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LES-CMC of oxy-combustion of hydrogen jet

DOI: 10.1615/ICHMT.2015.THMT-15.990
pages 475-478

Artur Tyliszczak
Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science Al. Armii Krajowej 21, 42-201 Czestochowa, Poland

A. Rosiak
Faculty of Mechanical Engineering and Computer Sci., Czestochowa University of Tech., Al. Armii Krajowej 21, 42-200 Czestochowa,Poland

A. Boguslawski
Faculty of Mechanical Engineering and Computer Sci., Czestochowa University of Tech., Al. Armii Krajowej 21, 42-200 Czestochowa,Poland

Sinopsis

Large Eddy Simulation / Conditional Moment Closure (LES-CMC) simulations of non-premixed turbulent hydrogen jet in oxy-combustion regimes are performed. The fuel is pure hydrogen and the oxidiser is a mixture O2/H2O with mass fraction of water vapour in the range YH2O = 0.1 - 0.9. The fuel issues into a hot oxidiser stream (1030K-1045K), auto-ignites and the flame propagates through the domain. The problem analysed offers new challenges to combustion modelling as depending on O2 content in the oxidiser stream the combustion process may be strongly unsteady and on the border of stability and flammability limits. It is shown that LESCMC is well suited for such studies. We analyse the auto-ignition and forced ignition processes followed by flame propagation and stabilisation phases. The results obtained show that the content of YH2O directly affects the flame size and its lift-off height. It was observed that for low content of water vapour the auto-ignition time is a linear function of YH2O, whereas the axial locations of auto-ignition spots increase with YH2O content.

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