Nonaxisymmetric compressible swirling flow in turbomachine annuli
Abstract
The behavior of nonaxisymmetric disturbances in compressible swirling flows, typical of those found in turbomachine annuli, is examined using an analysis based on the Clebsch transformation of the equations of motion in reduced flow form. For the flows analyzed, the different types of disturbances (vorticity, entropy, and pressure) interact strongly in the presence of swirl. Numerical examples are presented to show that mean swirl level and mean Mach number can have a strong influence on the downstream evolution of the nonaxisymmetric disturbances. In particular, at high subsonic Mach number in regions of high swirl, nonaxisymmetric disturbances can show oscillations with decreasing amplitude as a function of downstream distance. A simple flow model is also used to examine the static pressure nonuniformities that can occur in one class of these nonaxisymmetric flows. The qualitative behavior described by this (much) simpler model is also deduced from the general analysis.
 Publication:

AIAA Journal
 Pub Date:
 January 1986
 DOI:
 10.2514/3.9227
 Bibcode:
 1986AIAAJ..24...92T
 Keywords:

 Annular Flow;
 Compressible Flow;
 Flow Equations;
 Swirling;
 Turbomachinery;
 Vortices;
 Aerothermodynamics;
 Flow Distortion;
 Mach Number;
 Static Pressure;
 Transformations (Mathematics);
 Fluid Mechanics and Heat Transfer