Coupled Flow Analysis on the Excitation Effect in Annular Enlarged Cascade

In regard to the excitation experiments,time-Accurate numerical stimulation was carried out to investigate the upstream disturbance frequency effect under different incidence in an annular cascade.Combined with experimental results,the disturbance frequency effect on loss coefficient,load factor,and work-loss ratio was discussed.The change of time-space flow structure is the principal cause of the performance improvement.