EFFECTS OF Da AND Re ON PREMIXED FLAME SPEED

Abstract

An expression for premixed turbulent flame speed is presented, in which Reynolds number R_λ based on turbulent microlength scale λ and turbulent intensity ú, and Damkohler number Da defined as the ratio of characteristic residence time of turbulent flame to that of laminar flame, are considered to be the two controlling parameters. The constants involved in that expression are detennined by regression with the available experimental data. It is found that the ratio of turbulent flame speed to laminar flame speed (V_s /V_l ) increases with R_λ linearly only when Da is kept fixed.

Keywords:

• Premixed flame speed
• Damkohler number
• characteristic residence time
• Reynolds number