Blar i Institutt for energi og prosessteknikk på tidsskrift "Proceedings of the Combustion Institute"

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    • Large eddy simulation of CH4-air and C2H4-air combustion in a model annular gas turbine combustor 

      Zettervall, Niklas; Worth, Nicholas; Mazur, Marek; Dawson, James; Fureby, Christer (Journal article; Peer reviewed, 2018)
      Combustion instabilities are one of the major challenges in developing and operating propulsion and power generating gas-turbine engines. More specifically, techniques for managing the increasingly stringent emissions ...

    • Nonlinear interaction between clustered unstable thermoacoustic modes in can-annular combustors 

      von Saldern, Jakob; Moeck, Jonas; Orchini, Alessandro (Peer reviewed; Journal article, 2020)
      A can-annular combustor consists of a set of nominally identical cans, in which the flames burn in an essentially isolated manner. However, adjacent cans are able to communicate acoustically, which provides dynamic coupling ...

    • The Rayleigh integral is always positive in steadily operated combustors 

      Schuermans, Bruno; Moeck, Jonas; Blonde, Audrey; Dharmaputra, Bayu; Noiray, Nicolas (Peer reviewed; Journal article, 2022)
      The Rayleigh index has been used for decades by a large number of researchers as an indicator to determine if a flame is driving or damping thermoacoustic interaction mechanisms. The use of the Rayleigh criterion has found ...

    • Self-excited longitudinal and azimuthal modes in a pressurised annular combustor 

      Mazur, Marek; Kwah, Yi Hao; Indlekofer, Thomas; Dawson, James; Worth, Nicholas (Peer reviewed; Journal article, 2020)
      A new laboratory scale pressurised annular combustion experiment is introduced and used to generate selfexcited longitudinal and azimuthal instabilities. The experiments are operated at mean pressuresranging from approximately ...

    • Study of MILD combustion using LES and advanced analysis tools 

      Zhiyi, Li; Tomasch, Stefanie; Chen, Zhi X.; Parente, Alessandro; Ertesvåg, Ivar Ståle; Swaminathan, Nedunchezhian (Peer reviewed; Journal article, 2020)
      A cylindrical confined combustor operating under MILD condition is investigated using LES. The combustion and its interaction with turbulence are modeled using two reactor based models, PaSR and EDC. Results show that the ...

    • Suppression of self-excited thermoacoustic instabilities by convective-acoustic interference 

      Æsøy, Eirik; Jankee, Girish Kumarsing; Yadala, Srikar; Worth, Nicholas; Dawson, James (Peer reviewed; Journal article, 2022)
      In this paper we demonstrate direct suppression of self-excited thermoacoustic instabilities over a range of operating conditions using targeted convective-acoustic interference. Premixed hydrogen enriched methane-air ...

    • Symmetry breaking modelling for azimuthal combustion dynamics 

      Ghirardo, Giulio; Nygård, Håkon Tormodsen; Cuquel, Alexis; Worth, Nicholas (Peer reviewed; Journal article, 2020)
      Annular combustors can exhibit azimuthal thermoacoustic instabilities, which can rotate as a spinning wave at the speed of sound in the azimuthal direction, oscillate as a standing wave with pressure nodes fixed in space, ...

    • Thermoacoustic oscillations in a can-annular model combustor with asymmetries in the can-to-can coupling 

      Buschmann, Philip Erik; Worth, Nicholas; Moeck, Jonas (Peer reviewed; Journal article, 2022)
      Can-annular combustors are equipped with a set of nominally identical cans, circumferentially arranged around the shaft. Adjacent cans are coupled acoustically via a small gap at the downstream end, where the circular ...