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  • AERODYNAMICS  (15)
  • Chemical Engineering
  • 1970-1974  (26)
  • 1
    Electronic Resource
    Electronic Resource
    Carbon dioxide-ethane phase equilibrium and densities from experimental measurements and the B-W-R equation (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 357-362 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Liquid composition-total pressure and liquid composition-liquid density data for the carbon dioxide-ethane system were measured at -31.7°, -17.8°, -3.9°, and 10.0°C (-25°, 0°, 25°, and 50°F ± 0.02°F), from 0 to 80 mole % CO2 at 10°C and 0 to 100% CO2 for the other isotherms. The Benedict-Webb-Rubin equation of state with a modified A0 mixing rule was used to correlate the composition-pressure data, with deviations in predicted pressures of only 0.8% average and 2% maximum. Vapor-liquid equilibrium compositions and component K values y/x were then predicted for this minimum boiling azeotrope system from 10° down to -56.7°C (50° to -70°F).
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690200223
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Feedforward computer control of a class of distributed parameter processes (1970)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 16 (1970), S. 754-761 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A finite difference technique has been developed which is suitable for the derivation of feedforward control algorithms for the control of distributed parameter processes. The method embodies both steady state and transient feedforward compensation.An experimental study, involving closed loop, on line, analogue computer control of a simple distributed parameter process proves the feasibility of the finite difference technique. The process under study is a steam water heat exchanger subject to inlet temperature forcing and controlled by flow rate manipulation. The new technique yielded significantly improved results when compared with the performance of a conventional two-mode feedback controller, or a linearized feedforward control algorithm.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690160513
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Calculation method for the response time to step inputs for approximate dynamic models of distillation columns (1972)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 1243-1252 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A calculation method to determine the response time to be used for approximate mathematical models is developed for the dynamic behavior of distillation columns. Previous work has shown that the concept of Inventory time can be successfully used to approximate the response time, that is, the 60% point of the step response, of distillation columns operating at a high degree of separation. A modified version of the inventory time method, based on the minimum change of storage, has been developed to predict the response time for other ranges of separation within reasonable bounds of error, ± 10%. Only steady state and design data were used. A rigorous nonlinear simulation generates the steady state and transient data upon which the approximate models are based.While the modified inventory time method developed cannot handle every possible operating condition with the desired degree of accuracy, it has been shown to apply over a much wider range of operating conditions than the original inventory time method.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690180623
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    Paper (German National Licenses)
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  • 4
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    Externally blown flap dynamic loads (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-27
    Description: Some of the principal results obtained in three series of measurements of fluctuating surface pressures induced on externally blown flaps by jet impingment are presented. Large- and small-scale models and hot- and cold-flow tests are considered. The discussion sets forth scaling parameters and consistent features of the root-mean-square values and spectra of the loading. Implications of these results with regard to sonic fatigue are indicated.
    Keywords: AERODYNAMICS
    Type: STOL Technol.; p 131-142
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Three-dimensional separation for interaction of shock waves with turbulent boundary layers (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: For the interaction of shock waves with turbulent boundary layers, obtained experimental three-dimensional separation results and correlations with earlier two-dimensional and three-dimensional data are presented. It is shown that separation occurs much earlier for turbulent three-dimensional than for two-dimensional flow at hypersonic speeds.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 11; Nov. 197
    Format: text
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  • 6
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    Starting criterion for hypersonic inlets (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Starting criterion for hypersonic inlets with large turbulent boundary layers, considering total pressure recovery from all shock and viscous losses
    Keywords: AERODYNAMICS
    Type: ; YSICA STATUS SOLIDI
    Format: text
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  • 7
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    Air Force Cambridge Research Laboratories balloon operations (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The establishment and functions of the AFCRL balloon operations facility are discussed. The types of research work conducted by the facility are defined. The facilities which support the balloon programs are described. The free balloon and tethered balloon capabilities are analyzed.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Telescope Systems for Balloon-Borne Res.; p 160-164
    Format: application/pdf
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  • 8
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    The influence of initial flow direction on the turbulent base pressure in supersonic axisymmetric flow (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Turbulent base pressure on conical afterbodies in supersonic axisymmetric flow, including initial direction effect
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 70-555 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, ATMOSPHERIC FLIGHT MECHANICS CONFERENCE; May 13, 1970 - May 15, 1970; TULLAHOMA, TN
    Format: text
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  • 9
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    Annular truncated plug nozzle flowfield and base pressure characteristics. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The flowfield and base pressure characteristics of an internal-external expansion, truncated plug nozzle are described over the pressure ratio range from 'open' wake to 'closed' wake conditions. The effect of plug length on these characteristics, including the process of wake 'closure' is also presented. An existing method for calculating the flowfield and base pressure, for 'closed' wake operation, is modified to include the internal shock wave generated near the shroud exit. The supersonic portion of the flow is calculated using rotational axisymmetric method of characteristics. The technique of Hartree is employed so that the downstream characteristic point locations can be chosen to fit the developing flowfield. An overexpansion technique is used to detect the internal shock wave in the vicinity of the shroud exit so that its effect on the plug base pressure could be determined. Good agreement between the analytical results and experimental data is obtained for 'closed' wake operations.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 73-137 , Aerospace Sciences Meeting; Jan 10, 1973 - Jan 12, 1973; Washington, DC
    Format: text
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  • 10
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    Longitudinal aerodynamic characteristics of the Viking lander capsule at Mach 6 (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Longitudinal aerodynamic characteristics of Viking lander spacecraft at hypersonic speed
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-2205 , L-7516
    Format: application/pdf
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