Destruction and erosion of materials in high-speed flows

Figure 1. (a) – scheme of the experimental setup 1 – compressor room, 2 – air flow acceleration pipe, 3 – solid particles feeder device, 4 – sample inlet device, 5 – holder with mounted samples, 6 – working chamber; (b) – working chamber view. 

Solid particle erosion tests are performed in a modified small-scale wind tunnel. Material samples are tested a two-phase flow (air mixed with abrasive particles). The abrasive particles were accelerated by an air flow. The scheme of the utilized experimental setup is shown in figure. The experimental setup provides the ability to control all key parameters of the experiments: particle velocity (40 – 300 m/s and more), particle concentration, and duration of the experiment.

Solid particle erosion inevitably leads to surface degradation which is also a source of information about material behavior in conditions of erosion. We register sample mass degradation, surface roughness change, and carry out microstructural analysis of the samples. This provides possibility to determine threshold characteristics of the fracture process.

Figure 2. First stage comp of aero-engine axial compressor (PZL-10W). (a), blade (b) and sample after erosion tests (c).