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Main Title: Design of a Fluidic Actuator with Independent Frequency and Amplitude Modulation for Control of Swirl Flame Dynamics
Author(s): Adhikari, Amrit
Schweitzer, Thorge
Lückoff, Finn
Oberleithner, Kilian
Type: Article
Language Code: en
Abstract: 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 available flow control systems are designed to control the PVC in laboratory-scale setups. To further develop these systems and find an approach applicable to the industrial scale, a new actuator design based on fluidic oscillators is presented and studied in this paper. This actuator allows for independently adjusting forcing frequency and amplitude, which is necessary to effectively target the dynamics of the PVC. The functionality and flow control of this actuator design are studied based on numerical simulations and experimental measurements. To verify the flow control authority, the actuator is built into a prototype combustor test rig, which allows for investigating the impact of the actuator’s forcing on the PVC at isothermal conditions. The studies conducted in this work prove the desired functionality and flow control authority of the 3D-printed actuator. Accordingly, a two-part stainless steel design is derived for future test conditions with flame.
Issue Date: 20-Mar-2021
Date Available: 12-Apr-2021
DDC Class: 530 Physik
Subject(s): active flow control
fluidic oscillator
precessing vortex core
swirl flame dynamics
Sponsor/Funder: DFG, 247226395, Untersuchung des direkten Einflusses des Precessing Vortex Core auf die Dynamik, thermoakustische Instabilitäten und Emissionen drallstabilisierter Flammen mittels aktiver Strömungskontrolle
Journal Title: Fluids
Publisher: MDPI
Publisher Place: Basel
Volume: 6
Issue: 3
Article Number: 128
Publisher DOI: 10.3390/fluids6030128
EISSN: 2311-5521
Appears in Collections:FG Dynamik instabiler Strömungen » Publications

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