Session: 04-23: Combustion Dynamics - Numerical Methods I

Paper Number: 82397

82397 - LES of Turbulent Premixed CH4/H2/Air Flames With Stretch and Heat Loss for Flame Characteristics and Dynamics 

This paper presents a LES turbulent combustion model for premixed methane/hydrogen/air mixtures which accounts for stretch, heat loss and Lewis number effects by means of a previously proposed turbulent flame speed expression [1]. In this expression stretch and heat loss effects are introduced by means of strained non-adiabatic laminar consumption speed calculations in fresh-to-burnt counter flow configurations with detailed chemistry and preferential diffusion of hydrogen is accounted for by calculating an effective Lewis number of the reactants. 

To validate the model, large eddy simulations of fully premixed atmospheric bluff body stabilized methane/hydrogen/air flames are compared against OH* chemiluminescence measurements [2] for mixtures varying from pure methane to pure hydrogen. Flame stabilizations and heat release distributions over the flame are compared based on mean flame shapes and axial distributions in qualitative and quantitative manner respectively. Flame dynamics is investigated through extraction of flame transfer functions (FTFs) with system identification (SI) methods and compared with FTFs from experiments. Good agreement between simulations and experiments in terms of flame characteristics and dynamics is achieved. 

 

[1] Kutkan, H., Amato, A., Campa, G., Ghirardo, G., Tay Wo Chong, L., and Æsøy, E. (October 20, 2021). "Modeling of Turbulent Premixed CH₄/H₂/Air Flames Including the Influence of Stretch and Heat Losses." ASME. J. Eng. Gas Turbines Power. January 2022; 144(1): 011020. https://doi.org/10.1115/1.4051989. 

 

[2] Æsøy, E., Aguilar, J., Wiseman, S., Bothien, M., Worth, N. and Dawson, J. (February 20, 2020). “Scaling and prediction of transfer functions in lean premixed H2/CH4-flames” Combust. Flame. May 2020; 215: 0010-2180. https://doi.org/10.1016/j.combustflame.2020.01.045. 

Presenting Author: Halit Kutkan University of Genoa

Presenting Author Biography: He is a PhD student at University of Genoa, and a combustion researcher at Ansaldo Energia S.p.A. along the Marie Curie project POLKA EU.

Authors:

Halit Kutkan University of Genoa
Alberto Amato Ansaldo Energia S.p.A.
Giovanni Campa Ansaldo Energia S.p.A.
Luis Tay Wo Chong Ansaldo Energia Switzerland AG
Eirik Æsøy Norwegian University of Science and Technology