This paper presents numerical simulations of sanding systems for tramway cars. For this, the DPM (discrete phase method) model as included in ANSYS FLUENT is employed in order to track the particles in the course of the sanding process. Various physical phenomena play a role for the accuracy of the simulation results. Among them, the particle-wall interaction is crucial due to the rotation and aspherical nature of the sand particles leading to an irregular behavior of the particles before and after the wall impingement. A stochastic sub-model was implemented into ANSYS FLUENT via user-defined functions and validated against experimental data. This sub-model allowed to optimize the geometry of the sanding system, leading to a stronger focussing of the sand jet as it leaves the outlet part of the sand pipe. Tests of optimized geometry variants in simulations incorporating realistic boundary conditions showed significant improvements in terms of the effective mass fraction of the sand.
Optimization of a sanding system for a tramway car by numerical simulation of the sand-air two-phase flow
Optimierung eines Sandstreusystem für eine Straßenbahn mittels numerischer Simulation der zweiphasigen Sand/Luft-Strömung
2011
11 Seiten, 16 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
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