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  • 1
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    Materials and construction techniques for cryogenic wind tunnel facilities for instruction/research use (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of the cryogenic wind tunnel program conducted at NASA Langley Research Center are presented to provide a starting point for the design of an instructional/research wind tunnel facility. The advantages of the cryogenic concept are discussed, and operating envelopes for a representative facility are presented to indicate the range and mode of operation. Special attention is given to the design, construction and materials problems peculiar to cryogenic wind tunnels. The control system for operation of a cryogenic tunnel is considered, and a portion of a linearized mathematical model is developed for determining the tunnel dynamic characteristics.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-142955 , ME-75-1-SFM/ATR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of a turbulent boundary layer over a moving ground plane (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Four methods of predicting the integral and friction parameters for a turbulent boundary layer over a moving ground plane were evaluated by using test information obtained in 76.2- by 50.8-centimeter tunnel. The tunnel was operated in the open sidewall configuration. These methods are (1) relative integral parameter method, (2) modified power law method, (3) relative power law method, and (4) modified law of the wall method. The modified law of the wall method predicts a more rapid decrease in skin friction with an increase in the ratio of belt velocity to free steam velocity than do methods (1) and (3).
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-6788 , L-7872
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Turbulent boundary layers over nonstationary plane boundaries (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Methods of predicting integral parameters and skin friction coefficients of turbulent boundary layers developing over moving ground planes were evaluated. The three methods evaluated were: relative integral parameter method; relative power law method; and modified law of the wall method.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-74091 , L-11465
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Turbulent boundary layers over nonstationary plane boundaries (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Methods of predicting integral parameters and skin-friction coefficients of turbulent boundary layers developing over moving-ground-planes are evaluated using test information from three different wind tunnel facilities at the NASA Langley Research Center. These data include test information from the VSTOL tunnel which is presented for the first time. The three methods evaluated were: (1) relative integral parameter method, (2) relative power law method, and (3) modified law of the wall method. Methods (1) and (2) can be used to predict moving-ground-plane shape factors with an expected accuracy of + or - 10%. They may also be used to predict moving-ground-plane displacement and momentum thicknesses with lower expected accuracy. This decrease in accuracy can be traced to the failure of approximations upon which these methods are based to prove universal when compared with VSTOL tunnel test results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-148861 , ME-76-1-ATR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Turbulent-boundary-layer development on a moving ground belt of rough texture (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The equations presented can be used to predict the shape factor and the ratio of the momentum thickness to the relative momentum thickness with reasonable accuracy for a moving ground belt provided that the stationary quantities are known and the two following basic approximations are valid: (1) Shape factor based upon velocity relative to the ground belt is nearly independent of the ratio of belt velocity to free-stream velocity. (2) The ratio of moving-belt momentum thickness to stationary-belt momentum thickness is independent of the coordinate measured in the streamwise direction. In addition, the integral quantities, momentum thickness and displacement thickness, can be predicted for the moving ground belt by using an empirically determined polynomial whose coefficients will change with different belt roughnesses.
    Keywords: FLUID MECHANICS
    Type: NASA-TM-X-2515 , L-7845
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Growth of turbulent boundary layers over nonstationary boundaries (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Wind tunnel data are presented which show that the velocity distribution in a turbulent boundary layer above a moving ground plane can be represented as a power law. The flows under consideration are encountered in studies of shock waves near solid boundaries and of the near-field drag of tube vehicles. The two wind tunnels used in the experiment were equipped with moving ground belts and employed porous suction plates to remove the normal tunnel boundary layer. The layers studied are, therefore, assumed to originate at the leading edge of the belt.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA Journal; 12; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
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