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research-article

Thermo-Mechanical Modeling of Abradable Coating Wear in Aircraft Engines

[+] Author and Article Information
Florence Nyssen

Post-doctoral fellow, École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
florence.nyssen@polymtl.ca

Alain Batailly

Assistant Professor, École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
alain.batailly@polymtl.ca

1Corresponding author.

ASME doi:10.1115/1.4041647 History: Received June 27, 2018; Revised September 04, 2018

Abstract

In modern turbomachine designs, the nominal clearances between rotating bladed-disks and their surrounding casing are reduced to improve aerodynamic performances of the engine. This clearance reduction increases the risk of contacts between components and may lead to hazardous interaction phenomena. A common technical solution to mitigate such interactions consists in the deposition of an abradable coating along the casing inner surface. This enhances the engine efficiency while ensuring operational safety. However, contact interactions between blade-tips and an abradable layer may yield unexpected wear removal phenomena. The aim of this work is to investigate the numerical modeling of thermal effects within the abradable layer during contact interactions and compare it with experimental data. A dedicated thermal finite element mesh is employed. A weak thermo-mechanical coupling is assumed: thermal effects affect the system mechanics, but the mechanical deformation of the elements has no effect on temperatures. Weak coupling is well appropriated in the case of rapid dynamics using small time step and explicit resolution schemes. Moreover, only heat transfer by conduction is considered in this work. To reduce computational times, a coarser spatial discretization is used for the thermal mesh comparing to the mechanical one. The time step used to compute the temperature evolution is larger than the one used for the mechanical iterations since the time constant of thermal effect is larger than contact events. The proposed numerical modeling strategy is applied on an industrial blade to analyze the impact of thermal effects on the blade's dynamics.

Copyright (c) 2018 by ASME
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