Rotating stall in axial flow compressors
Abstract
If a simple theory of rotating stall in turbocompressors should be devised, the stall cells could be described as nothrough flow bubbles and their speed of rotation deduced from the static pressure rise across the nonstalled blades. The radial equilibrium condition of the bubbles defines the critical flow rate at which a rotating stall may become steady. A calculation of the pressure rise in a solid body blading, friction and off design losses being taken into account, gives a correct description of the phenomenon. The steady flow regime lasts until, at high pressure ratio, the stall limit is not attained; the rotating stall regime corresponds to low flow coefficients and both regimes are stable in an intermediate flow coefficient range. In the case of a free vortex blading, the theory shows that the rotating stall cells extend over the blade span only, at least when the hubtotip ratio of the compressor is small.
 Publication:

In Von Karman Inst. for Fluid Dyn. Unsteady Flows in Axial Flow Compressors 43 p (SEE N7927429 1834
 Pub Date:
 1970
 Bibcode:
 1970ufaf.vkif.....F
 Keywords:

 Aerodynamic Stalling;
 Rotating Stalls;
 Rotor Aerodynamics;
 Turbocompressors;
 Boundary Layer Separation;
 Cascade Flow;
 Cavitation Flow;
 Critical Flow;
 HotWire Anemometers;
 Radial Flow;
 Fluid Mechanics and Heat Transfer