Abstract
This experiment uses an infrared imaging system to investigate a subsonic, non-isoenergetic, air/CO2 axisymmetric jet. The classical limitations of using IR imagery with hot gases are presented and a novel approach to overcome these limitations is proposed. The results suggest that radial and axial irradiant profiles measured with the IR imager, when non-dimensionalized, collapse onto curves of similarity. This behavior could allow temperature, velocity, and concentration profiles to be deduced from the IR image.
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Abbreviations
- I :
-
directional, spectral irradiance (Watt/cm2)
- Φ :
-
dimensionless irradiance
- d :
-
nozzle diameter
- x, r :
-
coordinate system
- x 0 :
-
virtual origin displacement
- B :
-
constant
- C :
-
concentration
- T :
-
object temperature (°K)
- U :
-
velocity (m/s)
- ɛ :
-
hemispherical, total emissivity
- PCO2 :
-
partial pressure carbon dioxide
- A:
-
axial profile property
- R:
-
radial profile property
- b:
-
property measured from the background behind the jet
- m:
-
property measured on the jet's centerline axis
- o:
-
property measured at the jet outlet
- t:
-
property measured from the target
- tr:
-
transition region
- amb:
-
property measured in the ambient surroundings
- atm:
-
atmospheric property
- meas:
-
measured property
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Gordge, D.N., Page, R.H. Infrared imagery of an air/CO2 axisymmetric jet. Experiments in Fluids 14, 409–415 (1993). https://doi.org/10.1007/BF00190195
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DOI: https://doi.org/10.1007/BF00190195