Blar i NTNU Open på forfatter "Buschmann, Philip Erik"
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Intrinsic thermoacoustic modes in an annular combustion chamber
Buschmann, Philip Erik; Mensah, Georg; Moeck, Jonas (Peer reviewed; Journal article, 2020)Thermoacoustic instabilities originate from the interaction of unsteady heat release rate associated with flames and the acoustic modes of a combustor. A feedback loop not involving the natural acoustic modes has been ... -
The Nonlinear Thermoacoustic Eigenvalue Problem and Its Rational Approximations: Assessment of Solution Strategies
Merk, Moritz; Buschmann, Philip Erik; Moeck, Jonas; Polifke, Wolfgang (Peer reviewed; Journal article, 2022)Nonlinear eigenvalue problems (NLEVPs) arise in thermoacoustics by considering the temporal evolution of small perturbations in the relevant governing equations. In this work, two solution strategies are compared: (i) a ... -
On the role of symmetry and degeneracy in nonlinear thermoacoustic eigenproblems with application to can-annular combustors
Buschmann, Philip Erik (Doctoral theses at NTNU;2022:30, Doctoral thesis, 2022)The subject of this dissertation are thermoacoustic instabilities in combustion chambers with discrete rotational and reflective symmetries. Designing thermoacoustically stable combustors is one of the principal challenges ... -
Reduced-order modelling of thermoacoustic instabilities in can-annular combustors
Orchini, Alessandro; Pedergnana, Tiemo; Buschmann, Philip Erik; Moeck, Jonas; Noiray, Nicolas (Peer reviewed; Journal article, 2022)Thermoacoustic instabilities in stationary gas turbines may cause high-amplitude limit cycles, leading to damaged components and costly down-time. To better understand the physical origin of such instabilities in a can-annular ... -
Solution of Thermoacoustic Eigenvalue Problems with a Non-iterative Method
Buschmann, Philip Erik; Mensah, Georg; Nicoud, Franck; Moeck, Jonas (Peer reviewed; Journal article, 2020)Gas turbine combustors are prone to undesirable combustion dynamics in the form of thermoacoustic oscillations. Analysis of the stability of thermoacoustic systems in the frequency domain leads to nonlinear eigenvalue ... -
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 ... -
Ultrasonic well integrity logging using phased array technology
Johansen, Tonni Franke; Buschmann, Philip Erik; Røsberg, Knut Marius; Diez, Anja; Viggen, Erlend Magnus (Chapter, 2023)Ultrasonic well integrity logging is an important and common procedure for well completion and plug-and-abandonment operations. Typical logging tools employ single-element ultrasound transducers. In medical ultrasound ...