Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X05: Thermoacoustics
8:00 AM–10:23 AM,
Tuesday, November 21, 2023
Room: 102A
Chair: Sarma Rani, University of Alabama in Huntsville
Abstract: X05.00007 : Acoustic Emission of Thermodiffusive Unstable Premixed Lean Hydrogen-Air Slit Flames*
9:18 AM–9:31 AM
Presenter:
Borja P Pedro Beltran
(RWTH Aachen University, Institute of Aerodynamics)
Authors:
Borja P Pedro Beltran
(RWTH Aachen University, Institute of Aerodynamics)
Matthias Meinke
(RWTH Aachen University, Institute of Aerodynamics and Chair of Fluid Mechanics)
Wolfgang Schröder
(RWTH Aachen University, Institute of Aerodynamics and Chair of Fluid Mechanics)
In this work, two-dimensional lean premixed hydrogen-air slit flames are investigated. The fuel-air-equivalence ratio is varied and the effects on general flame dynamics are investigated. For the various cases, intrinsic instabilities of the non-excited flame lead to strong cellular structures along the flame front, which cause constant pocket shedding and strong pressure fluctuations at the flame tip. Due to Markstein-length related effects, intrinsic differences have been found when compared to more widely investigated methane-air premixed flames. A more detailed investigation of the thermoacoustics by solving the acoustic perturbation equations which contain the input data from the flow field for the source terms enhances the specific understanding of the different acoustic source contributions and the overall acoustic field of hydrogen-air flames compared to methane-air flames.
*This project is funded by the German Research Association under the project # SCHR 309/80.
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