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SUMMARY:Modelling of Indirect Combustion Noise - Juan Guzman (Imperial Col
 lege London)
DTSTART:20210511T110000Z
DTEND:20210511T120000Z
UID:TALK160153@talks.cam.ac.uk
CONTACT:Mungo G. Aitken
DESCRIPTION:The aero-engine noise due to combustion can be separated into 
 direct and indirect sources. The first component designates the generation
  of pressure fluctuations due to unsteady heat released by the flame. Unst
 eady combustion also generates flow perturbations in the form of temperatu
 re\, vorticity\, and mixture-composition inhomogeneities. These perturbati
 ons\, which are silent while advected by a uniform flow\, generate further
  sound when accelerated/decelerated. This second source of noise is termed
  indirect combustion noise. Indirect combustion noise contributes to the t
 otal exhaust noise of aero-engines\, via the downstream propagating compon
 ent\, and modifies the stability of the combustor\, via the upstream propa
 gating one. \n\nTo date\, indirect combustion noise has been studied mostl
 y in configurations where the flow perturbations are accelerated by nozzle
 s. In such configurations\, the flow can be described by quasi-one-dimensi
 onal and isentropic equations. Those assumptions\, however\, are too restr
 ictive for realistic combustors. In this talk\, we will present recent pro
 gress on the modelling of indirect noise beyond such assumptions. In parti
 cular\, we will study the indirect noise generated at the turbine blade ro
 ws and area expansions with flow separation. \n
LOCATION:Zoom
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