Experimental and numerical study of H2-air non-premixed cellular tubular flames

Hall, Carl A.; Pitz, Robert W.

doi:10.1016/j.proci.2016.06.149

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…This division is done in the model by altering constant coefficients in Eqs. (6)- (12). The coefficients which have 1 in their subscript are used for near-wall regions, and in regions far from the wall, subscripted coefficients by 2 will be applied [31].…”

Section: Turbulence Modelingmentioning

confidence: 99%

“…Non-rotational tubular flame has been investigated numerically and experimentally [6][7][8][9][10][11][12][13][14], but only experimental studies have been investigated the structure and stability limits of rotating tubular flames. Shimokuri and Ishizuka [15] proposed a technique to stabilize a flame in a high-velocity stream with the use of a tubular flame.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation of non-premixed and premixed rotational tubular flame: a study of flame structure and instability

Bordbar

Motaghian

Pasdarshahri

2019

J Braz. Soc. Mech. Sci. Eng.

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Tubular flames are considered due to their advantages in the geometry of the flame. The major importance of tubular flame which makes it different from other flames is its uniform temperature distribution. Therefore, it reduces the possibility of the formation of thermal fluctuations and hot spots along the furnaces. In this paper, high-speed, non-premixed and premixed tubular flames are numerically investigated using computational fluid dynamics under various operational conditions. Methane/air and CO 2-diluted methane/oxygen combustions are considered in both non-premixed and premixed modes. k − SST model, eddy dissipation concept combustion model, and P1 radiation model have been used as numerical models. Numerical results are validated against available experimental measurements in the non-premixed tubular flame using DRM22 kinetic mechanism for methane/air combustions and GRI-Mech 3.0 for methane/oxygen mixtures. The structure of the tubular flame in the combustion chamber and stability limits of tubular flame in terms of operating conditions have been studied in the present paper. Results show that premixed tubular flames establish more uniform radial temperature distribution and wider stable flame operating conditions. In addition, diluted methane/oxygen tubular flames have been shown broader stable condition limits than methane/air flames.

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Section: Turbulence Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of non-premixed and premixed rotational tubular flame: a study of flame structure and instability

Bordbar

Motaghian

Pasdarshahri

2019

J Braz. Soc. Mech. Sci. Eng.

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“…Jiaqiang et al [ 31 ] studied non‐premixed combustion of hydrogen and air in a micro combustor and found that the modification of the diffuser pipe can increase the flame stability and create better flow gas recirculation in the chamber, furthermore, increasing the length of the combustion chamber between the limit range improved the combustion efficiency. Co‐flow injection in non‐premixed combustion has been investigated by Hall and Pitz, [ 32 ] taking into account flame shape and temperature. Erete et al [ 33 ] studied the effect of different CO 2 dilution ratios in the non‐premixed air/methane combustion.…”

Section: Introductionmentioning

confidence: 99%

Analysis of premixed and non‐premixed co‐injection of volatile gas in an industrial indirect pyrolysis plant

Khodaei

Olson²,

Nikrityuk

2020

Can J Chem Eng

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Production of raw biochar from the pyrolysis of residual wood and biomass materials has recently been bolstered, in part, due to new indirect slow pyrolysis technologies such as continuous moving bed biochar reactors, rotary kiln reactors, and rotary auger systems. The self‐ignition of wood volatile gas blended with supplement fuel is achievable by adequate mixing of volatiles and stoichiometric air under standard combustion temperatures. In this study, two different CFD simulations were deployed to investigate co‐combustion of a non‐premixed swirl air/propane burner. In particular, one case with pre‐mixed air/pyrolysis gases and one case with non‐premixed air/pyrolysis gases were considered in this work. Pyrolysis gases were produced in an indirect industrial pyrolysis plant taking into consideration the contribution of major volatile components such as CH4, CO2, and CO, and two typical moisture contents predicted using the heat transfer analysis between the combustion chamber and the pyrolysis section. The finite rate model/eddy dissipation model coupled with the realizable k‐epsilon RANS model was used to render turbulence‐chemistry interactions. Validation against experimental data published in the literature and measured in the system demonstrated reasonable agreements. It was shown that the injection of premixed volatile gases and air with high temperature results in higher efficient combustion and better heat transfer rate between the combustion chamber and pyrolysis section rather than the alternative non‐premixed conditions. Due to safety considerations, utilizing a non‐premixed configuration in indirect biochar plant is advised, and further improvements through a pre‐heated excess air system and advanced swirl non‐premixed air/volatile injection nozzles is considered to mitigate the energy deficit in this configuration.

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“…Laminar tubular flames are highly stretched and curved similar to turbulent flames and thus allow for isolating and studying stretch and curvature effects in flames [1]. In the past, tubular flames have been studied at 1 bar to understand the effect of stretch and curvature on preferential diffusion in hydrogen [2][3][4][5][6][7][8][9][10][11][12] and hydrocarbon flames [13] in premixed [2][3][4][5], non-premixed [6][7][8][9][10][11][13][14][15][16], and partially premixed configurations [12]. However, at high pressures, which are also characteristic of real-life combustors, minimal literature exists in the field of premixed tubular flames [17] and nothing in the field of non-premixed tubular diffusion flames.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Structure and NO Emission Characteristics of N2- and CO2-Diluted Tubular Diffusion Flames

2019

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The structure of methane/air tubular diffusion flames with 65 % fuel dilution by either CO2 or N2 is numerically investigated as a function of pressure. As pressure is increased, the reaction zone thickness reduces due to decrease in diffusivities with pressure. The flame with CO2-diluted fuel exhibits much lower nitrogen radicals (N, NH, HCN, NCO) and lower temperature than its N2-diluted counterpart. In addition to flame structure, NO emission characteristics are studied using analysis of reaction rates and quantitative reaction pathway diagrams (QRPDs). Four different routes, namely the thermal route, Fenimore prompt route, N2O route, and NNH route, are examined and it is observed that the Fenimore prompt route is the most dominant for both CO2- and N2-diuted cases at all values of pressure followed by NNH route, thermal route, and N2O route. This is due to low temperatures (below 1900 K) found in these highly diluted, stretched, and curved flames. Further, due to lower availability of N2 and nitrogen bearing radicals for the CO2-diluted cases, the reaction rates are orders of magnitude lower than their N2-diluted counterparts. This results in lower NO production for the CO2-diluted flame cases.

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Experimental and numerical study of H2-air non-premixed cellular tubular flames

Cited by 8 publications

References 20 publications

Numerical investigation of non-premixed and premixed rotational tubular flame: a study of flame structure and instability

Numerical investigation of non-premixed and premixed rotational tubular flame: a study of flame structure and instability

Analysis of premixed and non‐premixed co‐injection of volatile gas in an industrial indirect pyrolysis plant

Numerical Study of the Structure and NO Emission Characteristics of N2- and CO2-Diluted Tubular Diffusion Flames

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