A second order exact scaling method for turbomachinery performance prediction

Abstract

A scaling method valid for most turbomachines based on first principles is derived. It accounts for axial and centri-fugal turbomachines with respect to relative gap width / tip clearance, relative roughness, Reynolds number and/or Mach number for design and off-design operation as well. The scaling method has been successfully validated by a va-riety of experimental data obtained at TU Darmstadt. The physically based, hence reliable and universal method is compared with previous, empirical scaling methods.