Effects of buoyancy on turbulent premixed V-flames by large-eddy simulation. (English) Zbl 1216.80022
Summary: Buoyancy effects on turbulent premixed V-flames are investigated under normal gravity (\(+\)g) and reversed gravity (\(-\)g). Numerical simulations employ large eddy simulation (LES) with a dynamic model for sub-grid scale stress. With the assumption of fast chemistry combustion, a progress variable c-equation is applied to describe the flame front propagation. The equations are solved using a projection-based fractional step method in two dimensions for low-Mach number flows. Computed LES results of buoyancy effects on flame angle and flame brush thickness are consistent with those obtained from experiments. In both \(+\)g and \(-\)g conditions, the effects of buoyancy become important with increase in Richardson number (Ri). Buoyancy force tends to close up the flame under \(+\)g, but has the opposite effect under \(-\)g. Buoyancy force also suppresses flame wrinkling in \(+\)g and enhances wrinkling in \(-\)g. While there is a lack of experimental data available, computed axial velocity is shown to be significantly affected by buoyancy downstream from the flame holder under moderate Reynolds number.
MSC:
| 80A25 | Combustion |
| 76F65 | Direct numerical and large eddy simulation of turbulence |
| 76R10 | Free convection |
Keywords:
buoyancy; turbulent premixed combustion; large eddy simulation; dynamic model; projection methodReferences:
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