Model of the hydrodynamic loads applied on a rotating halfbridge belonging to a circular settling tank

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Dascalescu, A.E.^1 ; Lazaroiu, G.^1 ; Scupi, A.A.^2 ; Oanta, E.^2

Politechnica University of Bucharest, Faculty of Power Engineering, 313 Splaiul Independentei, Sector 6, Bucharest

060042, Romania^1

Constanta Maritime University, Faculty of Naval Electro-Mechanics, 104 Mircea cel Batran Street, Constanta

900663, Romania^2

关键词: Circular settling tank;    Distributed forces;    Hydrodynamic forces;    Hydrodynamic loads;    Reynolds-Averaged Navier-Stokes;    Transporting pipes;    Turbulent kinetic energy;    Volume of fluid model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/4/042008/pdf
DOI  :  10.1088/1757-899X/145/4/042008

来源: IOP

【 摘 要 】

The rotating half-bridge of a settling tank is employed to sweep the sludge from the wastewater and to vacuum and sent it to the central collector. It has a complex geometry but the main beam may be considered a slender bar loaded by the following category of forces: concentrated forces produced by the weight of the scrapping system of blades, suction pipes, local sludge collecting chamber, plus the sludge in the horizontal sludge transporting pipes; forces produced by the access bridge; buoyant forces produced by the floating barrels according to Archimedes' principle; distributed forces produced by the weight of the main bridge; hydrodynamic forces. In order to evaluate the hydrodynamic loads we have conceived a numerical model based on the finite volume method, using the ANSYS-Fluent software. To model the flow we used the equations of Reynolds Averaged Navier-Stokes (RANS) for liquids together with Volume of Fluid model (VOF) for multiphase flows. For turbulent model k-epsilon we used the equation for turbulent kinetic energy k and dissipation epsilon. These results will be used to increase the accuracy of the loads' sub-model in the theoretical models, e. the finite element model and the analytical model.