STUDY OF A STILLING BASIN WITH A SWIRLING FLOW

A. BRAKENI, A.P. GOURYEV, M.M. CHUMICHEVA, O.V. MAREEVA, A.S. VERHOGLYADOVA

Abstract


The stability of a rectilinear axis dissipator can be evaluated on the basis of the study of the hydrodynamic forces, in terms of pressure and pressure fluctuation acting on the raft downstream.

This article analyzes the operation of existing designs of devices for dissipating excess energy from water discharges with regard to the hydraulic structures. The simplest and most widely used design for dissipating flow energy are straight-axis, prismatic or trapezoidal stilling basins, but the main drawback of the latter is high material consuming and the requirement for ensure a uniform distribution of unit flows in the inlet section, which makes them ineffective for circular bottom spillways.

A new model is proposed in this article with the aim of minimizing the agitation of the stilling basin flow in the form of a spiral by shortening the length of the basin, and simultaneously creating the possibility of a planned intensive spreading of flow in the outlet section of the water basin, allowing it to be used when a multiple widening of the flow behind the spillway is required. This model not only promotes a more stable flow in the area near the dissipator, but also dissipates the energy of streams with any hydraulic characteristics.

Keywords


Enlarged dissipation basin, flow disturbance, energy dissipation, swirling flow, excess flows.

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