Modeling of h2/air flame stabilization regime above coaxial dual swirl injectors

S. Marragou, H. Magnes, A. Aniello, Thibault Guiberti, L. Selle, T. Poinsot, T. Schuller

Research output: Contribution to journalArticlepeer-review

Abstract

The prediction of the stabilization regime of partially premixed H2/air flames above an injector is a main subject of interest for the development of gas turbines powered by hydrogen. The way the flame is stabilized has an impact on NOx emissions, thermal stress on the injector, and combustion stability. A model based on the triple flame speed is revisited and improved to predict flame stabilization using information gathered at cold flow conditions. The model is called TFUP for Triple Flame Upstream Propagation. According to this model, the flame can anchor to the injector only if a zone with a flammable mixture and a sufficiently low local flow velocity exists continuously from the lifted flame to the injector lips. The TFUP model is applied to the case of a H2/air coaxial, dual swirl injector in which both the hydrogen and air streams are swirled. Fuel is injected through the central channel and oxidizer through the external channel. Particle image velocimetry and one dimensional Raman scattering measurements made at strategic locations are used to predict the edge flame speed for which a lifted flame should re-anchor to the injector. These predictions made in isothermal conditions are compared to observations of the flame stabilization regime. The central flow of hydrogen can be mixed with methane and helium and the external flow of air with nitrogen in order to prescribe different theoretical values for the triple flame speed. Predictions agree well with the observations made for all swirl levels conferred to the central fuel stream, fuel injection velocities, hydrogen contents in the fuel mixture injected in the central channel, and nitrogen contents in the oxidizer annular channel tested in the study. Validity limits are also discussed. The methodology presented in this study provides a simple framework to predict flame stabilization on coaxial injectors that can optionally be equipped with swirl vanes.
Original languageEnglish (US)
Pages (from-to)112908
JournalCombustion and Flame
Volume255
DOIs
StatePublished - Jul 18 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-07-21
Acknowledgements: This project has received funding from the European Research Council under the European Union’s Horizon 2020 research and innovation program Grant Agreement 832248, SCIROCCO and under the Horizon 2020, COEC (Center of Excellence in Combustion) program, Grant Agreement 952181. The authors are grateful to the technical support from G. Albert, S. Cazin, S. Lun Kwong Leon, M. Marchal, L. Mouneix and R. Soeparno from IMFT.

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • General Physics and Astronomy
  • General Chemical Engineering
  • General Chemistry
  • Fuel Technology

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