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UID:0-445@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170329T163000

DTEND;TZID=Asia/Jerusalem:20170329T173000

DTSTAMP:20230603T190220Z

URL:https://aerospace.technion.ac.il/events/theoretical-study-of-the-3-bra
 nches-explosion-limits-of-a-flammable-system/

SUMMARY:Theoretical Study of the 3-branches Explosion Limits of a Flammable
  System
DESCRIPTION:Lecturer:Alon Lidor\n Faculty:Department of Aerospace Engineeri
 ng\n Institute:Technion – Israel Institute of Technology\n Location:Clas
 sroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \
 n Details: \n The phenomenon of explosion (or self-ignition\, not to be co
 nfused with detonation) of fuel mixtures is well known\, both as a desired
  phenomenon\, such as the ignition of the fuel in Diesel engines\, and as 
 a phenomenon to be avoided\, like knocking in SI engines or the risk of fi
 res on oil and gas platforms. The explosion limits are defined as the curv
 e on a pressure-temperature diagram which describes the threshold between 
 the explosive and non-explosive regions of a fuel mixture. These limits ar
 e uniquely defined for a specific fuel-oxidizer pair\, under a specific ra
 tio and are also partially dependent on the vessel wall surface. For hydro
 gen and many hydrocarbon fuels distinctive 3-branched limits exist. Althou
 gh the explosion limits have been studied extensively (experimentally and 
 theoretically) for many years\, there exists no model to date which can ac
 curately predict the explosion limits over the complete range\, capturing 
 this unique branching behavior.\nThis research is composed of theoretical 
 investigation of the explosion limits of an H2-O2 mixture\, with the objec
 tive of understanding fundamental governing physics of the explosion limit
 s\, especially in regards to the uniqueness of the branching limits. We al
 so aim to develop a universal explosion criterion for H2-O2 mixtures\, and
  gain insights into the explosion process for other fuel types. By using a
  novel approach\, combining elements of chain ignition theory and linking 
 between the explosion limits and the ignition delay\, we present a unified
  model capable of accurately predicting the explosion limits of H2-O2 mixt
 ure. We also investigate the effects of fluctuations at the molecular leve
 l\, to evaluate the effect of different impurities in the mixture on the e
 xplosion initiation. Our results from the different models developed and t
 he conclusions and insights gained about the explosion phenomenon will be 
 presented in the talk.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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