The Quasi-Steady Design of a Compressor or Pump Stage for Minimum Fluctuating Lift

Abstract

This paper is intended for the designer of rotating turbomachinery who is concerned with the fluctuating forces generated in a turbomachine. The analysis presented is a quasi-steady analysis and its use is justified by a recent paper by Horlock. This analysis indicates that a time-dependent analysis and a quasi-steady analysis for the minimization of fluctuating lift on an isolated airfoil requires identical airfoil geometries. Assuming this agreement holds for a cascade of airfoils, this paper presents the cascade geometry required to minimize fluctuating lift as predicted by the quasi-steady analysis.