AXIAL-FLOW COMPRESSOR Russian patent published in 1999 - IPC

FIELD: manufacture of axial-flow compressors. SUBSTANCE: blade backs of guide apparatus of compressor stage have cavities (recesses) which extend at root sections of blades from 85 to 100 % of chord from root section to center portion of blades at reduction of depth and extension according to the linear laws converging to point on blade trailing-edge piece which corresponds to 23% of blade height. Maximum depth of recess at root sections of blades is found at points corresponding to 85% of blade chord length and is equal to 40 % of relative thickness "c" of blades at this point. In longitudinal sections of blades, cavity has form of rectangular recess. EFFECT: enhanced efficiency of compressor due to reduction of effect of eddy flow on main flow of working medium. 3 dwg