Characteristics of lean blowout limit for backward step-stabilized flame with centrifugal force effect

Using the centrifugal force effect of a whirl flow through a curved pipe to simulate the working conditions in the rotor combustion system,this thesis investigated the effect of the geometric parameters on lean blowout limit of spray combustion for the backward step flame holder.On the basis of a curved flow channel experiment rig,a backward step flame holder was designed with variable geometric parameters.The geometric parameters include:the height,length and distance between backward step and wall surface.The effect of these three geometric parameters on the lean blowout limit of spray combustion was investigated.Test results indicate that,the height and length have great effect on flame blowout limit.With the increase of the height and length,the lean blowout limit decreases;but the distance between backward step and wall surface has little effect on flame blowout limit.For each backward step flame holder,while centrifugal force effect increases,the flame lean blowout limit is reduced and flameout range is broadened.This research work has laid a foundation for investigation of spray combustion on the rotor combustion system.