Evaluation of the Strength of Ceramic Radial Turbine Rotors

摘要

The development of turbine rotors that are subjected to high temperature and centrifugal force is one of the most difficult development problems for ceramic parts used for ceramic gas turbines in passenger cars. One of the authors has attempted to evaluate the strength of a small silicon nitride turbine rotor on the basis of 3-point bar breaking strength using the Weakest Link Theory. In this report, a bar breaking test was conducted on a test piece cut out of the actual rotor. A spin strength evaluation was then attempted on the basis of the test results. After continual analysis of causes and improvements in the rotors that fail at a spin speed less than the predicted speed, a few insights have been gained that will contribute to the development of the ceramic radial turbine rotor and are shared in this report. (ERA citation 10:046710)