Flame ignition or extinction is the result of very complex interactions between combustion chemistry and turbulence. It has been recently observed in experimental studies [1,2] that the presence of a plasma discharge in the vicinity of reaction zones affects combustion. For instance, a discharge generated in a combustion chamber produces a pool of radicals. These highly reactive species strongl...

In this paper, we use the lattice Boltzmann method with the Bhatnagar-Gross-Krook linear collision operator to study the flow physics induced by a rigid lamina undergoing moderately large harmonic oscillations in a viscous fluid. We propose a refill procedure for the hydrodynamic quantities in the lattice sites that are in the vicinity of the oscillating lamina. The numerically estimated flow f...

In this paper we study turbulent premixed methane flames with swirl using three-dimensional numerical simulation. The simulations are performed using an adaptive time-dependent low Mach number combustion algorithm based on a second-order projection formulation that conserves both species mass and total enthalpy. The species and enthalpy equations are treated using an operator-split approach tha...

In the present study, flame propagation statistics from turbulent statistically planar premixed flames obtained simple and detailed chemistry, three-dimensional Direct Numerical Simulations, were evaluated compared to each other. To this end, a new database was established encompassing five different conditions on combustion regime diagram, using nearly identical numerical methods same initial ...

Abstract To protect ancient buildings from fire, prevent the occurrences of and minimise losses caused by fire to maximum extent possible, this study combined experimental measurements numerical simulations analyse flame spread behaviour over wood treated with retardants. First, some blocks were a nitrogen phosphorus (water-based) retardant, then smoke combustion experiment was performed test d...

We present a study of the flame-embedding concept, introduced in [1] as an efficient approach for large-eddy simulation of turbulent combustion at high Reynolds and Damköhler numbers. In flame embedding, the combustion zone is modeled as an unsteady flame modified by the local tangential strain rate, with the latter extracted every time step from the flow field simulations. The flame structure ...

Laminar burning velocities and the flame response to stretch, as characterized by Markstein numbers, were determined experimentally and computationally for outwardly propagating spherical laminar premixed flames. The mixtures studied were premixed hydrogen/air/diluent and hydrogen/30% oxygen and 70% nitrogen (by volume)/diluent flames, with the latter condition of interest for pre-external vehi...

A single toroidal, laminar vortex in created and a laminar premixed flame is propagated over the vortex in order to study the fundamental interaction process and to compare results with the numerical solutions of the Navier-Stokes equations obtained by Poinsot, Veynante, and Candel. Results quantify the degree of flame rollup, the flame perimeter increase due to wrinkling, the minimum vortex si...

Pre-sedimentation basins are among the most important elements of the conventional water treatment process. In pre-sedimentation basins, due to different velocity gradients, secondary and rotational flows are formed that will create short paths and increase dead and still flow zones as well as changes in the flow mixing. This will prevent laminar flow conditions for sedimentation and will reduc...

The dynamic response of a premixed flame stabilized on a heat-conducting perforated plate depends critically on their coupled thermal interaction. The objective of this paper is to develop an analytical model to capture this coupling. The model predicts the mean flame base standoff distance; the flame base area, curvature and speed; and the burner plate temperature given the operating condition...