Shear-Driven Hydrogen-Air Mixing in OP16 DLE Combustor: A Comparative Study Between URANS and LES

Teja Donepudi, Rene Pecnik, Jurriaan W. R. Peeters, Sikke Klein, Thijs Bouten, Lars-Uno Axelsson

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

This paper presents numerical predictions of the flow field in the swirl-stabilized OP16 DLE combustor using hydrogen as a fuel. Computational Fluid Dynamics (CFD) simulations employing unsteady Reynolds-Averaged Navier-Stokes (URANS) and Wall Modelled Large Eddy Simulations (WMLES) are performed without including reaction mechanisms. The objective is to gain insights into scalar mixing predictions of the two approaches when hydrogen and air undergo shear-driven turbulent mixing. Accurate scalar mixing predictions are crucial in the combustors’ design process to assess the uniformity of fuel-air mixing as localized regions of high fuel concentrations can lead to increased NOx emissions and to identify locations with a propensity for Boundary Layer Flashback (BLF). Results are compared and analyzed in terms of time-averaged equivalence ratio, unmixedness and Turbulent Kinetic Energy (TKE) profiles. TKE predictions are lower in URANS, leading to significantly lower fuel-air mixing levels than WMLES, indicating differences in their predictions of shear-layer interactions in the mixing region and the swirl section of the combustor.
Original languageEnglish
Title of host publicationCeramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels
Subtitle of host publicationASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition
PublisherThe American Society of Mechanical Engineers (ASME)
Number of pages10
Volume2
ISBN (Electronic)978-0-7918-8793-6
DOIs
Publication statusPublished - 2024
Event69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024 - London, United Kingdom
Duration: 24 Jun 202428 Jun 2024

Publication series

NameProceedings of the ASME Turbo Expo
Volume2

Conference

Conference69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024
Country/TerritoryUnited Kingdom
CityLondon
Period24/06/2428/06/24

Keywords

  • gas turbine combustion
  • hydrogen
  • shear flows
  • CFD

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