FOD simulation on ceramic gas turbine blade

摘要

Foreign object damages (FODs) is the important subject in ceramic gas turbines (CGTs). In the test runs of CGT, it was often reported that some remarkable damages appeared in the trailing part of the rotor blade, where foreign particles hardly impacted. In order to understand this type of damage behavior, a finite-element analysis on the particle impact was carried out under the elastic assumption. The numerical analysis on 2D wedge model showed that interaction of the stress waves by the impact in the leading part could actually produce in the trailing part tensile stresses far beyond the material strength. In the analysis of 3D blade model, the maximum stress locations on the blade showed good correspondence to those of damaged areas observed in the particle impact experiment As a result we could indicate that the foreign particle impact in the leading area of the blade was possible to cause damages in the trailing area (structural damage) as well as the impact site (local damage).