NDLI: Numerical Investigation of Abradable Coating Wear Through Plastic Constitutive Law: Application to Aircraft Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Legrand, Mathias Pierre, Christophe
Copyright Year	2009
Abstract	In the field of turbomachines, better engine performances are achieved by reducing possible parasitic leakage flows through the closure of the clearance distance between blade tips and surrounding casings. Together with new technologies involving higher casing conicity for improved compression rates, direct contact is now considered as part of aircraft engines normal life. In order to avoid possibly catastrophic scenarios due to high contact efforts between the rotating and static components, implementation of abradable coatings has been widely recognized as a robust solution offering several advantages: reducing potential damage to the incurring blade as well as adjusting operating clearances, in-situ, to accept physical contact events. Nevertheless, the process of wear undergone by abradable coatings is not well understood and its consequences are still under investigation. In the present work, its macroscopic behavior is numerically approximated through a piecewise linear plastic constitutive law which allows for real time access to the current abradable layer profile. First results prove convergence in time and space of the proposed approach and show that the frequency content of the blade response is clearly affected by the presence of abradable coatings. It seems that opening the clearance between the blade tip and the casing during wear leads to large amplitudes of motion far from the usual linear conditions provided by the well-known Campbell diagrams.
Sponsorship	Design Engineering Division and Computers in Engineering Division
Starting Page	907
Ending Page	916
Page Count	10
File Format	PDF
ISBN	9780791848982
DOI	10.1115/DETC2009-87669
e-ISBN	9780791838563
Volume Number	Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
Conference Proceedings	ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Language	English
Publisher Date	2009-08-30
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Compression Blades Wear Clearances (engineering) Turbomachinery Aircraft engines Coatings Damage Leakage flows Constitutive equations Engines
Content Type	Text
Resource Type	Article

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