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SUMMARY:Acoustic-vortical-entropic generations and their influences on the
 rmoacoustic instability in a nonuniform-radius combustor with moving flame
  front - Dr Yong Chen (Academic Visitor DAMTP)
DTSTART:20180524T100000Z
DTEND:20180524T110000Z
UID:TALK106090@talks.cam.ac.uk
CONTACT:Matthew Priddin
DESCRIPTION:It is widely known that unsteady combustion flame front genera
 tes acoustic\, vortical and\nentropic disturbances. Previous research show
 s that an interaction between unsteady heat\nrelease and fluid disturbance
  near the flame front may result in\, to some extent\, intrinsic\nthermoac
 oustic instability. Meanwhile\, interactions between acoustic modes of com
 bustor\ncavity and unsteady heat release may generate combustor-induced th
 ermoacoustic\ninstabilities. Their features have been comprehensively anal
 yzed in a uniform-radius\ncombustor with a stationary flame front. The aut
 hor gives mathematical modeling of a\nnonuniform-radius combustor where th
 e flame front is moving. Three tasks are addressed\nin this talk. Firstly\
 , quasi-one-dimensional mathematical modeling of disturbance\ngeneration o
 f acoustic\, entropic and vortical modes caused by unsteady heat release a
 re\ngiven under the consideration of flow separation due to nonuniform-rad
 ius combustor.\nSecondly\, their effects on the intrinsic and combustor-in
 duced thermoacoustic instabilities\nare mathematically modeled. Finally\, 
 attentions are imposed on the interactions between\nthese two types of the
 rmoacoustic oscillations.
LOCATION:CMS\, MR12
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