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TZID:Asia/Jerusalem

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UID:0-379@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180530T163000

DTEND;TZID=Asia/Jerusalem:20180530T173000

DTSTAMP:20230527T140626Z

URL:https://aerospace.technion.ac.il/events/turbulence-droplets-and-the-st
 ability-of-reacting-flows/

SUMMARY:Turbulence\, Droplets and the Stability of Reacting Flows
DESCRIPTION:Lecturer:Yuval Dagan\n Faculty:Department of Mechanical Enginee
 ring\n Institute:Massachusetts Institute of Technology – MIT\n Location:
 Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstrac
 t: \n Details: \n The interaction between turbulence\, chemical kinetics a
 nd droplet dynamics plays an important role in reacting flows and can lead
  to instability. Understanding the underlying mechanisms that drive these 
 processes is critical for predicting and controlling them\, and may signif
 icantly enhance combustion efficiency which is a crucial design parameter 
 for gas-turbines and propulsion systems.\nIn this talk\, I will present re
 sults from theoretical and experimental studies of different reacting flow
  configurations. Employing large eddy simulations\, we show that under lea
 n premixed conditions the dynamic response of a turbulent reactive flow is
  strongly impacted by the fuel chemistry. In order to gain insight into so
 me of the underlying mechanisms we formulate a new linear stability model 
 that incorporates the impact of finite rate chemistry on the hydrodynamic 
 stability of shear flows. In contrast to previous studies which typically 
 assume that the velocity field is independent of the kinetic rates\, tempe
 rature coupled mechanisms are accounted for through a variable density Nav
 ier-Stokes formulation. This formulation is shown to agree with results of
  our recent experimental and computational studies and suggests a physical
  explanation for the observed impact of finite rate chemistry on turbulent
  shear flow instability.\nAdding particles and droplets to the reactive fl
 ow may alter its structure and stability. I will revisit Saffman’s semin
 al work on the stability of particle-laden flows\, and present a new conce
 pt for the analysis of hydrodynamic stability of multiphase flows using th
 e sectional approach. Preliminary results reveal the impact of droplet eva
 poration on the stability of the Hagen-Poiseuille flow. Remarkably\, while
  the addition of non-evaporating particles tends to stabilize the flow\, v
 olatile droplets of the same size can destabilize the flow. This may also 
 imply an earlier transition to turbulence in flows advecting volatile drop
 lets.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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