Numerical study on flame structure in H2-O2/CO2 laminar flames

Park, Jeong; Keel, Sang-In; Shim, Sung-Hoon; Noh, Dong-Soon

doi:10.1002/er.902

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…In most practical thermal‐power devices (like vehicle engines, marine engines, gas turbines, and power plants), hydrogen could be combusted as a fuel to provide energy, and the turbulent premixed flame is the utter common flame mode in such combustions. As 1 key to flame's intrinsic combustion properties and flame's propagation speed, the flame structure is attracting more and more scientific concerns, especially on hydrogen premixed flames for the distinct characteristics.…”

Section: Introductionmentioning

confidence: 99%

Structure of turbulent rich hydrogen-air premixed flames

Sun

2018

Int J Energy Res

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Summary In the present article, series of experiments were conducted to study the structure characteristics of premixed flames in turbulent rich hydrogen‐air mixtures within a constant‐volume turbulent combustion system, 7 equivalence ratios (1.2, 1.4, 1.6, 1.8, 2.0, 2.2, and 2.5), and 5 turbulent intensity (0, 0.494, 0.742, 1.080, and 1.309 m/s) were studied. With the increase of turbulent intensity, the cellularity degree was obviously enhanced for turbulence promoted the formation and the development of initial cracks by wrinkling flame‐front; furthermore, the enhanced hydrodynamic instability was also one important reason. Turbulence would change the linear growth of critical radius to equivalence ratio into nonlinear, but the variation extents had limitation. The wrinkling index of flame‐front would rise as flame expanded, and the wrinkling index on flames with similar size would be increased with the increase of turbulence once the turbulent intensity was sufficiently high. From the variations of the root mean square of related oscillation on flame‐front, it could be found that the partial amount of oscillation induced by sole turbulence was declined as flame expanded for the breakup of large eddies.

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Section: Introductionmentioning

confidence: 99%

Structure of turbulent rich hydrogen-air premixed flames

Sun

2018

Int J Energy Res

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“…A numerical study on a H 2 ‐O 2 /CO 2 laminar flame structure was performed by Park et al . using a detailed chemistry mechanism. They studied the effect of CO 2 addition on flame structure, and their results showed significant effect of flame temperature on the intermediately produced species.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of oxy-fuel combustion in a porous plate reactor

Habib

Tahir

Nemitallah

et al. 2015

Int. J. Energy Res.

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SUMMARYThe present work focuses on studying experimentally and numerically the oxy-fuel combustion characteristics inside a porous plate reactor towards the application of oxy-combustion carbon capture technology. Initially, non-reactive flow experiments are performed to analyze the permeation rate of oxygen in order to obtain the desired stoichiometric ratios. A numerical model is developed for non-reactive and reactive flow cases. The model is validated against the presently recorded experimental data for the non-reacting flow cases, and it is validated against the available literature data for oxyfuel combustion for the reacting flow cases. A modified two-step oxy-combustion reaction kinetics model for methane is implemented in the present model. Simulations are performed over wide range of operating oxidizer ratios (O 2 /CO 2 ratio), from OR = 0.2 to OR = 0.4, and over wide range of equivalence ratios, from φ = 0.7 to φ = 1.0. The flame length was decreased as a result of the increase of the oxidizer ratio. Effects of CO 2 recirculation amount on the oxy-combustion flame stability are examined. A reduction in combustion temperature and increase in flame fluctuations are encountered while increasing CO 2 concentration inside the reactor. At high equivalence ratio, the combustion temperature and flame stability are improved. At low equivalence ratio, the flame length is increased, and the flame was moved towards the reactor center line.

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Numerical study on steam-added mild combustion

Park

Choi

Kim

et al. 2004

Int. J. Energy Res.

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SUMMARYNumerical study on flame structure and NO emission is conducted covering a wide range of atmospheric temperature, high temperature, and mild combustion regimes in H 2 -Air laminar flames diluted with steam. Special concern is focused on the difference of flame structure and NO emission behaviour between hightemperature combustion and mild combustion modes. The important role of chemical effects of added steam in flame structure and NO emission behaviour is also discussed. It is seen that there exists an oxidizer-side temperature limit which the combustion mode changes from high temperature combustion to mild combustion. In high temperature combustion modes the OH production via the reaction step, (-R23) is suppressed while in mild combustion modes is enhanced by the increase of oxidizer-side temperature. It is also found that chemical effects of added steam are influenced by the competition between both the reaction steps, (R21) and (-R23).NO emission index increases with increasing oxidizer-side temperature and decreases with mole fraction of added steam. The remarkably produced OH due to chemical effects of added steam does not contribute to the increase of NO but plays a role of holdback on NO in thermal mechanism. It is also seen that in both the high temperature combustion and mild combustion modes NO emission indicates a consistently similar tendency, and is consequently recognized that in the whole ranges steam addition suppresses NO emission.

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Numerical study on flame structure in H2-O2/CO2 laminar flames

Cited by 5 publications

References 11 publications

Structure of turbulent rich hydrogen-air premixed flames

Structure of turbulent rich hydrogen-air premixed flames

Experimental and numerical analysis of oxy-fuel combustion in a porous plate reactor

Numerical study on steam-added mild combustion

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