In order to optimize the structure of the best matching swirler in the central staged combustion chamber

13 kinds of swirler structures were obtained by changing the rotation direction and installation angle of the cyclone

using the steady state approximation method of the fuel.Through numerical simulation analysis

the effect of the swirler structure on lean blow-out of the central staged combustors was investigated.The results show that

the shape of temperature field in the main combustion zone gradually sag during the lean blow-out process

the high temperature zone still exists after flameout occurred

and the central recirculation zone of axial and radial size gradually increases.As the installation angle of the first and second blade increases

the lean blowout fuel air ratio decreases

and that for the second blade decreases greater.With an increase in the main combustion stage blade angle

the lean blowout gas oil ratio increases gradually.The first and second stage cyclone has different swirling directions.When the swirling direction of the main combustion stage is the same as that of the second stage

the lean blow-out performance is better.The best structure for the cyclone is that the first and second stage has the opposite swirling direction and the main combustion stage has the same swirling direction with the second stage

meanwhile

the installation angle of the first

second and main combustion stage is 70°

45° and 60°

respectively.The lean blowout test results are in good agreement with the calculated results.