ガスタービン動翼の振動応力解析とばらつきの評価

概要

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In designing a gas turbine blade, the mechanical designer should predict the vibratory stress of the blade taking the variation into account, and evaluate the mechanical strength of the blade. This paper, first, proposes an analysis method for predicting the resonant stress due to the interaction force between the vane and the blade, using 3-D CFD and the modal analysis method based on 3-D FEM. Verification tests of turbine blades are carried out, and the measured frequencies and vibratory stresses are compared to predicted values, and the validity of the proposed method is confirmed. In the second place, a practical method for predicting the variation of the vibratory stress of the blade is proposed, where the response analysis of a whole mistuned bladed disk is carried out, applying the Monte Carlo simulation. From the calculated results, the mistuning characteristics of the gas turbine blade are clarified.
2008-09-20