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Active flow control of hydrodynamic instabilities in gas turbine combustors
Contact: Finn Lückoff
We are investigating the direct impact of the precessing vortex core (PVC) on dynamics, thermoacoustic instabilities and emissions of swirl-stabilized flames by means of active flow control within the scope of this DFG-funded project. The PVC is a dominant coherent flow structure, which appears typically in swirling flows. This type of flow is especially utilized in gas turbine combustion chambers to stabilize the flame aerodynamically.
- Figure 1: Phase-averaged sequence of the interaction of PVC-induced vortices with a swirl flame (OHp). The PVC is controlled with the actuator shown in Fig. 2
- © ISTA
We are interested in investigating the effects of the PVC on flame- and flow properties in greater detail to use them beneficially. For this purpose, an experimental set up is realized, which allows for controlling the PVC directly at its points of origin. The corresponding actuator (figure 2) is capable to actuate the PVC azimuthally in open and closed loop control mode. In this way, the PVC can be forced and damped precisely.
- © ISTA
To characterize the PVC and its impact of flow and flame, sensor-based pressure measurements as well as modern optical and laser-based measurement techniques such as OH*-chemiluminescence, particle image velocimetry (PIV), quantitative light sheet (QLS) methods and planar laser induced fluorescence (PLIF) are used.
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