Abstract
A swept-beam, two-color particle-imaging velocimetry (PIV) technique has been developed which utilizes a single argon-ion laser for illuminating the seed particles in a flowfield. In previous two-color PIV techniques two pulsed lasers were employed as the different-color light sources. In the present experiment the particles in a two-dimensional shear-layer flow were illuminated using arotating mirror to sweep the 488.0-nm (blue) and 514·5-nm (green) lines of the argon-ion laser through a test section. The blue- and greenparticle positions were recorded on color film with a 35-mm camera. The unique color coding eliminates the directional ambiguities associated with single-color techniques because the order in which the particle images are produced is known. Analysis of these two-color PIV images involved digitizing the exposed film to obtain the blue and green-particle image fields and processing the digitized images with velocity-displacement software. Argon-ion lasers are available in many laboratories; with the addition of a rotating mirror and a few optical components, it is possible to conduct flow-visualization experiments and make quantitative velocity measurements in many flow facilities.
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Abbreviations
- d :
-
length of displacement vector
- d m :
-
distance between rotating mirror and concave mirror
- n f :
-
number of facets on rotating mirror
- R :
-
seed-particle radius
- v :
-
velocity in x, y plane
- v s :
-
sweep velocity of laser beams, assumed to be in y direction from top to bottom of field of view
- v x, v y, v z :
-
x, y, and z components of velocity
- x 1, y 1 :
-
color-1 particle coordinates
- x 2, y 2 :
-
color-2 particle coordinates
- y max :
-
y dimension of field of view, assumed to be the long dimension
- Δs :
-
spatial separation of beams as they approach rotating mirror
- Δt :
-
time separation of laser sheets or of swept beams passing fixed point
- Δt b :
-
time between successive sweeps through test section by same beam
- Δt s :
-
time required for both beams to sweep through test section
- Δθ :
-
angular separation of beams reflecting from rotating mirror
- μ :
-
fluid viscosity
- v :
-
angular velocity of rotating mirror in cycles per second
- ϱ :
-
seed-particle density
- τ :
-
seed-particle response time
- σ v, σ d, σ t :
-
standard deviation of velocity, displacement, and time
- ω :
-
vorticity
References
Adrian, R. J. 1986: Image shifting technique to resolve directional ambiguity in double-pulsed velocimetry. Appl. Opt. 25, 3855–3858.
Adrian, R. J.; Yao, C. S. 1985: Pulsed laser technique application to liquid and gaseous flows and the scattering power of seed materials. Appl. Opt. 24, 44–52.
Boedeker, L. R. 1989: Velocity measurement by H2O photolysis and laser-induced fluorescence of OH. Opt. Lett. 14, 473–475.
Chen, L. D.; Roquemore, W. M. 1986: Visualization of Jet Flames. Combust. Flame 66, 81–86.
Coupland, J. M.; Pickering, C. J. D.; Halliwell, N. A. 1987: Particle image velocimetry: theory of directional ambiguity removal using holographic image separation. Appl. Opt. 26, 1576–1578.
Goss, L. P.; Post, M. E.; Trump, D. D.; Sarka, B.; MacArthur, C. D.; Dunning, G. E. Jr. 1989: A novel technique for blade-to-blade measurements in a turbine cascade. AIAA-89-2691.
Goss, L. P.; Post, M. E.; Trump, D. D.; Sarka, B. 1991: Two-color particle-imaging velocimetry. J. Laser Appl. 3, 36–42.
Gray, C.; Greated, C. A.; McCluskey, D. R.; Easson, W. J. 1991: An analysis of the scanning beam PIV illumination system. Meas. Sci. Technol. 2, 717–724.
Hiller, B.; Booman, R. A.; Hassa, C.; Hanson, R. K. 1984: Velocity visualization in gas flows using laser-induced phosphorescence of biacetyl. Rev. Sci. Instrum. 55, 1964–1967.
Hiller, B.; Hanson, R. K. 1985: Two-frequency laser-induced fluorescence technique for rapid velocity-field measurements in gas flows. Opt. Lett. 10, 206–208.
Hiller, B.; Hanson, R. K. 1988: Simultaneous planar measurements of velocity and pressure fields in gas flows using laser-induced fluorescence. Appl. Opt. 27, 33–48.
Hiller, B. J.; McDaniel, J. C.; Rea, E. C.; Jr Hanson, R. K. 1983: Laser-induced fluorescence technique for velocity field measurements in subsonic gas flows. Opt. Lett. 8, 474–476.
Katta, V. R. 1992: Systems Research Laboratories, Inc., Dayton, Ohio, Private communication.
Kawahashi, M.; Hosoi, K. 1989: Beam-sweep laser speckle velocimetry. Exp. Fluids 8, 109–111.
Kawahashi, M.; Hosoi, K. 1991: Dual-beam-sweep laser speckle velocimetry. Exp. Fluids 11, 278–280.
Landreth, C. C.; Adrian, R. J.; Yao, C. S. 1986: Double-pulsed particle image velocimetry with directional resolution for complex flows. Tenth Biennial Symposium on Turbulence, Rolla, Missouri, 1986.
McDaniel, J. C.; Hiller, B.; Hanson, R. K. 1983: Simultaneous multiple-point velocity measurements using laser-induced iodine fluorescence, Opt. Lett. 8, 51–53.
Meynart, R. 1980: Equal velocity fringes in a Rayleigh-Bernard flow by a speckle method. Appl. Opt. 19, 1385–1386.
Meynart, R. 1993: Instantaneous velocity field measurements in unsteady gas flow by speckle velocimetry. Appl. Opt. 22, 535–540.
Miles, R. B.; Connors J.; Markovitz E.; Howard P.; Roth G. 1989: Instantaneous supersonic velocity profiles in an underexpanded sonic air jet by oxygen flow tagging. Phys. Fluids A 1, 389–393.
Post, M. E. 1994: Two-dimensional velocity fields of vortex structures measured with two-color particle-imaging velocimetry. Ph.D. Dissertation. Cincinnati: University of Cincinnati.
Ruess, D. L.; Adrian R. J.; Landreth C. C.; French D. T.; Fansler T. D. 1989: Instantaneous planar measurements of velocity and largescale vorticity and strain rate in an engine using particle-image velocimetry. SAE Technical Paper 890616.
Smallwood, G. J. 1992: A technique for two-color particle image velocimetry. Masters Thesis, Ottawa, Ontario, Canada: University of Ottawa.
Warnet, M. P.; Edwards, R. V. 1990: New space domain processing technique for pulsed laser velocimetry. Appl. Opt. 29, 3399–3417.
Yao, C. S.; Adrian, R. J. 1984: Orthogonal compression and 1-D analysis technique for measurement of 2-D particle displacements in pulsed laser velocimetry. Appl. Opt. 23, 1687–1689.
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This work was supported, in part, by the Aero Propulsion and Power Directorate of Wright Laboratory under Contract No. F33615-90-C-2033.
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Post, M.E., Trump, D.D., Goss, L.P. et al. Two-color particle-imaging velocimetry using a single argon-ion laser. Experiments in Fluids 16, 263–272 (1994). https://doi.org/10.1007/BF00206546
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DOI: https://doi.org/10.1007/BF00206546