Abstract
For practical application of high carbon number biofuel, experiments of propanol isomers and propane turbulent premixed flame using OH-PLIF measurement were performed in a high pressure environment. The local flame surface density, Σ_<local>, for each fuel was analyzed from instantaneous turbulent flame images of cross-section. The results of Σ_<local> analysis indicated differences of intrinsic flame instability for 1-propanol, 2-propanol and propane. In addition, numerical simulations of propanol and propane laminar premixed flames using CHEMKIM-PRO were carried out to clarify the relationship between chemical reaction and flame instability. It was presumed that turbulent flame structure is affected by the diffusive thermal effects related to concentrations of the intermediate species, C_2H_2 and C_2H_4, depending of fuels and differences in dissociation reaction pathway.
