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  • 1
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    Correcting For Seed-Particle Lag In LV Measurements (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two experiments conducted to evaluate effects of sizes of seed particles on errors in LV measurements of mean flows. Both theoretical and conventional experimental methods used to evaluate errors. First experiment focused on measurement of decelerating stagnation streamline of low-speed flow around circular cylinder with two-dimensional afterbody. Second performed in transonic flow and involved measurement of decelerating stagnation streamline of hemisphere with cylindrical afterbody. Concluded, mean-quantity LV measurements subject to large errors directly attributable to sizes of particles. Predictions of particle-response theory showed good agreement with experimental results, indicating velocity-error-correction technique used in study viable for increasing accuracy of laser velocimetry measurements. Technique simple and useful in any research facility in which flow velocities measured.
    Keywords: MECHANICS
    Type: LAR-14497 , Laser Tech. Brief.; 2; 3; P. 78
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Measuring Tollmien-Schlichting Instabilities In Laminar Flow (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: NASA flight experiment conducted to evaluate surface-mounted hot-film sensors designed to detect Tollmien-Schlichting (T-S) instability in boundary layer in flight. New technique has considerable value in applied research aimed at extending regions of natural laminar flow on aircraft. Aids research into mechanisms leading to transition from laminar to turbulent boundary layers. Makes it practical to take measurements in many locations on wing surface for tests in flight. Useful in studying transitions in such flow as those in pipes, ducts, channels, compressors, and diffusers.
    Keywords: MECHANICS
    Type: LAR-14132 , NASA Tech Briefs (ISSN 0145-319X); 17; 1; P. 73
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Laminar-Separation Sensor (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Sensor detects flow reversal in boundary layer. Laminar-separation sensor provides means for detecting laminar-separation bubble by use of very thin, surface-mounted sensor. Consists of flush array of three proximate thin films. Middle film electronically heated by means of constant-temperature anemometer (CTA). Outer films, one upstream and one downstream of middle film, incorporated into bridge circuit to respond as resistance thermometers. This sensor provides only known surface-mounted means for positively identifying pressure of laminar separation as cause of boundary-layer transition.
    Keywords: MECHANICS
    Type: LAR-13463 , NASA Tech Briefs (ISSN 0145-319X); 12; 8; P. 72
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Coatings Show Laminar Boundary-Layer Transitions (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: New method, utilizing liquid-crystal coatings, provides means to visualize transition in flight. Difference in levels of relative shear stress or skin friction between laminar and turbulent boundary layers one order of magnitude. Difference in skin friction is physical parameter to which liquid crystals respond. Transition measured and documented on aircraft in flight at altitudes above 20,000 ft., up to at least 50,000 ft. at subsonic and supersonic speeds. Technique has rapid response and reversible; capability of indicating unlimited number of transition locations during single flight.
    Keywords: MECHANICS
    Type: LAR-13554 , NASA Tech Briefs (ISSN 0145-319X); 11; 8; P. 60
    Format: text
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  • 5
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    Laminar-Boundary-Layer Crossflow Sensor (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Crossflow vorticity detected with nonintrusive electronic sensor elements. Individual crossflow sensor elements respond to variation in heat transfer caused by laminar-crossflow vortexes. Installed in variety of patterns, including staggered or combined into continuous longitudinal strip.
    Keywords: MECHANICS
    Type: LAR-13436 , NASA Tech Briefs (ISSN 0145-319X); 12; 1; P. 81
    Format: text
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    NASA TECHNICAL REPORTS
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