PROPOSED CONTROL OF COMPRESSOR STALL BY PRESSURE PERTURBATION AND BLADE DESIGN.

Abstract

A method is proposed for suppressing stall and stall flutter in an axial flow compressor by injecting upstream perturbations. Evidence from another fields show that the addition of particular noise perturbations to a bifurcating system can greatly reduce the entropy increase and yield power spectra with several pronounced frequency peaks. We consider problems in achieving downstream perturbations having a spectrum consistent with stability requirements under perturbations for the non-linear blade dynamics. The requirements may be modified by blade design parameters. The controlled injection of turbulence into the upstream flow has been shown to have the desired effect of suppressing laminar separation. Stall suppression devices for fans based on the recirculation of turbulent tip region fluid are successful but are not well understood. The suggestions of this paper should provide a hypothetical basis for the design of these devices and provision of a modified endogenous recirculation procedure. Show more