Response of V Flame to the Harmonic Oscillations of Coupled Velocity and Equivalence Ratio

In this paper the behavior of inverted conical flame in respect to the coupled perturbation of velocity and equivalence ratio has been investigated. Linearized Gequation is utilized to define the flame dynamics. Burning velocity of a premixed mixture plays an important role in flame dynamics. Fluctuation of burning velocity due to equivalence ratio oscillation is derived. For this purpose an empirical model which includes the properties of a premixed mixture is used. Four governing dimensionless groups emerge in flame dynamics. Beside two well-known dimensionless groups, reduced frequency and the ratio of burning velocity to the mean axial velocity ,, two others dimensionless groups emerge from the empirical modelof burning velocity and the correlating coupled velocity and equivalence ratio. This analysis introduces a new parameter to study the effects of operating conditions of flame which is a function of introduced dimensionless groups. The effects of fuel type, burner geometry, and equivalence ratio are studied .

کلیدواژه ها:

velocity ، equivalence ratio ، flame instability