Static fracture and modal analysis simulation of a gas turbine compressor blade and bladed disk system

Abstract

This paper presents a methodology for conducting a 3-D static fracture analysis with applications to a gas turbine compressor blade. An open crack model is considered in the study and crack-tip driving parameters are estimated by using 3-D singular crack-tip elements in ANSYS . The static fracture analysis is verified with a special purpose fracture code (FRANC3D). Once the crack front is perfectly defined and validated, a free vibration study is conducted by analyzing the natural frequencies and modeshapes for both a single blade and bladed disk system. Taking advantage of high performance computing resources, a high fidelity finite element model is considered in the parametric investigation. In the fracture simulation, the influence of the size of a single edged crack as well as the rotational velocity on fracture parameters (stress intensity factors and J-Integral) are evaluated. Results demonstrate that for the applied loading condition, a mixed mode crack propagation is expected. In the modal analysis study, increasing the depth of the crack leads to a decrease in the natural frequencies of both the single blade and bladed disk system, while increasing the rotational velocity increases the natural frequencies. The presence of a crack also leads to mode localization for all mode families, a phenomenon that cannot be captured by a single blade analysis.

Numerical Simulation of 3-D Internal Crack Propagation in Rock under Semi-circle Bending

“…The propagation process of the crack initiation to the bottom of the specimen in the symmetrical loading model of Group-A was selected for quantitative analysis. Studies [32] have shown that the solution is more accurate when the median extension defaults to 15%~20% of the crack radius and the template radius defaults to 10% of the crack radius. In this section, the median extension is set to 15% of the crack radius, which is 0.75 mm.…”

Harmonic response analysis of an impeller of a gas turbine engine which modelled by using high entropy alloy materials

“…Finite element analysis is used extensively to simulate rotating machinery (Rao, 2010;Kumar, 2011). Fernandes et al, (2016) presented a finite element model for performing a 3-D static fracture analysis of a gas turbine compressor blade in ANSYS software. Virdi et al, (2017) designed and analyzed an impeller in Catia and ANSYS, respectively.…”

Structural reliability analysis and uncertainties‐based collaborative design and optimization of turbine blades using surrogate model

“…Blades are important components in power and energy equipment. The formability of material and the complexity of structural shape are two key factors during the design and manufacture process of blades . In practical engineering, blades are often manufactured as smooth curved surface shapes to satisfy the performance requirements for harsh environment.…”

“…The formability of material and the complexity of structural shape are two key factors during the design and manufacture process of blades. [4][5][6] In practical engineering, blades are often manufactured as smooth curved surface shapes to satisfy the performance requirements for harsh environment. These smooth curved surface shapes can generate wake flow field, secondary flow, and boundary layer separation.…”