Abstract: We present an application of a newly introduced method to analyze the time-resolved experimental data from the flow field of a swirl-stabilized combustor. This method is based on the classic proper orthogonal decomposition ...

Abstract: Residence time distributions in a swirling, premixed combustor flow are determined by means of tracer experiments and a reactor network model. The measurements were conducted at nonreacting, reacting, and steamdiluted ...

Abstract: Amplitudedependent flame transfer functions, also denoted as flame describing functions, are valuable tools for the prediction of limitcycle amplitudes of thermoacoustic instabilities. However, the effects that govern the ...

Abstract: Linear stability analysis is applied to a swirlstabilized combustor flow with the aim to understand how the flame shape and associated density field affects the manifestation of selfexcited flow instabilities. In isothermal ...

Abstract: Lean premixed combustion promotes the occurrence of thermoacoustic phenomena in gas turbine combustors. One mechanism that contributes to the flame–acoustic interaction is entropy noise. Fluctuations of the equivalence ...

Abstract: This article is a report of experiments conducted in order to investigate the role of noise on thermoacoustic systems. In contrast to most studies in this direction, in the present work, the role of noise in the subthreshold ...

Abstract: Recently, a new interest in vertical axis wind turbine (VAWT) technology is fueled by research on floating support structures for large-scale offshore wind energy application. For the application on floating structures at ...

Abstract: Wind turbines are exposed to unsteady incident flow conditions such as gusts or tower interference. These cause a change in the blades' local angle of attack, which often leads to flow separation at the inner rotor sections. ...

Abstract: Equivalence ratio fluctuations are known to be one of the key factors controlling thermoacoustic stability in lean premixed gas turbine combustors. The mixing and thus the spatiotemporal evolution of these perturbations ...

Abstract: The current paper investigates the nonlinear interaction of the flow field and the unsteady heat release rate and the role of swirl fluctuations. The test rig consists of a generic swirlstabilized combustor fed with natural ...