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Consideration on the Flow Velocity in the Experimental Analysis of the Flame Displacement Speed Using DNS Data of Turbulent Premixed Flames with Different Lewis Numbers

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DOI: 10.4236/ojfd.2014.43021    2,501 Downloads   2,868 Views
Author(s)
Kazuya Tsuboi*, Shingo Morishita, Eiji Tomita

Affiliation(s)

Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.

ABSTRACT

The flame displacement speed is one of the major characteristics in turbulent premixed flames. The flame displacement speed is experimentally obtained from the displacement normal to the flame surface, while it is numerically evaluated by the transport equation of the flame surface. The flame displacement speeds obtained both experimentally and numerically cannot be compared directly because their definitions are different. In this study, two kinds of experimental flame displacement speeds—involving the mean inflow velocity and the local flow velocity—were simulated using the DNS data with the different Lewis numbers, and were compared with the numerical flame displacement speed. The simulated experimental flame displacement speed involving the mean inflow velocity had no correlation with the numerical flame displacement speed, while the simulated displacement speed involving the local flow velocity had a clear correlation with the numerical displacement speed in the cases of higher Lewis number than unity. The correlation coefficient of the simulated displacement speed involving the local flow velocity with the numerical displacement speed had a maximum value on the isosurface of the reaction progress variable with the maximum temperature gradient where the dilation effect of the flame is strongest.

KEYWORDS

Flame Displacement Speed, Simulating Experimental Measurement and Analysis, Lewis Number, Dilation Effect, Turbulent Premixed Flame, Direct Numerical Simulation

Cite this paper

Tsuboi, K. , Morishita, S. and Tomita, E. (2014) Consideration on the Flow Velocity in the Experimental Analysis of the Flame Displacement Speed Using DNS Data of Turbulent Premixed Flames with Different Lewis Numbers. Open Journal of Fluid Dynamics, 4, 278-287. doi: 10.4236/ojfd.2014.43021.
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