Numerical Study on Particles Deposition in the U-bend Ribbed Passage

Abstract

Sand particles accumulation in the internal cooling passage reduces cooling effectiveness of the turbine blades and even affects aviation safety. Discrete phase-CFD simulations of sand particles deposition was performed in the U-bend ribbed passage. The Euler-Lagrange method is used. Reynolds Average Navier-Stokes method was used for the gas phase calculation. The realizable k-e turbulence model and enhanced wall treatment were performed. The discrete phase was solved using Lagrangian with random walk model. A particle deposition model was implemented using user-defined functions. The Reynolds numbers of 30000, 23000 and 15500 were considered. Particles diameters in the range 1-20 microns were considered. The particles deposition distribution of different locations is obtained in present study and the influence of the Reynolds numbers and particle diameters on particles deposition performance is analyzed. Results show that the first row of ribs has a protective effect on the back row of ribs. The increased Reynolds number and increased particles diameter promote the deposition of particles on the wall.

Simulation of Turbulent Flow Structure and Particle Deposition in a Three-Dimensional Heat Transfer Duct with Convex Dimples

“…The experimental curve was better matched with the projected total fouling mass based on the Euler method. Li et al [17] simulated the particle deposition in a ribbed U-shaped curved channel by using the Euler-Lagrange method. The Reynolds averaged Navier-Stokes method was used for the calculation of the gas phase.…”