On the Mechanism Responsible for Extreme Turbulence Intensity Generation in the Hi-Pilot Burner
AuthorsBoxx, Isaac G.
Skiba, Aaron W.
Carter, Campbell D.
Pérez, Francisco E. Hernández
Im, Hong G.
KAUST DepartmentMechanical Engineering
Physical Science and Engineering (PSE) Division
Mechanical Engineering Program
Clean Combustion Research Center
Permanent link to this recordhttp://hdl.handle.net/10754/676451
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AbstractIn this study, we apply particle image velocimetry (PIV), hot-wire anemometry (HWA), and large-eddy simulation (LES) to identify and characterize a key mechanism by which high-intensity turbulence measured in the “Hi-Pilot” burner is generated. Large-scale oscillation of the high-velocity jet core about its own mean axial centerline is identified as a dominant feature of the turbulent flow field produced by this piloted Bunsen burner. This oscillation is linked to unsteady flow separation along the expanding section of the reactant nozzle and appears stochastic in nature. It occurs over a range of frequencies (100–300 Hz) well below where the turbulent kinetic energy (TKE) spectrum begins to follow a – 5/3 power law and results in a flow with significant scale separation in the TKE spectrum. Although scale separation and intermittency are not unusual in turbulent flows, this insight should inform analysis and interpretation of previous, and future studies of this unique test case
CitationBoxx, I. G., Skiba, A. W., Carter, C. D., Ceschin, A., Pérez, F. E. H., & Im, H. G. (2022). On the Mechanism Responsible for Extreme Turbulence Intensity Generation in the Hi-Pilot Burner. Flow, Turbulence and Combustion. https://doi.org/10.1007/s10494-022-00328-8
SponsorsReceived funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No.682383). AC, FEHP and HGI acknowledge the support of King Abdullah University of Science and Technology (KAUST) and computational resources provided by the KAUST Supercomputing Laboratory (KSL)
Open Access funding enabled and organized by Projekt DEAL
PublisherSpringer Science and Business Media LLC
JournalFlow, Turbulence and Combustion
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