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UID:0-239@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20211115T170000

DTEND;TZID=Asia/Jerusalem:20211115T180000

DTSTAMP:20230417T065821Z

URL:https://aerospace.technion.ac.il/events/study-of-the-deflagration-regi
 me-along-the-hugoniot-curve/

SUMMARY:Study of the deflagration regime along the Hugoniot curve
DESCRIPTION:Lecturer:Dina Loktev\n Faculty:Department of Aerospace Engineer
 ing\n Institute:Technion – Israel Institute of Technology\n Location:htt
 ps://technion.zoom.us/j/93264073949\n Zoom: \n Abstract: \n Details: \n A 
 physical approach of calculating the laminar flame speed in homogeneous me
 dium takes into consideration the preservation of Mass\, Energy and Moment
 um\, and using the Ideal Gases relations - yields a system of 4 equations 
 with 5 unknowns\, which can be simplified into the graphic intersection of
  Rankine Lines (denoted from the Rayleigh equation) and the Hugoniot Curve
 . Chapman-Jouguet suggested that the tangent points will determine the fla
 me speed in both regimes\, and while this thesis correctly estimates the D
 etonation speed\, the Deflagration velocity predicted is 2 magnitudes of o
 rder higher than expected. A lot of different approaches were suggested ov
 er the years to correctly forecast the Deflagration velocity\, the leading
  one (up until today) is the Thermal Theory that predicts a good approxima
 tion of the laminar speed but does not conform to the Momentum equation.\n
 Lately\, a new approach relying on thermodynamic stability\, transition ph
 enomena (mass and heat) and the principal of Entropy increase has been sug
 gested. The work was based on introduction of the principals of irreversib
 le thermodynamics\, as formulated by Lars Onsager in the 1930s\, into the 
 Thermal Theory. Validations for Methane-Air lean mixtures showed good resu
 lts.\nThe present study is the first one to apply the new theory and keeps
  developing it. The main achievements:\n\n\n 	cancelation of calibration p
 arameters\n 	Full calculation of the flame front width (using one-step mod
 els for the Reaction Rates)\n 	First application in analytical theories 
 – temperature dependant model for thermodynamic characteristics\n 	Compl
 etion of proof for the Applicability of the new theory\n\nZoom Meeting
CATEGORIES:Seminars
LOCATION:https://technion.zoom.us/j/93264073949

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