Abstract: An automatic aerodynamic optimization system for centrifugal compressor impeller is constructed, which is composed of flow field simulations in 3D Navier-Stokes equation methods, grid automatic generations, parameterizations of blade profiles and meridional channels and optimization algorithms of SIMPLE method. It is mainly important that the flow fields are simulated with a certain precision, as to aerodynamic optimization design in this method. The flow field in the Krain impeller is simulated as an examination of flow field simulation accuracy. In construction of the objective functions, the non-design point performance is considered, to achieve the performance optimization in the whole work ranges of the impeller. Two impellers are redesigned using the optimization system. In the whole mass flow ranges at design rotating speed, the efficiency is improved obviously and the pressure ratio keeps nearly unchanged.

Key words: centrifugal compressor, flow field simulation, aerodynamic optimization