RESEARCH OF 3D DESIGN METHOD ABOUT BLADES OF HIGH LOADED VANELESS CONTRA-ROTATING TURBINE

摘要

A new 3D profiles design model basing on S1 surfaces and according with the actual three-dimensional flows behavior in machinery, has been presented in the paper in order to design the rotor blades of supersonic highly loaded vaneless contrarotating turbine (VCRT) with large meridional channel divergence angle. The basic principle of 3D profiles design has been introduced and the high pressure rotor of supersonic highly loaded VCRT with exit Mach number 1.33 and meridional channel divergence angle 37.3° was designed. The results of 3D numerical simulation indicated that not only the distribution of dynamic parameters is well-proportioned no separation flows in VCRT but also its stagnation efficiency reaches 92.3%. The results of CRT design showed that the 3D profiles design method is more precise and effective than conventional 2D cylinder method for turbine blades with large meridional expansion channel and sophisticated streamlines because the 3D characteristic of flows are considered well.