NDLI: Thermoacoustic Analysis of Combustion Instability Through a Distributed Flame Response Function

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Campa, Giovanni Camporeale, Sergio Mario Cosatto, Ezio Mori, Giulio
Copyright Year	2012
Abstract	Modern gas turbines equipped with lean premixed dry low emission combustion systems suffer the problem of thermoacoustic combustion instability. The acoustic characteristics of the combustion chamber and of the burners, as well as the response of the flame to the fluctuations of pressure and equivalence ratio, exert a fundamental influence on the conditions in which the instability may occur. A three dimensional finite element code has been developed in order to solve the Helmholtz equation with a source term that models the heat release fluctuations. The code is able to identify the frequencies at which thermoacoustic instabilities are expected and the growth rate of the pressure oscillations at the onset of instability. The code is able to treat complex geometries such as annular combustion chambers equipped with several burners. The adopted acoustic model is based upon the definition of the Flame Response Function (FRF) to acoustic pressure and velocity fluctuations in the burners. In this paper, data from CFD simulations are used to obtain a distribution of FRF of the κ-τ type as a function of the position within the chamber. The intensity coefficient, κ, is assumed to be proportional to the reaction rate of methane in a two-step mechanism. The time delay τ is estimated on the basis of the trajectories of the fuel particles from the injection point in the burner to the flame front. The paper shows the results obtained from the application of FRF with spatial distributions of both κ and τ. The present paper also shows the comparison between the application of the proposed model for the FRF and the traditional application of the FRF over a concentrated flame in a narrow area at the entrance to the combustion chamber. The distribution of the intensity coefficient and the time delay proves to have an influence, both on the eigenfrequency values and on the growth rates, in several of the examined modes. The proposed method is therefore able to establish a theoretical relation of the characteristics of the flame (depending on the burner geometry and operating conditions) to the onset of the thermoacoustic instability.
Sponsorship	International Gas Turbine Institute
Starting Page	179
Ending Page	188
Page Count	10
File Format	PDF
ISBN	9780791844687
DOI	10.1115/GT2012-68243
Volume Number	Volume 2: Combustion, Fuels and Emissions, Parts A and B
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Methane Computational fluid dynamics Oscillations Combustion Acoustics Fuels Pressure Emissions Sound pressure Geometry Flames Heat Gas turbines Simulation Particulate matter Fluctuations (physics) Delays Combustion systems Engineering simulation Finite element analysis Combustion chambers
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Influence of Flame and Burner Transfer Matrix on Thermoacoustic Combustion Instability Modes and Frequencies

Correspondence Between Uncoupled Flame Macrostructures and Thermoacoustic Instability in Premixed Swirl-Stabilized Combustion

Numerical Modeling of Thermoacoustic Oscillations in a Gas Turbine Combustion Chamber

Thermoacoustic Oscillations in an Annular Combustor

Prediction of Thermoacoustic Instability in Combustion Chamber Equipped With Passive Dampers

Thermoacoustic Flame Response of Swirl Flames

Investigation of Flame Dynamics in a V - Flame Combustor During Combustion Instability

Numerical Simulation of the Acoustic Pressure Field in an Annular Combustion Chamber With Helmholtz Resonators

Low-Order Modelling of Thermoacoustic Limit Cycles

Thermoacoustic Analysis of Combustion Instability Through a Distributed Flame Response Function

Similar Documents

Influence of Flame and Burner Transfer Matrix on Thermoacoustic Combustion Instability Modes and Frequencies

Correspondence Between Uncoupled Flame Macrostructures and Thermoacoustic Instability in Premixed Swirl-Stabilized Combustion

Numerical Modeling of Thermoacoustic Oscillations in a Gas Turbine Combustion Chamber

Thermoacoustic Oscillations in an Annular Combustor

Prediction of Thermoacoustic Instability in Combustion Chamber Equipped With Passive Dampers

Thermoacoustic Flame Response of Swirl Flames

Investigation of Flame Dynamics in a V - Flame Combustor During Combustion Instability

Numerical Simulation of the Acoustic Pressure Field in an Annular Combustion Chamber With Helmholtz Resonators

Low-Order Modelling of Thermoacoustic Limit Cycles

Thermoacoustic Analysis of Combustion Instability Through a Distributed Flame Response Function