Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25Â MPa

A new overall correlation is derived for the Pb0.5 factor, in terms of Masr at different K and this is discussed in the light of previous theoretical studies. The wrinkled flame surface area normalised by the area associated with the turbulent burning velocity measurement, and the ratio of turbulent to laminar burning velocity, ut/ul, are also evaluated. The higher the value of Pb0.5, the more effective is an increased flame wrinkling in increasing ut/ul. A correlation of the product of k and the laminar flame thickness with Karlovitz stretch factor and Markstein number is explored using the present data and those of other workers. Some generality is revealed, enabling the wave length associated with the spatial change in mean reaction progress variable to be expressed by the number of laminar flame thicknesses, and the flame volume to be found.