Prediction of thermoacoustic instabilities in combustors using linearized Navier-Stokes equations in frequency domain
2015 (English)In: 22nd International Congress on Sound and Vibration, ICSV 2015, International Institute of Acoustics and Vibrations , 2015Conference paper (Refereed)
The paper presents a numerical methodology for the prediction of the thermoacoustic instabilities with the effects of the mean-flow as well as the viscosity. As an academic standard test case, the configuration within the flame sheet located in the middle of the duct is investigated. First, the ducted flame numerical reference case is solved by the inhomogeneous Helmholtz equations in combination of the n - τ flame model assuming that the flow is at rest. Then, we derive the linearized Navier-Stokes equations (LNSE) in frequency domain in combination of the flame model. The unsteady effect of the flame is modeled by the n - τ flame model in harmonic form, which is essentially a 1D formulation relating the rate of heat release and the acoustic velocity at the reference point.
Place, publisher, year, edition, pages
International Institute of Acoustics and Vibrations , 2015.
Acoustic wave velocity, Frequency domain analysis, Linearization, Thermoacoustics, Viscous flow, Academic standards, Frequency domains, Inhomogeneous Helmholtz equations, Linearized navier-stokes equations, Numerical methodologies, Rate of heat release, Thermoacoustic instability, Unsteady effects, Navier Stokes equations
IdentifiersURN: urn:nbn:se:kth:diva-194715ScopusID: 2-s2.0-84971224854ISBN: 9788888942483OAI: oai:DiVA.org:kth-194715DiVA: diva2:1050022
22nd International Congress on Sound and Vibration, ICSV 2015, 12 July 2015 through 16 July 2015
Funding Details: FP7-PEOPLE-ITN-2012, EC, European Commission
QC 201611282016-11-282016-10-312016-11-28Bibliographically approved