A study of nonlinear vibrations in a frictionally damped turbine bladed disk with comprehensive modeling of aerodynamic effects

Petrov, E P, Zachariadis, Z- I, Beretta, A and Elliott, R (2013) A study of nonlinear vibrations in a frictionally damped turbine bladed disk with comprehensive modeling of aerodynamic effects. Journal of Engineering for Gas Turbines and Power, 135 (3). 032504. ISSN 0742-4795

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Abstract

A new effective method for comprehensive modeling of gas flow effects on vibration of nonlinear vibration of bladed disks has been developed for a case when the effect of the gas flow on the mode shapes is significant. The method separates completely the structural dynamics calculations from the significantly more computationally expensive computational fluid dynamics (CFD) calculations while providing the high accuracy of modeling for aerodynamic effects. A comprehensive analysis of the forced response using the new method has been performed for a realistic turbine bladed disk with root-disk joints, tip, and under-platform dampers. The full chain of aerodynamic and structural calculations are performed: (i) determination of boundary conditions for CFD, (ii) CFD analysis, (iii) calculation of the aerodynamic characteristics required by the new method, and (iv) nonlinear forced response analysis using the modal aerodynamic influence matrix (MAIM). The efficiency of the friction damping devices has been studied and compared for several resonance frequencies and engine orders. Advantages of the method for aerodynamic effect modeling have been demonstrated. 2013 by ASME.

Item Type: Article
Keywords: Aerodynamics Computational fluid dynamics Flow of gases Structural dynamics Turbine components Turbomachine blades
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
T Technology > TJ Mechanical engineering and machinery > TJ0266 Turbines. Turbomachines (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL0500 Aeronautics. Aeronautical engineering
Depositing User: Yevgen Petrov
Date Deposited: 04 May 2015 07:25
Last Modified: 04 May 2015 07:25
URI: http://sro.sussex.ac.uk/id/eprint/53861
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