The influence of gas-particle two-phase flow on the erosion of the blade and shroud of an axial compressor is numerically investigated using CFD(Computational Fluid Dynamics) method. In contrast to the quasi-three dimensional calculations used in the literature, the complete three-dimensional calculation is conducted in this paper to study erosion of blade and shroud and the tip-clearance flow.
For this purpose, three-dimensional compressible turbulent flow code is developed. Code validation is conducted with respect to the various turbulent models(Baldwin-Lomax, k-ω, k-ε, and q-ω model) with the turbulent flat plate and VKI turbine cascade flow.
For the present two-phase three-dimensional flow calculations with gas-particle two-way coupling, the three-dimensional Lagrangian particle tracing technique is developed. For efficiency of computation parallel processing is used.
To further verify accuracy of the code in the case there are gas-particle interactions, the gas-solid particle mixture flow in the JPL nozzle is calculated using the three-dimensional grid and compared with earlier two-dimensional computational results.
Particles passing through the tip-clearance in the DFVLR compressor can impact either on the blade tip or on the shroud after escaping the tip-clearance. It was found that larger particles moved more radially and caused more serious erosion on the blade and shroud.
