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An efficient optical pressure measurement in compressible flows: Laser-induced iodine fluorescence

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Abstract

The understanding of complex phenomena, the experimental validation of calculation codes, and the construction of data bases in fluid mechanics require the development of non-intrusive experimental techniques. The laser-induced fluorescence of a gaseous molecule seeded into a gas flow can be related to the flowfield thermodynamic parameters, such as pressure and temperature. An experimental method is described, that allows the removal of the temperature dependence of the fluorescence signal. A narrow-bandwidth single-line laser is tuned to the center of an absorption line, whose temperature dependence of the Boltzmann fraction can be neglected. The experimental set-up requires a single-line dye laser and a high resolution spectral analysis device.

The accuracy of the method, checked in a static vessel, appears to be better than 5%. The method has been successfully tested with a supersonic jet issuing from an underexpanded nozzle.

The experimental results have been compared to those of an Euler calculation. A mean difference of 14% has been observed, but a major part of this can be attributed to the difference between inviscid and real gas calculation.

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Abbreviations

A 21 :

spontaneous emission Einstein coefficient

B v :

rotational energy of the J level for the v vibrational level

B e :

first order approximation of B v

c :

velocity of light

C opt :

optical constant

E(v) :

vibrational energy of the v level

f 1 :

Boltzmann fraction

FCF i :

Franck-Condon factor of the ith line

f v :

vibrational fraction

tf r :

rotational fraction

g :

efficient spectral power density

h :

Planck constant

I 2 X :

iodine molecule in the X state

I 2 B :

iodine molecule in the B state

[I 2 X]:

molecular concentration of I 2 X

[I 2 B]:

molecular concentration of I 2 B

I i :

relative intensity of the ith absorption line

J″:

rotational level of the fundamental state

J′:

rotational level of the excited state

k :

Boltzmann constant

k c :

collisional broadening coefficient

m :

iodine molecular mass

n 0 :

initial concentration of iodine in the absorbing state

P :

pressure

P laser :

laser power

P l(v) :

laser power spectral density

P sl2 :

iodine vapor pressure

Q :

quenching rate

Q v :

vibrational partition function

T :

temperature

v″:

vibrational level of the fundamental state

v′:

vibrational level of the excited state

V c :

collection volume

X l 2 :

iodine molar fraction

λ :

wave length

Δv D :

Doppler linewidth, at half maximum

Δv c :

collisional linewidth at half maximum

Vl :

laser frequency

δ(v) :

Dirac function

Δv i :

spectral location of a line, referenced to the laser frequency

References

  • Allen MG; Parker TE; Reinecke WG; Legner HH; Foutter RR; Rawlins WT; Davis SJ (1993) Fluorescence imaging of OH and NO in a model supersonic combustor. AIAA J 31: 505–512

    Google Scholar 

  • Herzberg (1951) Spectra of diatomic molecules, Second Edition, D Van Nostrand Compagny

  • Hiller B; Booman RA; Hassa C; Hanson RK (1984) Velocity visualization in gas flows using laser-induced phosphorescence of blacethyl. Rev Sci Instrum 55: 1664–1669

    Google Scholar 

  • Hiller B; Kanson RK (1988) Simultaneous planar measurements of velocity and pressure fields in gas flows using laser-induced fluorescence, Applied Optics 27: 33–48

    Google Scholar 

  • Hiller B; Kanson RK (1990) Properties of iodine molecule relevant to laser induced fluorescence experiments in gas flows, Exp Fluids 10: 1–11

    Google Scholar 

  • Lemoine F; Leporcq B (1993) Optical pressure measurement using laser iodine induced fluorescence, La Recherche Aérospatiale 1: 51–59

    Google Scholar 

  • McDaniel JC (1982) Investigation of laser-induced fluorescence for the measurement of density in compressible flows, PhD Thesis Stanford University

  • McDaniel JC (1983a) Nonintrusive pressure measurements with laser-induced fluorescence, AIAA Paper no. 83-1468

  • McDaniel JC (1983b) Quantitative measurement of density and velocity in compressible flows using laser-induced iodine fluorescence, AIAA Paper no. 83-0049

  • McKenzie RL (1993) Progress in laser spectroscopic techniques for aerodynamic measurements: an overview, AIAA J 31: 465–477

    Google Scholar 

  • Pascal P Nouveau traité de chimie minérale, Propriétés physiques de l'iode, Masson & cie

  • Paul PH; Hanson RK (1990) Applications of planar laser induced fluorescence diagnostics to reacting flows AIAA Paper no. 90-1848

  • Rapagnani NL; Davis SJ (1980) Flow visualisation in supersonic flows, Laser Probes for Combustion Chemistry, ACS Symposium Series, no. 134: 168–172

  • Rapagnani NL; Davis SJ (1985) Laser-induced fluorescence: a diagnostic for fluid Mechnics, Lasers and Applications, May issue, 127–131

  • Simmons JD; Hougen JT (1977) Atlas of the l 2 spectrum from 19000 to 18000 cm−1, Journal of Research of the National Bureau of Standards-A. Physics and Chemistry 81A: 25–80

    Google Scholar 

  • Tellinghuisen J (1977) Intensity factors for the l 2 B ⇔ X band system, J Quant Spectrosc Radiat Transfer 19: 149–161

    Google Scholar 

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Authors and Affiliations

  1. Office National d'Etudes et de Recherches Aérospatiale, Institut de Mécanique des Fluides de Lille, 5, Boulevard Paul Painlevé, F-59045, Lille Cedex, France

    F. Lemoine & B. Leporcq

Authors
  1. F. Lemoine
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  2. B. Leporcq
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Lemoine, F., Leporcq, B. An efficient optical pressure measurement in compressible flows: Laser-induced iodine fluorescence. Experiments in Fluids 19, 150–158 (1995). https://doi.org/10.1007/BF00189703

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  • DOI: https://doi.org/10.1007/BF00189703

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