• norsk
    • English
  • norsk 
    • norsk
    • English
  • Logg inn
Vis innførsel 
  •   Hjem
  • Øvrige samlinger
  • Publikasjoner fra CRIStin - NTNU
  • Vis innførsel
  •   Hjem
  • Øvrige samlinger
  • Publikasjoner fra CRIStin - NTNU
  • Vis innførsel
JavaScript is disabled for your browser. Some features of this site may not work without it.

Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor

Ahn, Byeonguk; Indlekofer, Thomas; Dawson, James; Worth, Nicholas
Peer reviewed, Journal article
Published version
Thumbnail
Åpne
Ahn (5.073Mb)
Permanent lenke
https://hdl.handle.net/11250/2988267
Utgivelsesdato
2022
Metadata
Vis full innførsel
Samlinger
  • Institutt for energi og prosessteknikk [4019]
  • Publikasjoner fra CRIStin - NTNU [35008]
Originalversjon
Journal of Engineering For Gas Turbines and Power. 2022, 144 (1), .   https://doi.org/10.1115/1.4052259
Sammendrag
The present article experimentally investigates the triggering and transient growth of azimuthal instabilities in a pressurized laboratory-scale annular combustor featuring 12 methane/hydrogen flames, as the equivalence ratio is ramped up and down. The ramping rate of equivalence ratio is varied to examine its effect on the transient thermo-acoustic response and the driving mechanisms, highlighting a number of previously unseen features. As the equivalence ratio is dynamically increased, all cases were observed to feature a distinct modal trajectory, during the onset of high-amplitude instabilities. Strongly spinning counterclockwise modes are first excited before a dynamic transition to strongly spinning clockwise modes occurs. Furthermore, the strength of the spinning mode (quantified through the spin ratio or nature angle) was shown to feature a local minima before the spinning mode stabilized in the system, which corresponds to an almost pure spinning state. Hysteresis behavior was observed in both the amplitude and nature of the mode, resulting in different thresholds for the onset and decay of the instability, depending on the time history of the combustor. Increasing the ramping rate was found to reduce the amount of hysteresis in the system. Furthermore, the high amplitude of the instability resulted in significant harmonic components. The behavior of the harmonics generally resembles the fundamental component, albeit with some notable exceptions.
Utgiver
American Society of Mechanical Engineers
Tidsskrift
Journal of Engineering For Gas Turbines and Power

Kontakt oss | Gi tilbakemelding

Personvernerklæring
DSpace software copyright © 2002-2019  DuraSpace

Levert av  Unit
 

 

Bla i

Hele arkivetDelarkiv og samlingerUtgivelsesdatoForfattereTitlerEmneordDokumenttyperTidsskrifterDenne samlingenUtgivelsesdatoForfattereTitlerEmneordDokumenttyperTidsskrifter

Min side

Logg inn

Statistikk

Besøksstatistikk

Kontakt oss | Gi tilbakemelding

Personvernerklæring
DSpace software copyright © 2002-2019  DuraSpace

Levert av  Unit