An advanced computational fluid dynamics (CFD) modelling design method using a numerical viscous/inviscid coupling procedure has been developed. The method is employed to analytically evaluate the performance of various combinations of high pressure vaneaxial fan rotor, stator and diffuser geometries. The procedures used in the CFD design method ensure a free-vortex blading, a separation-free profile, and a configuration with optimum rotor-stator interaction. Two test fans which have aerodynamic performance and geometrical characteristics close to the desired fan operating range are used to provide code verification and empirical information for the total design effort. A design example is presented. Aerodynamic and aeroacoustic test data will be presented in a later paper.

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