Combined with the pulsed jet overall control ruler of divergent curved channels

the steady and unsteady characteristics of flow fields in channel under different frequency states were analysed. Results show that the flow characteristics change amplitude is similar along the radial direction under steady control state

and the influence of steady jet suppresses the complex flow phenomenon and linearly changes the flow characteristic of the flow field. Under suitable pulsed jet control state

the influence of pulsed jet on the flow field is presented by changing the fluctuation time-space characteristic of separation vortex

so that the influence amplitude increases along the radial direction

and the decreased magnitude of total pressure loss in the mainstream region is more obvious; meanwhile

the periodic characteristic of the dominant separation vortex is improved significantly

and the flow coherent structure is more orderly.