Session: 33-03 Modeling deposition and erosion

Paper Number: 124018

124018 - Modeling Stochastical Particle Rebound Based on High Velocity Experiments 

Solid Particle Erosion is a major deterioration process which contributes to performance deterioration of modern axial compressors. The prediction of this deterioration process requires the correct computation of particle movement through the machine and their resulting impacts on the affected components. Especially for particles with high Stokes number the movement is determined mainly by the particle wall interaction, which is described by so called coefficients of restitution. Today, they are derived from experiments featuring high particle velocities and target materials which are representative for turbomachinery applications. With such a dataset a particle wall model is optimized for the velocities which occur in axial compressors. The particle wall model features the stochastics of the rebound. The procedure for evaluating the stochastic of the rebound is demonstrated by evaluating the experimental spread. The model is implemented into a CFD software and validated against measured data. Its application to a typical test specimen in a sand blast facility underlines the importance of the stochastics of the rebound, which is often neglected in particle wall interaction. Moreover, the numerical study shows requirements for the test specimen and its positioning in the experimental setup which are a prerequisite for the derivation of the coefficients of restitution using shadowgraphy equipment.

Presenting Author: Jan Hartmann University of Stuttgart

Presenting Author Biography: Jan Hartmann finished his master of science in mechanics at the TU Darmstadt in 2019 and started working in the field of erosion during his master thesis. After joining the institute of aircraft propulsion systems as a PhD Student in 2020 he focuses on the research field of compressor erosion. His research involves numerical methods to predict particle movement and the resulting deterioration processes that occur in turbomachines.

Authors:

Jan Hartmann University of Stuttgart
Christian Koch Institute of Aircraft Propulsion Systems
Stephan Staudacher Institute of Aircraft Propulsion Systems