Fractal Analysis of Flame Front during the Early Stages of Propagation in a SI Engine 18ICES/030
Authors
Yoshihiro Nomura - Toyota Central R&D Labs., Inc
Rio Shimizu - Toyota Motor Corporation
Abstract
The objective of this study is to investigate the structure and characteristics of premixed turbulent flames in SI engines for the validation and improvement of the numerical simulation. Fractal analysis with LIF technique was performed to the flame of early stages in the cylinder and following results were obtained. 1) During the propagation, fractal dimension and inner cutoff were almost constant. Only outer cutoff scale was increased with flame radius. Therefore it seems that the increase of flame surface area is controlled by the flame own radius. 2) The flame surface area and laminar flame speed were obtained from the fractal measurements and compared to those of conventional combustion model. Fairly good agreements were obtained.