A turbulent premixed flame on fractal-grid generated turbulence

Details A turbulent premixed flame on fractal-grid generated turbulence A turbulent premixed flame on fractal-grid generated turbulence

2010-04-13

arxiv.org/abs/1004.2146v1

Physics

Fluid Dynamics

18 pages, 10 figures

Scientific paper

A space-filling, low blockage fractal grid is used as a novel turbulence generator in a premixed turbulent combustion experiment. In contrast to the power law decay of a standard turbulence grid, the downstream turbulence intensity of the fractal grid increases until it reaches a peak at some distance from the grid before it finally decays. The effective mesh size and the solidity are the same as those of a standard square mesh grid with which it is compared. It is found that, for the same flow rate and stoichiometry, the fractal generated turbulence enhances the burning rate and causes the flame to further increase its area. Using a flame fractal model, an attempt is made to highlight differences between the flames established at the two different turbulent fields.

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