Critical transitions and their early warning signals in thermoacoustic systems
Many complex systems undergo critical transitions. A thermoacoustic system is one such
system which exhibits a catastrophic transition to a state of oscillatory instability known as …
system which exhibits a catastrophic transition to a state of oscillatory instability known as …
Nonlinear interaction between a precessing vortex core and acoustic oscillations in a turbulent swirling flame
The interaction of a helical mode with acoustic oscillations is studied experimentally in a
turbulent swirl-stabilized premixed flame. In addition to a precessing vortex core (PVC), the …
turbulent swirl-stabilized premixed flame. In addition to a precessing vortex core (PVC), the …
Thermoacoustic instability as mutual synchronization between the acoustic field of the confinement and turbulent reactive flow
Thermoacoustic instability is the result of a positive coupling between the acoustic field in
the duct and the heat release rate fluctuations from the flame. Recently, in several turbulent …
the duct and the heat release rate fluctuations from the flame. Recently, in several turbulent …
Shear flow instabilities in swirl-stabilized combustors and their impact on the amplitude dependent flame response: A linear stability analysis
K Oberleithner, S Schimek, CO Paschereit - Combustion and Flame, 2015 - Elsevier
The hydrodynamic instabilities in the flow field of a swirl-stabilized combustor are
investigated theoretically. These instabilities give rise to large-scale flow structures that …
investigated theoretically. These instabilities give rise to large-scale flow structures that …
[HTML][HTML] Coupled interaction between unsteady flame dynamics and acoustic field in a turbulent combustor
Thermoacoustic instability is a result of the positive feedback between the acoustic pressure
and the unsteady heat release rate fluctuations in a combustor. We apply the framework of …
and the unsteady heat release rate fluctuations in a combustor. We apply the framework of …
High-frequency thermoacoustic modulation mechanisms in swirl-stabilized gas turbine combustors—Part I: Experimental investigation of local flame response
FM Berger, T Hummel… - … for Gas Turbines …, 2017 - asmedigitalcollection.asme.org
This paper presents the experimental approach for determination and validation of
noncompact flame transfer functions of high-frequency, transverse combustion instabilities …
noncompact flame transfer functions of high-frequency, transverse combustion instabilities …
Chemiluminescence as diagnostic tool in the development of gas turbines
To optimise the operation of gas turbine combustors with respect to emission, cycle
efficiency and components lifetime, increased attention has to be attributed to diagnostic …
efficiency and components lifetime, increased attention has to be attributed to diagnostic …
Coupled interactions of a helical precessing vortex core and the central recirculation bubble in a swirl flame at elevated power density
The PRECCINSTA GTMC was studied at elevated pressure and power density with 6 kHz
stereoscopic particle image velocimetry (SPIV), OH* chemiluminescence (CL), and 100 kHz …
stereoscopic particle image velocimetry (SPIV), OH* chemiluminescence (CL), and 100 kHz …
Tomographic reconstruction of heat release rate perturbations induced by helical modes in turbulent swirl flames
Swirl flows with vortex breakdown are widely used in industrial combustion systems for
flame stabilization. This type of flow is known to sustain a hydrodynamic instability with a …
flame stabilization. This type of flow is known to sustain a hydrodynamic instability with a …
An experimental investigation of the nonlinear response of an atmospheric swirl-stabilized premixed flame
S Schimek, JP Moeck, CO Paschereit - 2011 - asmedigitalcollection.asme.org
Due to stringent emission restrictions, modern gas turbines mostly rely on lean premixed
combustion. Since this combustion mode is susceptible to thermoacoustic instabilities, there …
combustion. Since this combustion mode is susceptible to thermoacoustic instabilities, there …