Local scalar flame properties of freely propagating premixed turbulent flames at various Lewis numbers

Experimental Measurement of Local Burning Velocity Within a Rotating Flow

“…Using the velocity of the surrounding charge to convect the flame front to a theoretical position, prior to the measurement of burning velocity, enables its impact on the flame movement to be included regardless of its magnitude and direction. The flame is still considered to propagate in a direction normal to its surface, a view that is supported by the results shown in many studies of flame response to curvature and stretch [1,5,6,8,9,11]. More information regarding the experimental technique employed is included in section 2.…”

“…Examples of this approach include the work carried out by Renou et al [11] and Sinibaldi et al [12]. The basis of this work is that the local burning velocity (u t ) is measured as being the difference between the local flame velocity (V F ), measured normal to the flame front (n), and the local flow velocity in the same direction (V G ).…”

The structure of turbulent flames in fractal- and regular-grid-generated turbulence

“…Different smoothing procedures are applied before the curvature calculation in order to filter the pixilation noise and obtain an approximately continuous contour again. Filters often used are the Savitzky-Golay filter [68], spatial filters [70,73] or polynomial curve fits [74]. In each case the filtering 27 parameters such as the kernel size of the Savitzky-Golay filter or the order and length of the polynomial have to be adjusted appropriately as these affect the accuracy and range of curvature values obtained [72].…”

Assessment of the Evolution Equation Modelling approach for three-dimensional expanding wrinkled premixed flames

“…For a cylindrical-in-average or spherical-in-average turbulent flame, the mean turbulent velocity S T can be computed as [4,14,1] …”