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Direct numerical simulation of three‐dimensional flame instabilities
Author(s) -
Gerlinger W.,
Schneider K.,
Bockhorn H.
Publication year - 2001
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/zamm.20010811544
Subject(s) - extinction (optical mineralogy) , combustion , mechanics , premixed flame , diffusion flame , flammability limit , transient (computer programming) , computer simulation , radius , materials science , steady state (chemistry) , physics , combustor , chemistry , optics , computer science , computer security , operating system
The evolution of premixed gas flames near extinction and stability limits is of primary interest for many applications in combustion technology. Under such conditions the flames are very sensitive, and exhibit quasi‐steady state behaviour so that they are well‐suited to determine flammability limits. We show three‐dimensional numerical simulation of the transient behaviour of lean H 2 ‐air flames. The thermo‐diffusive equations are solved by means of a parallelized Fourier‐pseudospectral code. We compute the evolution of freely propagating spherical flames, whereby the influence of the initial flame radius is investigated. The results exhibit different behaviour as found in experimental studies under microgravity conditions, i.e. the splitting due to cellular instabilities, extinction, and stationary flame balls.