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UID:0-414@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170809T163000

DTEND;TZID=Asia/Jerusalem:20170809T173000

DTSTAMP:20230530T180123Z

URL:https://aerospace.technion.ac.il/events/ir-radiometry-of-a-premixed-co
 2-air-jet-towards-gas-temperature-reconstruction/

SUMMARY:IR Radiometry of a Premixed CO2-Air Jet Towards Gas Temperature Rec
 onstruction
DESCRIPTION:Lecturer:Matan Jacoby\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n The study and optimization of combustion processes require
 s precise knowledge of the temperature and species’ concentration fields
 . In such applications\, measurements are often taken locally by intrusive
  techniques that affect the aero-thermal field of interest and lack spatia
 l resolution. Thus\, for high fidelity analysis and for physically inacces
 sible regions\, there is much value in developing non-intrusive measuremen
 t alternatives.\nIn order to probe combustion processes\, the most promine
 nt species is CO2\, which radiates within ~4.3µm wavelength band where t
 he absorption of other atmospheric gases is negligible. This emission of C
 O2 is considered in context of an axisymmetric free jet\, a common geomet
 ry of interest - mimicking the exhaust plume of many thermodynamic cycles.
  By establishing a validated model for CO2 emissivity and developing a me
 thod which extends radiation thermometry to gases\, the research effort 
 focuses on a measurement technique to reconstruct the temperature distribu
 tion of a steady jet with known source CO2 and air mixture concentratio
 ns in the upstream supply line.\nThe experimental setup consists of a free
  jet produced by an orifice. CO2 - air gasses flow into a mixing chamber\,
  the flow rates of which are adjusted independently. The mixture temperatu
 re is regulated by an electric heater. The resulting jet flow temperature 
 is monitored by traverses of a thermocouple probe. The emitted radiation f
 lux is measured by an IR camera.\nThe HITRAN/HITEMP database\, which inclu
 des line-by-line spectroscopic parameters for high resolution molecular ab
 sorption and radiance calculations\, is used to predict and simulate the s
 pectral emission and transmission of the jet as well as the atmospheric pa
 th. The species’ diffusion in the jet is modeled via correlation with th
 e local temperature gradients. Then\, all the unknowns can be related to g
 eometric variables obtained from integral radiation flux measurements\, an
 d to local temperature distributions which are optimized to yield minimum 
 deviation from the integral observations.\nGiven an approximation of atmos
 pheric temperature\, pressure and composition (typically known in most sen
 sing applications)\, as well as an estimate of upstream CO2 concentration\
 , the jet temperature distribution is reconstructed from integral IR camer
 a radiation flux measurements\, absent of per-scenario calibration. Finall
 y\, the assumption of known supply CO2 concentration may be relaxed to im
 prove precision and utility\, by applying additional camera observations w
 ith multiple optical filters.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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