Abstract
The relation of the flame displacement speeds of turbulent premixed flame obtained by both of an experimental analysis method and a numerical calculation was researched using the three-dimensional DNS database of the turbulent premixed flame. The two-dimensional flame displacement speed is experimentally evaluated by a laser sheet imaging approach. In this study, firstly, the flame displacement speeds were obtained by the numerical calculation using both the three-dimensional set and the two-dimensional component of DNS data, and were compared. It was found that negative flame displacement speed appeared only in the two-dimensional calculation. Secondly, the flame displacement speed was evaluated by the analysis method imitated experimental imaging approach, and was compared with the two-dimensional flame displacement speed obtained by the numerical calculation. As a result, it was found that the statistics of the flame displacement speed differed depending on the way to consider the local velocity in experimental analyses.
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