セラミックス製ガスタービン翼の固体粒子衝突による衝撃損傷およびエロージョン評価

抄録

A practical computing system was developed to analyze the impact damage and erosion of the ceramic gas turbine components in the gas flow mixed with solid particles. This system includes flow analysis in the blade row supplemented by boundary layer calculation, particle trajectory analysis, impact fracture and erosion analysis.
The fracture analysis impacted by solid particles is based on our proposed method which treats the damage of ceramics as the stiffness reduction. This method was implemented into a general purpose dynamic stress analysis program, DYNA3D. The validity of our proposed method was verified by the results of numerical simulation regarding the impact tests using ceramic plates and some spherical particles.
As for the erosion analysis, an empirical equation obtained from the erosion tests at elevated temperatures was implemented into the code for the analysis of blade erosion. In many advanced fuels, solid particles may be formed as by-products of combustion. Therefore the problem of solid particle erosion has great importance in industrial gas turbines viewed from the aerodynamic performance.