flames by the pipe structure obstacle, and the flame front showed as a `spiny` shape. Under the effect of �spiny� flame, the methane combustion was more sufficient, and the maximum overpressure value was 3.1 times of the circular section obstacle condition. In conclusion, as the methane-air deflagration becoming more serious, although the overpressure and flame speed would be higher and the extent of damage to the surrounding facilities would be more serious, the air pollution causing by unburned gas would abate.

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Impacts of plate slits on flame acceleration of premixed methane/air in a closed tube

Cited by 13 publications

References 23 publications

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

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

Experimental Study on the Effect of Air Pollution Caused by Methane-Air Deflagration Characteristics

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