Abstract
Direct numerical simulations of ignition and propagating of n-heptane/air premixed flame in two-dimensional homogeneous isotropic turbulence are conducted to investigate the effects of turbulence and fuel species on ignition and propagation process. In the ignition process, eddies stretch the high temperature region and disturb its evolution. Compared with hydrogen/air mixture, the influence of turbulence on ignition is weak for n-heptane/air mixture. In the propagation process, strong eddies prevent propagating of the flame, and the flame propagates along the edge of eddies. The shape of flame in n-heptane/air mixture is more complex compared with that in hydrogen/air mixture. The heat release rate of n-heptane/air turbulent premixed flame is several times of that of one-dimensional laminar flame.
