Design Optimization for Double-T Root and Rim of Turbine Blade with Three-Dimensional Finite Element Method

Abstract:

As the main bearing part in a turbine blade, the root carries most of the loads of the whole blade. The improvement of the root structure can be used to enhance the operation reliability of steam turbine. The research on design optimization for double-T root and rim of a turbine blade was conducted by three-dimensional finite element method. Based on the APDL (ANSYS parametric design language), a multi-variable parametric model of the double-T root and rim was established. Twelve characteristic geometrical variables of the root-rim were optimized to minimize the maximum equivalent stress. The optimal structure of the double-T root-rim is obtained through the optimization. Compared with the original structure, the equivalent stress level of the root and rim has a significant reduction. Specifically, the maximum equivalent stress of root and rim reduces by 14.25% and 13.59%, respectively.

• Periodical: Applied Mechanics and Materials (Volumes 215-216)
• Pages: 239-243
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.215-216.239
• Online since: November 2012
• Authors: Ming Hui Zhang, Di Zhang, Yong Hui Xie
• Keywords: Design Optimization, Double-T Root and Rim, Equivalent Stress, Finite Element Analysis (FEA)

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