On the Mechanism Responsible for Extreme Turbulence Intensity Generation in the Hi-Pilot Burner

Isaac G. Boxx*, Aaron W. Skiba, Campbell D. Carter, Alberto Ceschin, Francisco E.Hernández Pérez, Hong G. Im

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


In 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.

Original languageEnglish (US)
Pages (from-to)411-433
Number of pages23
JournalFlow, Turbulence and Combustion
Issue number2
StatePublished - Aug 2022

Bibliographical note

Funding Information:
This project has received 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).

Publisher Copyright:
© 2022, The Author(s).


  • Extreme turbulence intensity
  • Flamelet
  • Hi-Pilot burner
  • Jet oscillation
  • Premixed flames

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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