In this work, an approach is suggested to determine the mean flame stretch rate for a finite segment of a thin flame, in particular, for the entire flame. The suggested approach does not require averaging of local stretch rate at multiple flame locations. It is evidenced that available theoretical predictions of the mean stretch rate, which rely on the strain rate of a material surface, can be invalid for turbulent flames with edges. It is shown that the mean stretch rate of a turbulent Bunsen flame is always negative and is not sensitive to the turbulence intensity, whether the flame is self- turbulized or turbulence is imposed externally.
|Title of host publication
|Proc. of the 4th European Combustion Meeting, 14-17 april 2009, Vienna Austria
|Place of Publication
|Vienna University of Technology
|Published - 2009