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  • 1
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    Seeding subsonic, transonic and supersonic flows with 0.5 micron polystyrene spheres (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Polystyrene latex particles have been successfully used as laser velocimetry seed material for flows in the Ames High Reynolds Channels (HR) 1 and 2, the pilot channel, and the one-foot low speed tunnel. These facilities provide test flows with Mach numbers from 0.1 to 3.0 and test section sizes from 4 inches by 6 inches to 18 inches by 24 inches. Tunnel mass flow in the HR-2 channel can approach 1000 lb/sec. The latex particles have the following favorable characteristics: size of 0.35 to 0.55 microns diameter; spherical shape; specific gravity of 1.05; excellent flow trackability; low toxicity; and low cost. they have the disadvantage of being packaged as an aqueous suspension which must be diluted and introduced into the test flow as an atomized mist. This must occur sufficiently far upstream of the test section to minimize flow disturbances and permit the liquid mist to evaporate before reaching the model. Several techniques which have been developed to accomplish satisfactory seeding will be described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center Wind Tunnel Seeding Systems for Laser Velocimeters; p 179-187
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of a new laser Doppler velocimeter for the Ames High Reynolds Channel No. II (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A new two-channel laser Doppler velocimeter developed for the Ames High Reynolds Channel No. 2 is described. Design features required for the satisfactory operation of the optical system in the channel environment are discussed. Fiber optics are used to transmit the megahertz Doppler signal to the photodetectors located outside the channel pressure vessel, and provision is made to isolate the optical system from pressure and thermal strain effects. Computer-controlled scanning mirrors are used to position the laser beams in the channel flow. Techniques used to seed the flow with 0.5-micron-diam polystyrene spheres avoiding deposition on the test-section windows and porous boundary-layer removal panels are described. Preliminary results are presented with a discussion of several of the factors affecting accuracy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Development of a new laser Doppler velocimeter for the Ames High Reynolds Channel No. 2 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new two-channel laser Doppler velocimeter developed for the Ames High Reynolds Channel No. 2 is described. Design features required for the satisfactory operation of the optical system in the channel environment are discussed. Fiber optics are used to transmit the megahertz Doppler signal to the photodetectors located outside the channel pressure vessel, and provision is made to isolate the optical system from pressure and thermal strain effects. Computer-controlled scanning mirrors are used to position the laser beams in the channel flow. Techniques used to seed the flow with 0.5-micron-diam polystyrene spheres avoiding deposition on the test-section windows and porous boundary-layer removal panels are described. Preliminary results are presented with a discussion of several of the factors affecting accuracy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-86772 , REPT-85289 , NAS 1.15:86772
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Inertia diaphragm pressure transducer Patent (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Design and development of inertia diaphragm pressure transducer
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 5
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    Application of laser velocimetry to an unsteady transonic flow (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of mean velocity, turbulent kinetic energy, and turbulent shear stress have been obtained in an unsteady but periodic flow. Polystyrene spheres, 0.35-0.55 microns in diameter, were injected into the tunnel settling chamber to seed the flow for a laser velocimeter. Synchronized counters together with an encoding interface and digital-to-analog converters were used to record the data on an analog tape recorder. Profiles of velocity and turbulence quantities are presented for several times during the periodic flow.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''79; International Congress on Instrumentation in Aerospace Simulation Facilities; Sep 24, 1979 - Sep 26, 1979; Monterey, CA
    Format: text
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