Methods and apparatuses for avoiding surging phenomena in compressors

Abstract From the Canadian patent

A centrifugal compressor comprising an impeller but not comprising distributor blazing upstream of the impeller a pressure probe and regulator means controlled by the probe and arranged to act on the flow conditions downstream or upstream of the compressor to avoid the risk of surging. The probe is disposed upstream of the impeller of the compressor and being arranged to detect the critical direction of the absolute velocity of the fluid and to mesure the critical value of the radial gradient of the static pressure beyond which the compressor runs the risk of being subjected to surging. The said probe is provided with directional pressure ports situated, at the same distance from the wall …