Hot-Wire Measurements Inside a Centrifugal Fan Impeller

Journal article, 1989

Measurements of the three mean velocity components and five of the Reynolds stresses have been carried out in the blade passage of a centrifugal fan impeller. The impeller was of ordinary design, with nine backward curved blades, and all measurements were carried out at the design flow rate. The mean velocity measurements show that the flow can be characterized as an attached flow with almost linearly distributed velocity profiles. However, in a region is created. From the turbulence measurements it can be concluded that relatively low values of the turbulent stresses are predominating in the centre region of the channel. Close to the walls higher values of the normal as well as shear stresses are noted.