Showing papers by "Congrès International d'Architecture Moderne published in 1994"

Anti-stall tip treatment means

Abstract: To delay the onset of stall conditions at the tips of the blading of axial-flow, mixed-flow and axial-centrifugal compressors, at the tips of the annular arrays of blading anti-stall tip treatment means are provided at least at one said array (2) comprising an annular cavity (3) communicating with the flow path through the compressor through slots (5) formed by annular grid of ribs (4). The slots (5) provide communication between the cavity (3) and the flow path (7, 8) both upstrem of and axially coincident with the array of blades (2). The ribs (4) are inclined relative to the radial direction at an angle (ζr) of 30° to 50°. The pitch (t) of the ribs and the slot width (δs) between the ribs are in the ratio of 1.5 to 2.0. The rib radial projection height (h) and the slot width are in the ratio of 1.1 to 1.8. The axial length (L) of the grating of ribs and the blade tip chord axial projection (b') of said array of blades (2) are in the ration of 0.5 to 1.5. The cavity height (H) outwardly of said ribs and said axial length of the grid are in the ratio of 0.2 to 0.5.