Abstract
FACE-C gasoline/air and TPRF (51.6 vol. % iso-octane, 21.5 vol.% n-heptane and 26.9 vol.% toluene)/air mixtures corresponding to the same RON of 85 were characterized in terms of determining their burning rates in a fan stirred turbulent vessel and filmed using high speed dual Schlieren imaging. Moreover, Mie scattering planar laser tomography was employed to characterize the variations of flame morphology induced by the coincident existence of different turbulent length scales and the susceptibility to develop cellular structures at elevated pressures (through the Darieus-Landau instability). Measurements were performed in a well-controlled environment of initial pressures 0.1, 0.5 and 1.0 MPa at a fixed initial temperature of 358 k. These measurements were conducted at a range of measured turbulence intensities from 0.5 to 2.0 m/s. The enhancement of turbulent flame speed S T as a function of turbulent intensity was sized. The absence of bending regime was accounted for based on the size of the vessel and limited range of turbulent intensities investigated in the present work.