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Direct impact of the Precessing Vortex Core in swirl-stabilized flames

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: Visualization of a swirling jet with inner recirculation zone (grey), surrounded by the PVC (blue) and helical waves in the outer shear layer.
Lupe

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 [1]. 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. 

Lupe

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 [2], particle image velocimetry (PIV), quantitative light sheet (QLS) methods and planar laser induced fluorescence (PLIF) are used.

 

Publications

Lückoff, F., Sieber, M., Paschereit, C. O., & Oberleithner, K. (2018). Characterization of Different Actuator Designs for the Control of the Precessing Vortex Core in a Swirl-Stabilized Combustor. Journal of Engineering for Gas Turbines and Power140(4), 041503.

Lückoff, F., Sieber, M., & Oberleithner, K. (2018, June). Open-Loop Control of the Precessing Vortex Core in a Swirl-Stabilized Combustor: Impact on Flame Shape and Flame Stability. In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition (pp. V04AT04A029-V04AT04A029). American Society of Mechanical Engineers.

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