Abstract: Based on the analysis of foreign object damage on certain aero engine compressor blades,the distribution regular pattern of the damage type, notch size and position along the axial and radial directions of the compressor is revealed.The results indicate that the notch is the main type of four typical damages which include notches,tears,pits and curls. The damage rates on low pressure compressor blades are relatively high, and they have a downward trend with the increase of compressor stages, while the damage types on high pressure compressor blades are quite different, because of many changing factors such as blade material and impact energy. Furthermore, there is no obvious difference in the distribution of notch sizes along the axial direction of compressors, but their distribution characteristics are quite different between high and low pressure compressors, the damage location only has a significant correlation with the depth sizes. As far as the first blade of the low pressure compressors is concerned, most of notch damages are located more than 80% of the height above the blade root, there is no significant correlation between the notch position and the size, but there is a linear correlation between the notch width and depth.

Key words: aero engine, compressor blade, damage characteristics, foreign object damage, statistical analysis