Flow in the Blade Passage of Axial-Flow Fan.

Abstract

In this paper, three dimensional velocity distributions were measured using a hotwire probe in the moving blade passage of a single stage axial-flow blower with stationary blade ahead of fan wheel. Measuring points are 6 positions in the axial direction, 11 positions in the radial direction and 18 positions in the circumferential directions per one pitch of moving blade passage. Rotational speeds were 600 rpm, 1500 rpm and 2400 rpm and operating conditions were three points on the decreasing inclination zone of the pressure-discharge curve. Steady velocity distributions were considered in this paper. Discussions were made on the flow leakage through tip clearance, variations of velocity distributions with radii, and velocity distributions and flow turning angle at the outlet of blade passage.