Study on Sub-Pixel Interpolation of Numerical PIV Measurement for Turbulent Premixed Flames Using DNS Data

Abstract

The detailed local flame structure in turbulent combustion has yet to be elucidated. Local flow velocity is necessary to evaluate tangential strain rate relevant to the flame structure. However, because its evaluation method is different in numerical and experimental analysis, it is difficult to compare the results obtained from both analyses and to evaluate their quantitative relationships. In this study, in order to elucidate the detailed flame structure of the turbulent premixed flame, numerical PIV is performed on the DNS data of turbulent premixed flames, and it aims to examine the influence of subpixel interpolation on accuracy of numerical PIV to compare DNS results.