On Hydraulic Property of Vortex Flow Dropshaft with Contraction

Abstract

Hydraulic characteristics of vortex flow dropshaft with contraction which is aimed to deal with energy dissipation and deaeration adequately are treated. Through the experiment, it is clarified that this structure has the effect of diminishing air entrainment. Next, free surface swiring flows passed through contraction are modelled and analyzed. The swirling flows are governed by the two nondimensioal numbers, the circulation number and the Froude number. Some results of practical use are also presented.