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Towards best practice for predicting a lifted hydrogen diffusion flame using a flamelet generated manifold approach [GT2023-102250]

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conference contribution
posted on 2023-09-04, 16:03 authored by Ashley van BruygomAshley van Bruygom, Andrew GarmoryAndrew Garmory, Duncan WalkerDuncan Walker

This paper examines a lifted turbulent H2/N2 diffusion flame in a vitiated co-flow, using a Flamelet Generated Manifold (FGM) combustion model. FGM is commonly used in combusting simulations in the gas turbine industry as it is cheaper than solving detailed chemistry as part of the simulation. The aim of this paper is to examine the ability of the FGM model to reproduce experimental results, and its sensitivity to modelling choices, using an implementation within the commercial code, Simcenter STAR-CCM+. Hence, the current study systematically examines the impact of turbulence modelling, inlet conditions, the flamelet model used to generate the FGM table and the chemical mechanisms. Both Reynold Averaged Navier Stokes (RANS) and Large Eddy Simulations (LES) are presented with focus on the effect of inlet conditions, three different flamelet generation methods and two chemical mechanisms. The flame lift-off height is shown to be highly sensitive to chemical mechanism and flamelet table generation method, with the 0D flamelet giving a higher lift-off than the 1D flamelets. The inlet velocity profile was found to have less of an impact on LES results. This work shows that care should be taken when attempting to identify an accurate simulation methodology and that modelling choices are not considered in isolation as the apparent superiority of a modelling choice may be an artefact of other modelling choices.

Funding

EPSRC Centre for Doctoral Training in Future Propulsion and Power

Engineering and Physical Sciences Research Council

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EPSRC Centre for Doctoral Training in Gas Turbine Aerodynamics

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition

Volume

3A: Combustion, Fuels, and Emissions

Source

ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition (GT2023)

Publisher

American Society of Mechanical Engineers (ASME)

Version

  • AM (Accepted Manuscript)

Rights holder

© ASME

Publisher statement

© ASME All Rights Reserved. This paper was accepted for publication in the Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition and the definitive published version is available in the ASME Digital Library at https://doi.org/10.1115/GT2023-102250

Acceptance date

2023-04-30

Publication date

2023-09-28

Copyright date

2023

ISBN

9780791886953

Other identifier

V03AT04A055

Language

  • en

Location

Boston, Massachusetts, USA

Event dates

26th June 2023 - 30th June 2023

Depositor

Dr Duncan Walker. Deposit date: 31 August 2023

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