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2016 | Book

Introduction Read chapter Read first chapter

Loadings in Thermal Barrier Coatings of Jet Engine Turbine Blades

An Experimental Research and Numerical Modeling

Authors: Tomasz Sadowski, Przemysław Golewski

Publisher: Springer Singapore

Book Series : SpringerBriefs in Applied Sciences and Technology

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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About this book

This book discusses complex loadings of turbine blades and protective layer Thermal Barrier Coating (TBC), under real working airplane jet conditions. They obey both multi-axial mechanical loading and sudden temperature variation during starting and landing of the airplanes. In particular, two types of blades are analyzed: stationary and rotating, which are widely applied in turbine engines produced by airplane factories.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
Blades, stationary (nozzles) and moving (turbine), are the most important critical elements of turbine engine structure. They are exposed to large temperature differences between exhaust and the air that cools them. In this case, the ones under the greatest loads are first degree stationary blades, as they are affected by gases flowing directly from the combustion chamber. The thermal stress occurring in the blade material is the greater, the greater the difference between exhaust gas and cooling air temperatures. Turbine blades that participate in transforming the kinetic energy of exhaust gases into rotational movement energy are additionally loaded with centrifugal force.
Tomasz Sadowski, Przemysław Golewski
Chapter 2. Protective Thermal Barrier Coatings
Abstract
The goal of using TBCs is, e.g. to reduce thermal conductivity between exhaust gases and the blade material, anti-corrosion protection and increased wear resistance.
Tomasz Sadowski, Przemysław Golewski
Chapter 3. Thermal Loads
Abstract
Thermal loads of combustion turbine blades can only be assessed by analysing their temperature fields. Knowledge of temperature fields enables determining the maximum temperature and temperature gradient values that decide thermal stresses and deformations.
Tomasz Sadowski, Przemysław Golewski
Chapter 4. Mechanical Loads
Abstract
Mechanical loads affecting turbine engine blades include: loads caused by static and dynamic interaction of the flowing medium with the profiled part of the blade, body loads caused by centrifugal forces, and loads caused by elastic vibrations of blades and the entire rotor.
Tomasz Sadowski, Przemysław Golewski
Chapter 5. Environmental Loads
Abstract
Turbine engines need to be supplied both with fuel and oxygen contained in the air. The most important parameter of aviation fuel is its chemical composition, which decides the fuel’s operating properties.
Tomasz Sadowski, Przemysław Golewski
Chapter 6. State of Arts in Experimental Testing of TBCs Systems—Literature Analysis
Abstract
Tests of TBC strength properties are complex and require utilising many modern methods.
Tomasz Sadowski, Przemysław Golewski
Chapter 7. Proposed Experimental Investigations of TBCs Systems
Abstract
One of the phenomena occurring in TBCs during their operation is the appearance of an Al2O3 layer, referred to as TGO in literature. Its occurrence is related to the presence of coating surface porosity, and consequently with the possibility of oxygen accessing the boundary between top coat (TC) and BC. One of the elements comprising the bond coat is aluminium. Therefore, oxygen that penetrates into a TBC system causes the formation of a thin (several micrometres) layer of aluminium oxide, whose thickness gradually increases in time.
Tomasz Sadowski, Przemysław Golewski
Chapter 8. Numerical Analysis of Cracks Propagation Process in Turbine Blades TBCs Systems Under Thermo-Mechanical Loading Based on Experimental Results
Abstract
In this chapter, we present a numerical method of thermo-mechanical analysis of the TBC systems. It can be used as a simulation of the whole TBCs systems behaviour or as a part of a large simulation as a submodel. Moreover, the method can be applied for calibrating material data that concerns damage evolution laws.
Tomasz Sadowski, Przemysław Golewski
Chapter 9. Summary
Abstract
In the book, the use of a new method of assessing damage developing in TBCs, subjected to thermal and mechanical loads, was presented. The method includes both numerical modelling and experimental tests.
Tomasz Sadowski, Przemysław Golewski
Metadata
Title
Loadings in Thermal Barrier Coatings of Jet Engine Turbine Blades
Authors
Tomasz Sadowski
Przemysław Golewski
Copyright Year
2016
Publisher
Springer Singapore
Electronic ISBN
978-981-10-0919-8
Print ISBN
978-981-10-0918-1
DOI
https://doi.org/10.1007/978-981-10-0919-8

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