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  • Fluid Mechanics and Thermodynamics
  • 2010-2014
  • 1985-1989  (4)
  • 1945-1949
  • 1940-1944  (1)
  • 1986  (4)
  • 1940  (1)
Collection
Keywords
Years
  • 2010-2014
  • 1985-1989  (4)
  • 1945-1949
  • 1940-1944  (1)
Year
  • 1
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    Applications of a Conservative Zonal Scheme to Transient and Geometrically Complex Problems (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A conservative zoning technique, wherein the flow field for a finite-difference calculation is divided into several regions to simplify grid generation, is discussed and is applied in the solution of a two-dimensional problem of complex topology. Calculations are performed on two zonal, or patched, grid systems for the supersonic flow over a double-airfoil configuration. The solution is smooth and continuous across the zonal interfaces, and shock waves pass through the boundaries without distortion. In addition, the time accuracy of the zonal boundary method is verified by a two-zone cylinder calculation with a stationary inner and a rotating outer mesh. The feasibility of the zonal approach for use in the solution of geometrically complex and unsteady problems is thus demonstrated.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Fluid Dynamics; Jun 25, 1984 - Jun 27, 1984; Snowmass, CO; United States|Computers and Fluids (ISSN 0045-7930); 14; 1; 43-58
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Circulation controlled rotor blade tip vent valve (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Inadvertent slot opening in a circulation controlled rotor due to plenum valve leakage is averted by venting duct pressure below a control minimum. A vent valve is disclosed.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Device and method for determining freezing points (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A freezing point method and device (10) are disclosed. The method and device pertain to an inflection point technique for determining the freezing points of mixtures. In both the method and device (10), the mixture is cooled to a point below its anticipated freezing point and then warmed at a substantially linear rate. During the warming process, the rate of increase of temperature of the mixture is monitored by, for example, thermocouple (28) with the thermocouple output signal being amplified and differentiated by a differentiator (42). The rate of increase of temperature data are analyzed and a peak rate of increase of temperature is identified. In the preferred device (10) a computer (22) is utilized to analyze the rate of increase of temperature data following the warming process. Once the maximum rate of increase of temperature is identified, the corresponding temperature of the mixture is located and earmarked as being substantially equal to the freezing point of the mixture. In a preferred device (10), the computer (22), in addition to collecting the temperature and rate of change of temperature data, controls a programmable power supply (14) to provide a predetermined amount of cooling and warming current to thermoelectric modules (56).
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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  • 4
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    Fuel cell crimp-resistant cooling device with internal coil (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A cooling assembly for fuel cells having a simplified construction whereby coolant is efficiently circulated through a conduit arranged in serpentine fashion in a channel within a member of such assembly. The channel is adapted to cradle a flexible, chemically inert, conformable conduit capable of manipulation into a variety of cooling patterns without crimping or otherwise restricting of coolant flow. The conduit, when assembled with the member, conforms into intimate contact with the member for good thermal conductivity. The conduit is non-corrodible and can be constructed as a single, manifold-free, continuous coolant passage means having only one inlet and one outlet. The conduit has an internal coil means which enables it to be bent in small radii without crimping.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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  • 5
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    Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils (1940)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: This preliminary investigation was made to study the hydrodynamic properties and general behavior of simple hydrofoils. Six 5- by 30-inch plain, rectangular hydrofoils were tested in the NACA tank at various speeds, angles of attack and depths below the water surface. Two of the hydrofoils had sections representing the sections of commonly used airfoils, one had a section similar to one developed Guidoni for use with hydrofoil-equipped seaplane floats, and three had sections designed to have constant chordwise pressure distributions at given values of the lift coefficient for the purpose of delaying the speed at which cavitation begins. The experimental results are presented as curves of the lift and drag coefficients plotted against speed for the various angles of attack and depths for which the hydrofoils were tested. A number of derived curves are included for the purpose of better comparing the characteristics of the hydrofoils and to show the effects of depth. Several representative photographs show the development of cavitation on the the upper surface of the hydrofoils. The results indicate that properly designed hydrofoil sections will have excellent characteristics and that the speed at which cavitation occurs may be delayed to an appreciable extent by the use of suitable sections.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-SR-158
    Format: application/pdf
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