Abstract

Experimental results in a uniform, supersonic, free-jet flow containing water vapor show that enhancement of OH concentration by focused UV photodissociation of for velocity H2O at 248 nm is an excellent tagging mechanism measurements. Two-dimensional images of OH fluorescence with a vidicon show a narrow initial enhanced OH zone along a straight line limited by the jet diameter. Fluorescence induced by a time-delayed pulsed dye laser documents the convection of this enhanced OH by the uniform core flow and reveals sharply stretched edge regions due to the shear layer with ambient air. The core flow velocity measurements are in agreement with predicted values.

© 1989 Optical Society of America

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References

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  1. J. A. Shirley, L. R. Boedeker, in AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference (American Institute of Aeronautics and Astronautics, New York, 1988), paper AIAA-88-3038.
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    [CrossRef] [PubMed]
  3. R. J. Exton, M. E. Hillard, Appl. Opt. 25, 14 (1986).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  5. M. O. Rogers, K. Asai, D. D. Davis, Appl. Opt. 19, 3597 (1980).
    [CrossRef]
  6. G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
    [CrossRef]
  7. P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
    [CrossRef]

1988 (1)

1987 (1)

1986 (2)

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

R. J. Exton, M. E. Hillard, Appl. Opt. 25, 14 (1986).
[CrossRef] [PubMed]

1983 (1)

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

1980 (1)

Andresen, P.

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

Asai, K.

Bath, A.

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

Boedeker, L. R.

J. A. Shirley, L. R. Boedeker, in AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference (American Institute of Aeronautics and Astronautics, New York, 1988), paper AIAA-88-3038.

Cohen, C.

Connors, J.

Davis, D. D.

Defrance, P.

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

Exton, R. J.

Hanson, R. K.

Hillard, M. E.

Hiller, B.

Howard, P.

Huang, S.

Markovitz, E.

McGowan, J. W.

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

Meijer, G.

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

Miles, R.

Mitchell, J. B. A.

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

Mul, P. M.

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

Rogers, M. O.

Russell, G.

Shirley, J. A.

J. A. Shirley, L. R. Boedeker, in AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference (American Institute of Aeronautics and Astronautics, New York, 1988), paper AIAA-88-3038.

ter Meulen, J. J.

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

Appl. Opt. (3)

J. Chem. Phys. (1)

G. Meijer, J. J. ter Meulen, P. Andresen, A. Bath, J. Chem. Phys. 85, 6914 (1986).
[CrossRef]

J. Phys. B (1)

P. M. Mul, J. W. McGowan, P. Defrance, J. B. A. Mitchell, J. Phys. B 16, 3099 (1983).
[CrossRef]

Opt. Lett. (1)

Other (1)

J. A. Shirley, L. R. Boedeker, in AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference (American Institute of Aeronautics and Astronautics, New York, 1988), paper AIAA-88-3038.

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Figures (4)

Fig. 1
Fig. 1

Supersonic nozzle with excimer- and dye-laser beams.

Fig. 2
Fig. 2

Computer-processed two-dimensional vidicon results, Inside the enhanced OH zones the intensity increases from the light to dark shading.

Fig. 3
Fig. 3

Single-track, one-dimensional vidicon results for three delay times at one velocity. The first pulse at each delay is excimer-laser-induced OH fluorescence, and the second pulse is dye-laser-induced OH fluorescence.

Fig. 4
Fig. 4

Correlation of distance between the excimer-laser and dye-laser OH fluorescence peak locations on a vidicon with the delay time between the excimer and dye lasers.

Tables (1)

Tables Icon

Table 1 Supersonic Steam Jet Conditions

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