The analysis of mechanical integrity in gas turbine engines subjected to combustion instabilities

Abdullah Can Altunlu

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

66 Downloads (Pure)

Abstract

Stringent regulations have been introduced towards reducing pollutant emissions and preserving our environment. Lowering NOx emissions is one of the main targets of industrial gas turbine engines for power generation. The combustion zone temperature is one of the critical parameters, which is directly proportional to NOx emission levels. Premixing an excessive amount of air with fuel before delivering to the combustor can reduce the temperature, at which combustion takes place, by burning a leaner mixture. Therefore, new generation combustion systems for modern gas turbines have been introduced, which are named lean, premixed (LP) combustion systems. However, LP combustion systems are prone to thermo-acoustically induced combustion instabilities, which are excited by a feedback mechanism between heat release, pressure and flow-mixture oscillations. Consequently, high amplitude oscillations of pressure are generated and heat transfer is generated, which results in mechanical vibrations at elevated temperatures, and hence degradation of mechanical integrity of combustor components due to fatigue and creep damage. The present work in this thesis is focused on the development of efficient analysis tools to investigate the sensitivity of mechanical integrity and to assess the lifetime of structures at combustion instabilities.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • de Boer, Andries , Supervisor
  • Tinga, Tiedo , Supervisor
  • van der Hoogt, P.J.M., Advisor
Award date12 Jul 2013
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-0055-5
DOIs
Publication statusPublished - 12 Jul 2013

Fingerprint

Gas turbines
Turbines
Combustors
Temperature
Power generation
Creep
Fatigue of materials
Heat transfer
Feedback
Degradation
Air

Keywords

  • IR-86913
  • METIS-297188

Cite this

Altunlu, Abdullah Can. / The analysis of mechanical integrity in gas turbine engines subjected to combustion instabilities. Enschede : University of Twente, 2013. 182 p.
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The analysis of mechanical integrity in gas turbine engines subjected to combustion instabilities. / Altunlu, Abdullah Can.

Enschede : University of Twente, 2013. 182 p.

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

TY - THES

T1 - The analysis of mechanical integrity in gas turbine engines subjected to combustion instabilities

AU - Altunlu, Abdullah Can

PY - 2013/7/12

Y1 - 2013/7/12

N2 - Stringent regulations have been introduced towards reducing pollutant emissions and preserving our environment. Lowering NOx emissions is one of the main targets of industrial gas turbine engines for power generation. The combustion zone temperature is one of the critical parameters, which is directly proportional to NOx emission levels. Premixing an excessive amount of air with fuel before delivering to the combustor can reduce the temperature, at which combustion takes place, by burning a leaner mixture. Therefore, new generation combustion systems for modern gas turbines have been introduced, which are named lean, premixed (LP) combustion systems. However, LP combustion systems are prone to thermo-acoustically induced combustion instabilities, which are excited by a feedback mechanism between heat release, pressure and flow-mixture oscillations. Consequently, high amplitude oscillations of pressure are generated and heat transfer is generated, which results in mechanical vibrations at elevated temperatures, and hence degradation of mechanical integrity of combustor components due to fatigue and creep damage. The present work in this thesis is focused on the development of efficient analysis tools to investigate the sensitivity of mechanical integrity and to assess the lifetime of structures at combustion instabilities.

AB - Stringent regulations have been introduced towards reducing pollutant emissions and preserving our environment. Lowering NOx emissions is one of the main targets of industrial gas turbine engines for power generation. The combustion zone temperature is one of the critical parameters, which is directly proportional to NOx emission levels. Premixing an excessive amount of air with fuel before delivering to the combustor can reduce the temperature, at which combustion takes place, by burning a leaner mixture. Therefore, new generation combustion systems for modern gas turbines have been introduced, which are named lean, premixed (LP) combustion systems. However, LP combustion systems are prone to thermo-acoustically induced combustion instabilities, which are excited by a feedback mechanism between heat release, pressure and flow-mixture oscillations. Consequently, high amplitude oscillations of pressure are generated and heat transfer is generated, which results in mechanical vibrations at elevated temperatures, and hence degradation of mechanical integrity of combustor components due to fatigue and creep damage. The present work in this thesis is focused on the development of efficient analysis tools to investigate the sensitivity of mechanical integrity and to assess the lifetime of structures at combustion instabilities.

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KW - METIS-297188

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SN - 978-90-365-0055-5

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