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: X05.00009 : Experimental analyses of the transition to secondary thermoacoustic instabilities of H2-CH4-air premixed flames in slender tubes.*
9:44 AM–9:57 AM
Presenter:
Pedro Gatón-Pérez
(Universidad Politécnica de Madrid, ETSIAE)
Authors:
Pedro Gatón-Pérez
(Universidad Politécnica de Madrid, ETSIAE)
Daniel Martínez-Ruiz
(Universidad Politécnica de Madrid, ETSIAE)
Victor Muntean
(Universidad Politécnica de Madrid, ETSIAE)
An experimental set-up has been constructed, consisting in an open-closed round tube of D = 15.25 mm of extendable length L = 0 – 1.8m . The tube is filled with a selected mixture of air, methane and hydrogen which is ignited at the open end. Simultaneous measurements of pressure at various locations, along with high-speed videos of the flame, provide information on the interaction between the detected flame surface and pressure waves.
The transitional mechanism is observed to depend on the radial coordinate. To this end, theoretical analyses of a tube ideal acoustics with realistic non-homogeneous temperature distributions are performed. They predict axisymmetric acoustic velocity modes of much higher amplitude around the axis and, also, vorticity modes in the vicinity of the flame, which are compared against the effect of non-ideal pulsating flow profiles with preliminary PIV measurements to dilucidate the origin of the instability.
*This work was supported by the project GREENH2CM, funded by Comunidad de Madrid, Spanish Government through « Plan de Recuperación Transformación y Resiliencia » and European Union NextGenerationEU funds.
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