Combustion modeling of turbulent jet diffusion H2/air flame with detailed chemistry

Zhou, Xu; Sun, Zhengzhong; Brenner, Günther; Durst, F.

doi:10.1016/s0017-9310(99)00293-8

Cited by 21 publications

(15 citation statements)

References 13 publications

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“…Temperature distributions and the maximum levels in the combustor and the average levels at the combustor exit show similar trends with the experimental results [11][12][13][14][15] and other numerical works [16][17][18][19][20][21]. The overall flame temperature decreases as methane is added to the fuel because of the lower energy input.…”

Section: Modelling Resultssupporting

confidence: 84%

Investigations of hydrogen and hydrogen–hydrocarbon composite fuel combustion and emission characteristics in a model combustor

İlbaş¹,

Yılmaz²,

Kaplan³

2005

International Journal of Hydrogen Energy

119

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Section: Modelling Resultssupporting

confidence: 84%

Investigations of hydrogen and hydrogen–hydrocarbon composite fuel combustion and emission characteristics in a model combustor

İlbaş¹,

Yılmaz²,

Kaplan³

2005

International Journal of Hydrogen Energy

119

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“…Due to the difficulty in DNS simulations and heavy task in computation, in the first step, a 2D square computa- [25] involving strong turbulence-chemistry interactions. The grid in DNS should capture the Kolmogrov micro scale eddies η = (v 3 /ε) 1/4 , where v is the kinematic viscosity，and ε is the dissipation rate of the turbulence energy.…”

Section: Methodsmentioning

confidence: 99%

Direct numerical simulation of hydrogen turbulent lifted jet flame in a vitiated coflow

et al. 2007

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The direct numerical simulation (DNS) method with 16 steps detailed chemical kinetics was applied to a lifted turbulent jet flame with H 2 /N 2 fuel issuing into a wide hot coflow of lean combustion products, at temperature of 1045 K and low oxygen concentrations. The chemical reactions were handled by the library function of CHEMKIN which was called by the main program in every time step. Parallel computational technology based on message passing interface method (MPI) was used in the simulation. All the cases were run by 12 CPUs on a high performance computer system. Faver-averaged DNS results were obtained by long time averaging the transient profile and compared with the experimental data. The roll-up and evolution of the vortices in jet flame were well captured. The vortices in the same rotating direction attracted each other and those in different rotating directions repulsed each other. Through complex interactions between vortices, the original symmetrical vortex structure could be converted into nonsymmetrical and more complex structures by combination, distortion and splitting of the vortices. The transient profiles of H, OH and H 2 O mass fraction at 5.76 ms showed the flame structure in jet flame, especially the autoignition regions clearly. The lift-off height was about 9 d-11 d, in agreement with the experimental observation. At the corner point of the flame sheet indicated by OH and H profiles, the combustion was always enhanced by the flame curvature and extended resident time. The profiles of turbulence intensities show that the flames were diffused from the original two outside flame sheets into the core. The DNS results can be considered in developing more accurate and more universal turbulence models.

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“…Values of L x is 100 times greater than the hydraulic diameter. Value of L y , and L z , for acceptable free boundary condition, were selected 20 times longer than hydraulic diameter in the y-direction and z-direction [21,22]. In this geometry, e-a-b-f and c-a-b-d, are symmetry planes and b-d-h-f is outlet with fully developed boundary condition.…”

Section: Numerical Detailsmentioning

confidence: 99%

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

et al. 2009

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In this research, the fluid and thermal characteristics of a rectangular turbulent jet flow is studied numerically. The results of three-dimensional jet issued from a rectangular nozzle are presented. A numerical method employing control volume approach with collocated grid arrangement was employed. Velocity and pressure fields are coupled with SIMPLEC algorithm. The turbulent stresses are approximated using k-ε model with two different inlet conditions. The velocity and temperature fields are presented and the rates of their decay at the jet centerline are noted. The velocity vectors of the main flow and the secondary flow are illustrated. Also, effect of aspect ratio on mixing in rectangular cross-section jets is considered. The aspect ratios that were considered for this work were 1:1 to 1:4. The results showed that the jet entrains more with smaller AR. Special attention has been drawn to the influence of the Reynolds number (based on hydraulic diameter) as well as the inflow conditions on the evolution of the rectangular jet. An influence on the jet evolution is found for smaller Re, but the jet is close to a converged state for higher Reynolds numbers. The inflow conditions have considerable influence on the jet characteristics.

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Combustion modeling of turbulent jet diffusion H2/air flame with detailed chemistry

Cited by 21 publications

References 13 publications

Investigations of hydrogen and hydrogen–hydrocarbon composite fuel combustion and emission characteristics in a model combustor

Investigations of hydrogen and hydrogen–hydrocarbon composite fuel combustion and emission characteristics in a model combustor

Direct numerical simulation of hydrogen turbulent lifted jet flame in a vitiated coflow

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

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