Abstract
One-dimensional integral model for the non-uniform scalar variable profile with low frequency equivalence ratio oscillation has been developed. When the equivalence ratio of premixed mixture is oscillated, the gradient of fuel concentration in the upstream side of the reaction zone and of temperature gradinet in the downstream side of the reaction zone varies. It results in the additional fuen and het transfer to/from the reaction zone by the molecular diffusion of fuel and heat. When excess fuel is supplied from the upstream side and the excess heat is supplied from the downstream side, the flame is intensified. On the other hand, the flame is weakened when the fuel and heat are lost from the flame zone. When one is supplyed and the other is lost, both effects are canceled each other and no variation occurs at the flame zone. These results indicates that the equivalence ratio oscillation of premixed mixture plays an important role for the premixed flame dynamics.
