As for strong three-dimensional flow in centrifugal/oblique flow compressor rotor blade passages

the two-dimensional blade profiles were optimally designed in three-dimensional environment. The efficiency of centrifugal/oblique flow compressor calculated by the Denton viscous volume force method was obviously higher

and the problem was solved by modifying the viscous dissipation in the energy equation. Then

optimization design software of two-dimensional blade profiles was built by combining the modified flow field calculation module with the parallel genetic algorithm. The software was used for designing tip profiles of centrifugal impeller and oblique flow impeller. The mass flow and pressure ratio of these two optimized impellers are very close to objective values

and the efficiency in whole working range is significantly improved. At the design point

the efficiency of centrifugal impeller is improved from 0.938 to 0.947

and the efficiency of oblique flow impeller is improved from 0.899 to 0.918.