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  • AERODYNAMICS  (381)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1985-1989
  • 1975-1979  (616)
  • 1978  (616)
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  • 1985-1989
  • 1975-1979  (616)
Year
  • 1
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    Theoretical response of condenser microphones (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Modifications to prior theory yield expressions for the frequency response and equivalent lumped elements of a condenser microphone in terms of its fundamental geometrical and material properties. Results of the analysis show excellent agreement with experimental data taken on B&K pressure microphone types 4134 and 4146.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Acoustical Society of America; vol. 64
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Wake flow measurements with a mobile laser Doppler velocimeter system (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Wake flow measurements were conducted with a mobile laser Doppler velocimeter (LDV). The measurements included surveys of aircraft wake vortices behind a B-747 aircraft, aircraft carrier wake measurements from aboard the U.S.S. Nimitz, and tower wake measurements for a 100 kW wind turbine. Results of these tests demonstrated that a mobile ground-based LDV is a versatile and useful tool for the measurement of full-scale three-dimensional wake flows. The potential is demonstrated for utilization of this system to study complex wakes for a variety of applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 78-823 , Aerodynamic Testing Conference; Apr 19, 1978 - Apr 21, 1978; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Simultaneous velocity and particle size measurement in two phase flows by Laser Anemometry (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A technique for particle size measurement by using Laser Doppler Anemometry is discussed. An additional gate photomultiplier has been introduced at right angles to the optical axis in order to select only those particles passing through the central region of the measurement control volume. Particle sizing measurements have been made in sprays of glass particles using the modified Laser Anemometry system. Measurements in fuel sprays are also reported and compared with the results obtained by a photographic technique. The application of the particle sizing technique to opaque particles is investigated and suitable optical arrangements are suggested. Light scattering characteristics of Laser Anemometry systems for different optical geometries are calculated to select the optimum optical arrangement for the particle sizing measurements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 78-74 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Versatile LDV burst simulator (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A device for generating burst signals is reported that can be used to determine whether or not a laser Doppler velocimeter is operating properly. A high frequency signal which corresponds to the information frequency of the laser Doppler velocimeter is modulated by a low frequency signal to provide an envelope for the high frequency signal. The high frequency signal is modulated by any modulator means such as, for example, an analog multiplier. The low frequency signal is added to the modulated signal to provide pedestals for the resulting series of burst pulses. The means are provided for selecting different combinations of these burst signals. Also means are provided for making the burst signals asymmetrical as desired. In addition, means are provided for varying the frequencies, and amplitudes of the information, envelope and pedestal frequency signals in the burst signals.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Effects of spanwise nozzle geometry and location on the longitudinal aerodynamic characteristics of a vectored-engine-over-wing configuration at subsonic speeds (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A V/STOL tunnel study was performed to determine the effects of spanwise blowing on longitudinal aerodynamic characteristics of a model using a vectored-over-wing powered lift concept. The effects of spanwise nozzle throat area, internal and external nozzle geometry, and vertical and axial location were investigated. These effects were studied at a Mach number of 0.186 over an angle-of-attack range from 14 deg to 40 deg. A high pressure air system was used to provide jet-exhaust simulation. Engine nozzle pressure ratio was varied from 1.0 (jet off) to approximately 3.75.
    Keywords: AERODYNAMICS
    Type: NASA-TP-1215 , L-12015
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Some contemplated improvements to the prototype Lixiscope (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some contemplated improvements on the Lixiscope are described. These can be divided roughly into two categories: those which are well within existing technology, and thus can be implemented immediately; and those which are more at the state-of-the-art level, and which are directly related to applications in X-ray and gamma ray imaging in astronomy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Preliminary Appl. and Evaluation Results. Lixiscope; p 15-18
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The Lixiscope concept (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A portable X-ray imagery instrument which utilizes a converter phosphor or scintillator to convert the X-ray image into visible light image is described. The potential medical as well as industrial applications of the Lixiscope are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Preliminary Appl. and Evaluation Results. Lixiscope; p 3-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    An analysis of the gust-induced overspeed trends of helicopter rotors (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Equations for analyzing the potential gust-induced overspeed tendency of helicopter rotors are presented. A parametric analysis was also carried out to illustrate the sensitivity of rotor angular acceleration to changes in rotor lift, propulsive force, tip speed, and forward velocity.
    Keywords: AERODYNAMICS
    Type: NASA-TP-1213 , AVRADCOM-TR-78-24 , L-12159
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Theoretical analysis of aerodynamic characteristics of two helicopter rotor airfoils (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analytical study was conducted to predict the aerodynamic characteristics of two helicopter rotor airfoils. Documentation of the predictive process covers the development of empirical factors used in conjunction with computer programs for airfoil analysis. Tables of lift, drag, and pitching-moment coefficient for each airfoil were prepared for two dimensional, steady flow conditions at Mach numbers from 0.3 to 0.9 and Reynolds numbers of 7,700,000 to 23,000,000, respectively.
    Keywords: AERODYNAMICS
    Type: NASA-TM-78680
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A combined potential and viscous flow solution for V/STOL engine inlets (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A potential flow routine and a viscous boundary layer routine have been combined into a single routine for estimating the flow in and around subsonic inlets. In this combined routine, the viscous flow solution about the inlet body is obtained by adding the viscous displacement thickness to the inlet geometry. Combination of the two flow solutions has resulted in cost savings, both in preparation time and in computer time. This routine is a useful tool in optimizing lip shapes for V/STOL inlets. The method of combining the routine, comparison with NASA test data, and utilization of the routine for V/STOL inlet design are presented.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 78-142 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
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