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  • 1985-1989  (3)
  • 1987  (3)
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  • 1985-1989  (3)
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  • 1
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    Unknown
    On the effect of cavitation on the radial forces and hydrodynamic stiffness of a centrifugal pump (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The asymmetric flow within a volute exerts a radial force on a centrifugal impeller. Experimental measurements of the radial forces on the impeller in the presence of cavitation are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Lewis Research Center Rotordynamic Instability Problems in High-Performance Turbomachinery, 1986; p 493-501
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Rotordynamic forces on centrifugal pump impellers (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The asymmetric flow around an impeller in a volute exerts a force upon the impeller. To study the rotordynamic force on an impeller which is vibrating around its machine axis of rotation, the impeller, mounted on a dynamometer, is made to whirl in a circular orbit within the volute. The measured force is expressed as the sum of a steady radial force and an unsteady force due to the eccentric motion of the impeller. These forces were measured in separate tests on a centrifugal pump with radically increased shroud clearance, a two-dimensional impeller, and an impeller with an inducer, the impeller of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine). In each case, a destabilizing force was observed over a region of positive whirl.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Conference on Fluid Machinery; Sept. 1987; Budapest; Hungary
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Unsteady diffuser vane pressure and impeller wake measurements in a centrifugal pump (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Unsteady surface pressure measurements on a vaned diffuser of a centrifugal pump, and wake measurements of the flow exiting a centrifugal impeller into a vaneless diffuser are presented. Frequency spectra and ensemble averages are given for the unsteady measurements. Two different impellers were used, the pump impeller of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine) and a two-dimensional impeller. The magnitude of the unsteady total pressure measured in the stationary frame at the impeller exit was found to be of the same order of magnitude as the total pressure rise across the pump. The magnitude of the unsteady diffuser vane pressures was observed to be significantly different on suction and pressure side of the vane, attaining its largest value on the suction side the leading edge while decreasing along the vane.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Conference on Fluid Machinery; Sept. 1987; Budapest; Hungary
    Format: text
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    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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