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  • Fluid Mechanics and Thermodynamics  (4)
  • 1960-1964
  • 1945-1949  (4)
  • 1946  (4)
  • 1
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    Investigation of Flow in a Centrifugal Pump (1946)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: The investigation of the flow in a centrifugal pump indicated that the flow patterns in frictional fluid are fundamentally different from those in frictionless fluid. In particular, the dead air space adhering to the section side undoubtedly causes a reduction of the theoretically possible delivery head. The velocity distribution over a parallel circle is also subjected to a noticeable change as a result of the incomplete filling of the passages. The relative velocity on the pressure side of the vane, which for passages completely filled with active flow would differ little from zero even at comparatively lower than normal delivery volume, is increased, so that no rapid reverse flow occurs on the pressure side of the vane even for smaller delivery volume. It was established, further, that the flow ceases to be stationary for very small quantities of water. The inflow to the impeller can be regarded as radial for the operating range an question. The velocity triangles at the exit are subjected to a significant alteration in shape ae a result of the increased peripheral velocity, which may be of particular importance in the determination of the guide vane entrance angle.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1089 , Mitteilungen des Hydraulischen Instituts der Technischen Hochschule; 4; 1-27
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An Analytical Investigation of the Heat Losses from a U.S. Navy K-Type Airship (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The heat losses from the envelope surface of a U.S. Navy K-type airship are evaluated to determine if the use of heat is a feasible means of preventing ice and snow accumulations on lighter-than-air craft during flight and when moored uncovered. Consideration is given to heat losses in clear air (no liquid water present in the atmosphere) and in probable conditions of icing and snow. The results of the analysis indicate that the amount of heat required in flight to raise the surface temperature of the entire envelope to the extent considered adequate for ice protection, based on experience with tests of heavier-than-air craft, is very large. Existing types of heating equipment which could be used to supply this quantity of heat would probably be too bulky and heavy to provide a practical flight installation. The heat requirements to provide protection for the nose and stern regions in assumed mild to moderate icing conditions appear to be within the range of the capacity of current types of heating equipment suitable for flight use. The amount of heat necessary to prevent snow accumulations on the upper surface of the airship envelope when moored uncovered under all conditions appear to be excessive for the heating equipment presently available for flight use, but could possibly be achieved with auxiliary ground heating equipment.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-SA6L20
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Investigation of Turbulent Mixing Processes (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: With water as driving medium and delivered medium in a device similar to a simple jet apparatus, the pressure and velocity fields of the mixing zone were explored with a pitot bar; the ratio of delivered to driving volume ranged between the values 0, 1, 2, and 4. An attempt was also made to analyze the mixing flow mathematically by integration of the equation of motion, with the aid of conventional formulas for the turbulent shearing stress, but this succeeded only approximately for the very simplified case that a driving jet is introduced in an unlimited parallel flow, while the pressure over the whole mixing field is assumed to be constant. In spite of these dissimilar assumptions for the theory and the experiment, the form of the measured and the computed velocity profiles indicates a very high degree of approximation. The pressure rise, which was approximated by Flugel's formulas, disclosed good agreement with the measured values.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1096 , Forschung auf dem Gebiete des Ingenieurwesens; 12; 1; 16-30
    Format: application/pdf
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  • 4
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    Flow Investigation with the Aid of the Ultramicroscope (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: On the basis of photographic pictures the laminar flow at a pipe inlet was measured and compared with other measurements and computational results. The test setup is described in detail, and a series of the pictures obtained for turbulent flow is given.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1109 , Forschung auf dem Gebiete des Ingenieurwesens; 8; Pt 1; 42-47
    Format: application/pdf
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