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UID:0-446@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170213T163000

DTEND;TZID=Asia/Jerusalem:20170213T173000

DTSTAMP:20230603T190238Z

URL:https://aerospace.technion.ac.il/events/plasma-assisted-ignition-funda
 mentals-and-applications-in-subsonic-and-supersonic-flows/

SUMMARY:Plasma-assisted Ignition: Fundamentals and Applications in Subsonic
  and Supersonic Flows
DESCRIPTION:Lecturer:Joseph Lefkowitz\n Faculty:Air Force Research Laborato
 ry\, Hypersonic Sciences Branch\n Institute:Wright-Patterson Air Force Bas
 e\, OH\n Location:Classroom 165\, ground floor\, Library\, Aerospace Eng.\
 n Zoom: \n Abstract: \n Details: \n The application of novel plasma device
 s has shown promise for the enhancement of ignition and flame-holding in c
 ombustion systems. However\, the mechanism by which different discharge ty
 pes interact with the combustion process is still largely unknown. This wo
 rk explores the plasma/combustion interaction of nanosecond duration disch
 arges utilizing both high density localized discharges and low density dif
 fuse discharges in subsonic and supersonic flows. A variety of optical tec
 hniques\, including tunable diode laser absorption spectroscopy (TDLAS)\, 
 kilohertz rate OH planar laser induced fluorescence (PLIF)\, optical emiss
 ion spectroscopy (OES)\, high speed schlieren imaging\, and chemiluminesce
 nce imaging are used to explore the plasma and combustion processes in sit
 u. In high density discharges\, it is found that repetitive application of
  the nanosecond discharges leads to improved ignition probability and flam
 e-development time at high pulse frequencies (&gt\;10 kHz)\, indicating so
 me pulse-to-pulse coupling important for the ignition process. To explore 
 the kinetics involved in this process\, molecular concentration measuremen
 ts are utilized to track species evolution in the plasma\, and a modeling 
 architecture and kinetic model are developed to shed light on the reaction
  scheme. It is found that high energy electrons initiate chain propagating
  or branching reactions which can maintain oxidation at temperatures far b
 elow the autoignition threshold. In high frequency pulsing\, these kinetic
  effects result in a positive feedback loop in which radical species are p
 roduced by both the plasma and combustion reaction processes in series\, l
 eading to the observed ignition enhancement.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20161030T010000

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