Three-dimensional direct numerical simulations of spherically propagating premixed turbulent hydrogen flames were carried out to clarify the influence of turbulence scale on propagating hydrogen air flame. In a previous study 4 results suggested that an optimum integral length scale exists to promote flame propagation, with which the maximum burning velocity was obtained. This study investigates the influence of variation of turbulence scale on turbulent flame propagation and burning velocity within multiple turbulent flame radii. Results of the work suggest that an integral length scale was found where the maximum turbulent burning velocity exist. Also, it got larger as flame propagated.
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