... lead to the generation of Tyler/Sofrin modes. Further studies on acoustic modes in axial compressors were carried out by Camp [ 12 ], Cooper and Peake [ 13 ], Enghardt et al. [ 14 ], Tsuchiya et al. [ 15 ], Cooper et al. [ 16 ] and Sutliff [ 17 ]. Hellmich and Seume [ 18 ] detected nonrotational speed...