The Flow around Turbine Type Impellers

Abstract

To make clear the flow around agitated turbine impellers having varying blade width, tomographic observations and measurements were carried out with a rotating camera and a plane-light source. The following results were obtained. 1) The flows (helical flow etc.) found in the fanturbine were also observed in all the turnines used here. 2) The shear rate and angular momentum in the region of discharged helical flow were greater than in other region. 3) The power consumed in the impeller region was 16~36% of power input. But the rate of energy dissipation per unit volume in the impeller region was 10~20 times as much as the rate in vessel. The rates in impellers of 1/5 (B: width, D: diameter of impeller) were greater than in other impellers. 4) A model of flow profile in the helical flow was proposed. © 1982, The Society of Chemical Engineers, Japan. All rights reserved.