Numerical simulation of premixed H₂–air cellular tubular flames

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

“…Further analysis of the numerical results, combined with numerical experiments, permits discovery of the broader impacts available through cellular flame research (e.g. with premixed tubular flames [9]). Nonpremixed diffusion flames are expected to be significantly more sensitive to diffusive transport modeling 125 approximations, but what is first required is to compare the experimental characterization to the numerical predictions.…”

“…The flame geometry was simulated using a fully-implicit 2D detailed low-Mach number code [9] based on PETSc [16]. The governing equations are written in 2D (r, θ) utilizing the boundary-layer assumption for stagnating jets [17] that removes the axial dependance for tubular flames [18].…”

“…The measurements were performed with Raman scattering, which is a non-intrusive laser diagnostic technique. The simulations were performed with a 2D fully-implicit primitive variable finite difference code [9] that includes multicomponent transport (with Soret/Dufour effects) and detailed chemical kinetics. 15…”

“…The problem is formulated in differential form in terms of primitive variables, and the governing equations are shown in reference [9]. Radiation heat loss is included in the optically-thin form [20], and detailed H 2 /O 2 chemical kinetics are included [21].…”

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

“…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.…”