FG Dynamik instabiler Strömungen3 Items
Lückoff, Finn Simon (2021)
The flow inside a gas turbine is typically highly turbulent when it leaves the compressor and reaches the burner inlet. Inside the burner, the flow typically passes through a swirl generator which transforms the almost parallel flow into a swirling flow. The degree of the swirl induced to the flow is su ciently high such that the swirling jet emanating from the burner outlet into the combustion...Design of a Fluidic Actuator with Independent Frequency and Amplitude Modulation for Control of Swirl Flame Dynamics
Adhikari, Amrit ; Schweitzer, Thorge ; Lückoff, Finn ; Oberleithner, Kilian (2021-03-20)
Fluidic actuators are designed to control the oscillatory helical mode, called a precessing vortex core (PVC), which is often observed in gas turbine combustors. The PVC induces large-scale hydrodynamic coherent structures, which can considerably affect flow and flame dynamics. Therefore, appropriate control of this structure can lead to a more stable and efficient combustion process. Currently...Excitation of the precessing vortex core by active flow control to suppress thermoacoustic instabilities in swirl flames
Lückoff, Finn ; Oberleithner, Kilian (2019-07-04)
In this study, we apply periodic flow excitation of the precessing vortex core at the centerbody of a swirl-stabilized combustor to investigate the impact of the precessing vortex core on flame shape, flame dynamics, and especially thermoacoustic instabilities. The current control scheme is based on results from linear stability theory that determine the precessing vortex core as a global hydro...