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  • Analytical Chemistry and Spectroscopy  (120)
  • AERODYNAMICS  (110)
  • INSTRUMENTATION AND PHOTOGRAPHY  (86)
  • 1
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    Detailed transonic flow field measurements about a supercritical airfoil section (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The transonic flow field about a Whitcomb-type supercritical airfoil profile was measured in detail. In addition to the usual surface pressure distributions and wake surveys, schlieren photographs were taken and velocity vector profiles were determined in the upper surface boundary layer and in the near wake. Spanwise variations in the measured pressures were also determined. The data are analyzed with the aid of an inviscid transonic finite-difference computer program as well as with boundary layer modeling and calculation schemes.
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-3244 , A-5869
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An experimental study of transonic flow about a supercritical airfoil. Static pressure and drag data obtained from tests of a supercritical airfoil and an NACA 0012 airfoil at transonic speeds, supplement (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Surface static-pressure and drag data obtained from tests of two slightly modified versions of the original NASA Whitcomb airfoil and a model of the NACA 0012 airfoil section are presented. Data for the supercritical airfoil were obtained for a free-stream Mach number range of 0.5 to 0.9, and a chord Reynolds number range of 2 x 10 to the 6th power to 4 x 10 to the 6th power. The NACA 0012 airfoil was tested at a constant chord Reynolds number of 2 x 10 to the 6th power and a free-stream Mach number range of 0.6 to 0.8.
    Keywords: AERODYNAMICS
    Type: NASA-TM-81336-SUPPL , A-8762 , NAS 1.15:81336-SUPPL
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Supercritical airfoil flowfield measurements (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Detailed measurements in the transonic flowfield about a Whitcomb-type supercritical airfoil profile are presented including surface pressure distributions, far wake surveys, spark schlieren photographs, and a series of vector velocity profiles in the boundary layer and in the near wake. A flowfield composite for the transonic drag rise condition is constructed from these data. The boundary layer measurements are compared with current correlation and computation schemes, and the importance of viscous thickening effects is demonstrated by the results of wave drag rise calculations for the thickened and unthickened profiles.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 75-880 , American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference; Jun 16, 1975 - Jun 18, 1975; Hartford, CT
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The solvent purity meter and its applications to precision cleaning (1967)
    In:  CASI
    Details
    Publication Date: 2005-11-13
    Description: Solvent purity meters for monitoring nonvolatile residue content of cleaning solvents
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: TAMINATION CONTROL- CURRENT AND ADVANCED CONCEPTS IN INSTRUMENTATION AND AUTOMATION SEP. 1967; P 36-44
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Head-up displays for STOL visual approaches (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-27
    Description: A simulation study was conducted to determine the effectiveness of a simple head-up display in improving glide-slope tracking performance during steep visual approaches in a STOL aircraft. The head-up display featured an attitude-stabilized horizon bar and glide-slope reference bar parallel to and 7.5 deg below the horizon bar. On some approaches a flight-path marker symbol showing the projected ground impact point was also displayed. Half of the approaches were flown in a conventional mode in which the pilot changed pitch attitude to correct for height errors. The remaining approaches were flown in a direct-lift mode in which the pilot modulated thrust to change the flight-path angle without pitching the aircraft.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: STOL Technol.; p 227-243
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Measured transonic unsteady pressures on an energy efficient transport wing with oscillating control surfaces (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Highlight results are presented from subsonic and transonic pressure measurement studies conducted in the Langley Transonic Dynamics Tunnel on a supercritical wing model representative of an energy efficient transport design. Steady- and unsteady-pressure data were acquired on the upper and lower wing surface at an off-design Mach number of 0.60 and at the design Mach number of 0.78, for a Reynolds number of 2.2 x 10(6) (based on the wing average chord). The model configuration consisted of a sidewall-Mounted half-body fuselage and a semi-span wing with an aspect ratio of 10.76, a leading-edge sweepback angle of 28.8 degrees, and supercritical airfoil sections. The wing is instrumented with 252 static pressure orifices and 164 dynamic pressure gages. Model test variables included wing angle of attack, control-surface mean deflection angle, control-surface oscillating deflection angle and frequency, and phasing between oscillating leading-edge and trailing-edge controls when used together.
    Keywords: AERODYNAMICS
    Type: Advan. Aerodyn.: Selected NASA Res.; p 21-36
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Radiometer for remote sounding of the upper atmosphere. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The pressure-modulated carbon dioxide radiometer is a new kind of instrument capable of making temperature soundings in the 40-80-km region of the earth's atmosphere. It is intended to be mounted on a polar-orbiting satellite, where it will give global coverage of the upper atmosphere in a region that is not well understood at present but that is, as rocket soundings show, clearly the seat of many interesting and vigorous phenomena. The new technique employs a cell containing carbon dioxide as a filter. The pressure and hence transmission of this cell is periodically modulated, resulting in the selection of thermal radiation from the strong lines in the spectrum of atmospheric carbon dioxide. This radiation originates at levels in the atmosphere where the pressure is low. The energy grasp of the device is large enough to give high sensitivity.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 11; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Calibrating a hot film anemometer for low velocity measurement in nonisothermal flow (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Calibration data correlation for constant temperature hot film anemometer for low speed nonisothermal laminar air flow, using modified King law
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Anisotropic detector system for the measurement of gamma-ray source position (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Detection efficiencies of cylindrical detectors for various gamma ray photon angular distributions in the energy range from .10 MeV to 15 MeV are studied. It was found that a properly chosen cylindrical crystal can produce a significantly modulated count rate as a function of angle when rotated in the anisotropic flux, The studies further indicate that simple detector systems can be used on small satellites for the determination of a gamma ray source position. Results are outlined and extended to examine source resolution angles for a practical size detector.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Goddard Contrib. to the Los Alamos Conf. on Transient Cosmic Gamma and X-ray Sources; 10 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Low-frequency impedance characteristics of a Langmuir probe in a plasma. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Plasma electron density and temperature from measurement of LF impedance of Langmuir probe, noting ionospheric probing
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
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