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UID:0-411@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170912T103000

DTEND;TZID=Asia/Jerusalem:20170912T113000

DTSTAMP:20230530T180015Z

URL:https://aerospace.technion.ac.il/events/three-methods-to-tackle-noise-
 thermoacoustic-instabilities-and-sensitivity-in-aero-engines-quantum-mecha
 nics-chaos-theory-and-numerical-simulations/

SUMMARY:Three Methods to Tackle Noise\, Thermoacoustic Instabilities and Se
 nsitivity in Aero-Engines: Quantum Mechanics\, Chaos Theory and Numerical 
 Simulations
DESCRIPTION:Lecturer:Dr. Luca Magri\n Faculty:Engineering Department\n Inst
 itute:University of Cambridge\, UK\n Location:Classroom 165\, ground floor
 \, Library\, Aerospace Eng.\n Zoom: \n Abstract: \n Details: \n The dynami
 cs of aircraft-propulsion flows is difficult to understand because of the 
 intertwined interactions between the acoustics\, combustion and hydrodynam
 ics. The understanding\, modeling and control of these flows are in consta
 nt development. In this talk\, the multi-physics of such flows is tackled 
 from angles that are different from the traditional paradigms.\n\nThe gene
 ration of sound at the combustor’s exit\, which contributes to noise pol
 lution\, is investigated in the first part of the talk. The question that 
 will be addressed is “Are there sources of sound due to combustion that 
 have not been identified yet?” By considering a multi-component gas\, su
 ch as that of a combustion chamber\, a new supersonic-nozzle acoustic mode
 l is proposed. By drawing analogies from Quantum Mechanics\, a solution is
  found. It is shown that differences in the gas composition generate indir
 ect noise when accelerated through the nozzle\, which may be louder than t
 he sound generated by traditional mechanisms.\n\nIn the second part of the
  talk\, the focus is on the sound waves that are reflected at the combusto
 r’s exit back to the combustion chamber. These waves may cause thermoaco
 ustic instabilities\, which are one of the most intractable problems faced
  by gas-turbine and rocket-motor manufactures. This is due to the sheer nu
 mber of parameters that come into play and influence the stability. Adjoin
 t methods and inverse design have recently attracted attention in thermoac
 oustics because they offer accurate sensitivity information to this sheer 
 number of parameters. With this information\, the control\, probabilistic 
 sensitivities and physical understanding of thermacoustic instabilities\, 
 also in the presence of symmetry breaking\, are enabled. Lyapunov analysis
  from chaos theory is applied to a turbulent reacting-flow simulation.\n\n
 The methods presented in this talk are applied to modelling\, control and 
 optimization of reacting\, multi-physical flows in propulsion systems.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20170324T030000

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