Abstract
Hydraulic characteristics of vertical dropshaft with tangential vortex-inlet are treated. First, an analytical solution of a freesurface swirling flows in vertical dropshaft is examined through the comparison of experimental results. With the analytical solution, the relation among momentum flux, head, and discharge is discussed. This structure is certified to be effective to high drop disposal. Also, through hydraulic model experiments, suitable volume of a stilling chamber connected to a dropshaft is proposed as a function of head and discharge.
