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Modelowanie matematyczne przelewu burzowego...

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Mathematical Modeling of Storm Overflow with a Cylindrical Vortex Regulator

Abstract

A simulation of the functioning of a modem overfall with a cylindrical vortex regulator on a combined sewage system was conducted in this work. In a cylindrical vortex regulator, liąuid flows into the device through a connector tangent to the cylinder generator. From this, the liąuid receives a vortex motion, which is maintained throughout the entire chamber width all the way to an out-let hole on the cylinder head. In the motion, peripheral speed is increased when approaching the cylinder axis. Because of the centrifugal force in the vortex chamber, the pressure decreases towards its axis until it reaches an ambient pressure on the air core surface. The air core being generated has acrucial influence on the throttling efficiency of the device. The atomized liąuid in the outflow creates a cone with the angle of flarę y.

For the modelling of storm overflow activity a combined drainage area of F = 60 ha was suggested. The overfall was loaded with sewage and wastewater. A typical, triangular hydrograph of the wastewater inflow to the storm overflow was applied here. The given hydraulic model of storm overflow activity includes a series of characteristic, occurring in seąuence phases of fill-ing and emptying of the overfall chamber. The phases were distinguished with the description of boundary conditions in reference to the precisely determined rangę of variables during the fillings and flows. On the basis of the formulated hydraulic and mathematical models of the storm overflow activity, a Computer programme for the numerical simulation of the functioning of the aforemen-tioned overflows was developed.