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SUMMARY:Nonlinear thermoacoustics: flames on the edge of chaos - Prof. Mat
 thew Juniper (University of Cambridge)
DTSTART:20151009T120000Z
DTEND:20151009T130000Z
UID:TALK61401@talks.cam.ac.uk
CONTACT:Antoine Debugne
DESCRIPTION:Thermoacoustic oscillations occur in combustion chambers when 
 heat release oscillations lock into pressure oscillations. They were first
  observed in lamps in the 18th century\, in rockets in the 1930s\, and are
  now one of the most serious problems facing gas turbine manufacturers. \n
 \nMost analysis of thermoacoustic oscillations has been linear and has con
 sidered the point at which the oscillations become unstable. Nonlinear stu
 dies have usually assumed that\, once linearly unstable\, a thermoacoustic
  system grows to limit cycle oscillations. Recent experiments\, however\, 
 show that limit cycle oscillations in thermoacoustics are the exception ra
 ther than the rule. These experiments motivate the current study. \n\nIn t
 his study\, a pre-mixed flame in a tube is modelled using a level-set appr
 oach. The flame dynamics is coupled to the acoustics. This system\, althou
 gh relatively simple\, exhibits much of the elaborate nonlinear behaviour 
 found in experiments\, such as bi-periodic\, quasi-periodic\, multi-period
 ic and chaotic oscillations. This raises questions\, and some answers\, ab
 out how thermoacoustic oscillaions should be modelled in the nonlinear reg
 ime.\n
LOCATION:LR3B\, Inglis Building\, CUED.
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