Pulsed air injection system characterization for stall margin improvement in an axial compressor

Abstract

This paper presents the design and the characterization of a pulsed air injection system on a single stage axial compressor. The goal of this system is to delay the rotating stall onset and to extend the compressor operating range. The proposed control system consists in 20 injection blocks of 2 injectors, allowing to adjust some of the fluidic and geometrical parameters of the injected perturbations. Velocity, flow rate and momentum can be varied on a large range and the injectors can be rotated by 15° steps or replaced to change the yaw angle and the outlet section.