Research of 3D design method for rotor of supersonic high loaded contra-rotating turbine with large expansile meridional channel

A new 3D profile design method based on Si surface and more according with the true 3D flows in machinery, is presented in the paper in order to design the rotor blades of supersonic highly loaded contra-rotating turbine (CRT) with large meridional flowpath divergence angle. The basic principle of 3D profile design is introduced in detail and the high pressure rotor of supersonic highly loaded CRT with exit Mach 1.33 and meridional channel divergence angle 37.3° is designed. The results of 3D numerical simulation indicate that not only the distribution of dynamic parameters is well-proportioned without separate flow in CRT but also its stagnation efficiency reaches 92.57%. The results of CRT design show that the 3D profile design method is more precise and effective than the conventional 2D cylinder method for turbine blades with large expansile meridional channel and sophisticated streamlines because the 3D characteristics of flow are considered well.