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  • 1
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    Effects of turbulence on vortex shedding from circular cylinders (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Wind and water tunnel apparatus and techniques for free stream turbulent effects on time-dependent forces acting on circular cylinders
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Sound radiation from a subsonic rotor subjected to turbulence (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The broadband sound radiated by a subsonic rotor subjected to turbulence in the approach stream has been analyzed. The power spectral density of the sound intensity has been found to depend on a characteristic time scale-namely, the integral scale of the turbulence divided by the axial flow velocity-as well as several length-scale ratios. These consist of the ratio of the integral scale to the acoustic wavelength, rotor radius, and blade chord. Due to the simplified model chosen, only a limited number of cascade parameters appear. Limited comparisons with experimental data indicate good agreement with predicted values.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Fluid Mech., Acoustics, and Design of Turbomachinery, Pt. 2; p 493-512
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Design of a separating high-altitude probe. (1964)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Ionospheric electron density studied by separating high altitude probe
    Keywords: SPACE VEHICLES
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Determination of critical nondimensional parameters in aircraft dynamic response to random input (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The critical parameters of subsonic jet aircraft response in a random atmospheric environment are determined. Equations of motion are presented for semirigid aircraft with a flexible primary airfoil. However, the analysis is easily extendable to include additional appendage flexibility. The analysis establishes the mechanical admittance values for pitching, plunging, and the first mode effects from wing elastic bending and torsion. Nondimensional parameters are established which allow the representation of all subsonic jet transport aircraft with one nondimensional model. The critical parameters for random forcing are found to be aircraft relative mass, reduced natural and forcing frequencies, and Mach number. Turbulence scale lengths are found to be directly related to the critical values of reduced forcing frequency. Results are given for subsonic craft traveling at constant altitude. Specific values of admittance functions are tabulated at Mach numbers of 0.2, 0.5, and 0.7. The relative mass range covers all aircraft currently in operation.
    Keywords: METEOROLOGY
    Type: NASA-CR-2361
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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