Characteristics and Flow Conditions of a Forced-Vortex Impeller of an Axial Flow Fan

Abstract

This paper deals with an experimental study of a forced-vortex impeller in an axial flow fan without inlet vanes. The impeller used is designed such as to have a forced-vortex flow at the impeller outlet on the assumption that the axial velocity component is uniformly distributed from hub to tip. Not only velocity profiles up- and downstream of the impeller but also theoretical head, loss of head and mean effective radius of the impeller, and lift and drag coefficinets of each blade section are presented.