A novel vortex combustion device: Experiments and numerical simulations with emphasis on the combustion process and NOx emissions

Dostiyarov, Abay; Hristov, Jordan; Umyshev, Dias R.; Yamanbekova, Ayaulym Konysbekovna; Ozhikenova, Zhanat

doi:10.2298/tsci210920011d

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Previous studies of combustion processes have shown that the turbulence model has a sufficient level of accuracy [15], which determined the choice of this model.…”

Section: Numerical Model and Verificationmentioning

confidence: 99%

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

Zhou

Chen

et al. 2023

THERM SCI

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The pipe structures and opening conditions have an important influence on gas explosion, but little research has been done on the coupling analysis of the two. In order to reveal the effect of pipe structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions, the flame structure, flame propagation velocity, explosion pressure and flow field distribution in the explosion process of hydrogen-air premixed gas in different pipe structures were analyzed by numerical simulation. The results show that the flame propagation velocity and pressure are less influenced by the end-opening structure in the initial ignition stage, however, when the flame propagates to the pipe end, the flame propagation velocity in each pipe structure is significantly enhanced. The 90? elbow has a certain inhibitory effect on the flame development, while the T-shaped bifurcation structure can effectively increase the degree of gas detonation. In pipe with large aspect ratio, due to the wall effect, the effect of acoustic oscillation disturbance on the flame front and the airflow release effect of the end-opening, there are two peaks and two troughs in the pressure rise rate curve of each pipeline structure.

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“…Previous studies of combustion processes have shown that the turbulence model has a sufficient level of accuracy [15], which determined the choice of this model.…”

Section: Numerical Model and Verificationmentioning

confidence: 99%

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

Zhou

Chen

et al. 2023

THERM SCI

View full text Add to dashboard Cite

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Simulation study on effect of nozzle geometry on flameless combustion of non-preheated methane gas

Zhang,

Liu,

Huang

et al. 2024

THERM SCI

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In this paper, the effects of different burner configurations on the characteristics of flameless combustion were evaluated by comparing the temperature field, NOx, OH and H2CO at different burner inlet velocity and angles through a combination of experimental and numerical simulations. The results show that increasing the burner inlet angle and gas velocity is imperative in achieving the flameless combustion, increasing the recirculation rate in the furnace, making the temperature distribution in the furnace uniform, and reducing the emission of NOx at the end of the furnace. During the simulation of flameless combustion, it was found that OH radicals and H2CO radicals were well correlated with the reaction exothermic zone, and the Reynolds number was positively correlated with the recirculation rate in the furnace. With the increase of Reynolds number, the entrainment rate of flue gas increases, and the combustion state is closer to flameless combustion. When recirculation rate Kv >2, combustion becomes flameless. Through the summary analysis of the data, it can be found that there is a critical Reynolds number for the burner to achieve flameless combustion, and flameless combustion occurs only when the Reynolds number is greater than 1.0?104.

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A novel vortex combustion device: Experiments and numerical simulations with emphasis on the combustion process and NOx emissions

Cited by 2 publications

References 16 publications

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

Simulation study on effect of nozzle geometry on flameless combustion of non-preheated methane gas

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