Dynamics of Swirl and Jet Flames (SWJET)

• Applicants: Professor Dr.-Ing. Kilian Oberleithner; Professor Wolfgang Polifke, Ph.D.
• Subject Area: Hydraulic and Turbo Engines and Piston Engines ; Acoustics ; Fluid Mechanics ; Technical Thermodynamics
• Term: from 2020 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 441269395

• Final Report Year: 2024

Final Report Abstract

Thermoacoustic instabilities pose significant challenges to developing flexible, reliable, and safe gas turbines, particularly in terms of power range and fuel composition, including hydrogen. Addressing these challenges is essential for creating low-emission gas turbines contributing to carbon-free power generation systems. The SWJET project aims to advance the monolithic understanding of thermoacoustic instabilities in jet and swirl flames. This project is divided into two main components: a numerical approach based on the theory of linearized fields and experimental validation data, in the continuation of a predecessor project. Experimental and simulation results highlight the impact of pilot flames on perfectly and technically premixed flame shapes and their corresponding flame transfer functions. The current numerical project also documents the first application of linearized analysis to turbulent flames, emphasizing the linearization of heat release rate models and the challenges involved. Additionally, special attention is given to the generation and transport of inertial waves and their role in amplification mechanisms.

Publications

• Linearized Reactive Flows: An Application to Swirl Flames. In: 18th International Conference on Numerical Combustion. 2022
  Gregoire Varillon et al.
  
• Linearizing a Reacting Turbulent Jet Flow: How to Do It, and How Not To. In: 75th APS/DFD Annual Meeting. 2022
  Thomas Ludwig Kaiser et al.
  
• Linearizing a Turbulent Bunsen Flame. In: 18th International Conference on Numerical Combustion. 2022
  Thomas Ludwig Kaiser et al.
  
• Mean flow data assimilation based on physics-informed neural networks. Physics of Fluids, 34(11).
  von Saldern, Jakob G. R.; Reumschüssel, Johann Moritz; Kaiser, Thomas L.; Sieber, Moritz & Oberleithner, Kilian
  
• Resolvent-based modelling of coherent structures in a turbulent jet flame using a passive flame approach. Combustion and Flame, 236, 111695.
  Casel, Mario; Oberleithner, Kilian; Zhang, Feichi; Zirwes, Thorsten; Bockhorn, Henning; Trimis, Dimosthenis & Kaiser, Thomas L.
  
• A Comprehensive Linearised Flow Model for Swirling Jets. In: Symposium on Thermoacoustics in Combustion: Industry Meets Academia (SoTiC 2023). 2023
  Gregoire Varillon et al.
  
• FELiCS: A Versatile Linearized Solver Addressing Dynamics in Multi-Physics Flows. AIAA AVIATION 2023 Forum. American Institute of Aeronautics and Astronautics.
  Kaiser, Thomas L.; Demange, Simon; Müller, Jens S.; Knechtel, Sophie & Oberleithner, Kilian
  
• Global Linear Stability Analysis of a Slit Flame Subject to Intrinsic Thermoacoustic Instability. In: Proceedings of the 29th International Congress on Sound and Vibration. 2023
  Gregoire Varillon, Philipp Brokof & Wolfgang Polifke
  
• Modelling the response of a turbulent jet flame to acoustic forcing in a linearized framework using an active flame approach. Combustion and Flame, 253, 112778.
  Kaiser, Thomas L.; Varillon, Gregoire; Polifke, Wolfgang; Zhang, Feichi; Zirwes, Thorsten; Bockhorn, Henning & Oberleithner, Kilian
  
• On the Significance of Modeling Turbulent Transport When Linearizing the Governing Equations of a Turbulent Bunsen Flame. In: Symposium on Thermoacoustics in Combustion: Industry Meets Academia (SoTiC 2023). 2023
  Thomas Ludwig Kaiser et al.
  
• Self-consistent closure modeling for linearized mean field methods. AIAA AVIATION 2023 Forum. American Institute of Aeronautics and Astronautics.
  von Saldern, Jakob G.; Reumschüssel, Johann M.; Kaiser, Thomas L.; Schmidt, Oliver T.; Jordan, Peter & Oberleithner, Kilian
  
• Using a Linear Mean Flow Analysis with an Active Flame Approach to Model the Response of a Turbulent Jet Flame to Acoustic Excitation. In: Progress in Flow Instability, Transition and Control
  Thomas Ludwig Kaiser et al.
  
• Arbitrary-order sensitivities of the incompressible base flow and its eigenproblem. Journal of Fluid Mechanics, 985.
  Knechtel, S.J.; Kaiser, T.L.; Orchini, A. & Oberleithner, K.
  
• Interacting Linear Modes in the Turbulent Flow of an Industrial Swirled Combustor. AIAA Journal, 62(3), 979-988.
  Moczarski, Lukas; Treleaven, Nicholas C. W.; Oberleithner, Kilian; Schmidt, Simon; Fischer, André & Ludwig, Kaiser Thomas
  
• Linear analysis of a swirling jet with a realistic swirler model. International Journal of Spray and Combustion Dynamics, 16(3), 186-199.
  Varillon, Grégoire; Kaiser, Thomas Ludwig; Brokof, Philipp; Oberleithner, Kilian & Polifke, Wolfgang