A simple method for geometry definition of radial compressors

During the pre-design stage of radial flow compressors for gas turbine or industrial applications, it is necessary to carry out an aero-thermodynamic analysis to define flow properties and from those to define the compressor geometry, i.e. inlet and outlet areas, volute, impeller profiles, etc.. It is well known, that there is no unique design process or method for this kind of turbomachine, so several assumptions have to be made according to the task or application that the compressor is going to carry out. Then, based on those assumptions, the compressor's geometry will be defined. Unfortunately, there is not any method fully explained published in the open literature for designing. In this work, a simple method is presented and applied to calculate the geometry of a radial compressor (volute, impeller, etc.) based on the aerothermodynamic analysis.