Journal
COMBUSTION THEORY AND MODELLING
Volume 16, Issue 2, Pages 275-299Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13647830.2011.620174
Keywords
flame dynamics in wall-bounded flows; intermittency; period doubling cascade; mixed mode oscillations; spectral element method
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Funding
- Swiss National Foundation [200021-109398]
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The complex oscillatory behaviour observed in fuel-lean premixed hydrogen/air atmospheric pressure flames in an open planar channel with prescribed wall temperature is investigated by means of direct numerical simulations, employing detailed chemistry descriptions and species transport, and nonlinear dynamics analysis. As the inflow velocity is varied, the sequence of transitions includes harmonic single frequency oscillations, intermittency, mixed mode oscillations, and finally a period-doubling cascade leading to chaotic dynamics. The observed modes are described and characterised by means of phase-space portraits and next amplitude maps. It is shown that the interplay of chemistry, transport, and wall-bounded developing flow leads to considerably richer dynamics compared to fuel-lean hydrogen/air continuously stirred tank reactor studies.
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