THEORETICAL ANALYSIS OF INCOMPRESSIBLE FLOW THROUGH A RADIAL-INLET CENTRIFUGAL IMPELLER AT VARIOUS WEIGHT FLOWS II - SOLUTION IN LEADING-EDGE REGION BY RELAXATION METHODS

摘要

The detailed solution of the flow around the blade nose of a 48inch-diameter radial-inlet centrifugal impeller has been obtained byrelaxation methods for four weight flows. The results are presented in a series of figures showing streamlines and relative velocity contours. Minimum velocity gradients around the blade nose occurred for the weight flow corresponding to a mean angle of attack of -4.6° computed from blade speed and an upstream axial-radial velocity for which blade blockage has been taken into account. A small positive local angle of attack seems desirable for blades with rounded leading edges.