Abstract

A technique is described for imaging the injectant mole-fraction distribution in nonreacting compressible mixing flow fields. Planar fluorescence from iodine, seeded into air, is induced by a broadband argon-ion laser and collected using an intensified charge-injection-device array camera. The technique eliminates the thermodynamic dependence of the iodine fluorescence in the compressible flow field by taking the ratio of two images collected with identical thermodynamic flow conditions but different iodine seeding conditions. The resulting images are, to our knowledge, the first quantitative planar measurements of mole-fraction distributions in a nonreacting compressible flow field and allow mixing to be studied directly.

© 1989 Optical Society of America

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References

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  1. N. L. Rapagnani, S. L. Davis, Lasers Appl. 5, 127 (1985).
  2. B. Hiller, R. K. Hanson, Appl. Opt. 27, 33 (1988).
    [CrossRef] [PubMed]
  3. J. C. McDaniel, AIAA Paper 83-0049 (American Institute of Aeronautics and Astronautics, New York, 1983).
  4. J. C. McDaniel, J. Graves, J. Propulsion Power 4, 591 (1988).
    [CrossRef]
  5. R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).
  6. D. G. Fletcher, “Spatially-resolved, nonintrusive measurements in a nonreacting scramjet combustor using laser-induced iodine fluorescence,” Ph.D. dissertation (University of Virginia, Charlottesville, Va., 1989).
  7. J. C. McDaniel, “Investigation of laser-induced iodine fluorescence for the measurement of density in compressible flows,” Ph.D. dissertation (Stanford University, Stanford, Calif., 1981).

1988

B. Hiller, R. K. Hanson, Appl. Opt. 27, 33 (1988).
[CrossRef] [PubMed]

J. C. McDaniel, J. Graves, J. Propulsion Power 4, 591 (1988).
[CrossRef]

1985

N. L. Rapagnani, S. L. Davis, Lasers Appl. 5, 127 (1985).

Davis, S. L.

N. L. Rapagnani, S. L. Davis, Lasers Appl. 5, 127 (1985).

Fletcher, D. G.

D. G. Fletcher, “Spatially-resolved, nonintrusive measurements in a nonreacting scramjet combustor using laser-induced iodine fluorescence,” Ph.D. dissertation (University of Virginia, Charlottesville, Va., 1989).

Graves, J.

J. C. McDaniel, J. Graves, J. Propulsion Power 4, 591 (1988).
[CrossRef]

Hanson, R. K.

Hiller, B.

McDaniel, J. C.

J. C. McDaniel, J. Graves, J. Propulsion Power 4, 591 (1988).
[CrossRef]

J. C. McDaniel, AIAA Paper 83-0049 (American Institute of Aeronautics and Astronautics, New York, 1983).

J. C. McDaniel, “Investigation of laser-induced iodine fluorescence for the measurement of density in compressible flows,” Ph.D. dissertation (Stanford University, Stanford, Calif., 1981).

R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).

Northam, G. B.

R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).

Rapagnani, N. L.

N. L. Rapagnani, S. L. Davis, Lasers Appl. 5, 127 (1985).

Uenishi, K.

R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).

Whitehurst, R. B.

R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).

Appl. Opt.

J. Propulsion Power

J. C. McDaniel, J. Graves, J. Propulsion Power 4, 591 (1988).
[CrossRef]

Lasers Appl.

N. L. Rapagnani, S. L. Davis, Lasers Appl. 5, 127 (1985).

Other

J. C. McDaniel, AIAA Paper 83-0049 (American Institute of Aeronautics and Astronautics, New York, 1983).

R. B. Whitehurst, J. C. McDaniel, K. Uenishi, G. B. Northam, AIAA Paper 87-2163 (American Institute of Aeronautics and Astronautics, New York, 1987).

D. G. Fletcher, “Spatially-resolved, nonintrusive measurements in a nonreacting scramjet combustor using laser-induced iodine fluorescence,” Ph.D. dissertation (University of Virginia, Charlottesville, Va., 1989).

J. C. McDaniel, “Investigation of laser-induced iodine fluorescence for the measurement of density in compressible flows,” Ph.D. dissertation (Stanford University, Stanford, Calif., 1981).

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Figures (2)

Fig. 1
Fig. 1

(a) Digital image of iodine fluorescence in a plane containing jet centerlines with only the jets seeded, (b) The same as in (a) but with the entire flow seeded, (c) The ratio of the image in (a) to the image in (b), which is a quantitative representation of the injectant mole-fraction distribution in this plane.

Fig. 2
Fig. 2

(a) Digital image of iodine fluorescence in the plane parallel to and one jet diameter away from the injector wall with only the jets seeded, (b) The same as in (a) but with the entire flow seeded, (c) The ratio of the image in (a) to the image in (b), which is a quantitative representation of the injectant mole-fraction distribution in this plane.

Equations (4)

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S f = CI ( X ) A 21 A 21 + Q F 1 N I 2 ,
S f JET S f TOTAL = N I 2 JET N I 2 TOTAL .
N I 2 = f s N ,
N JET N TOTAL = C S f JET S f TOTAL ,

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