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  • 1
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    Dynamics of cavitating cascades (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Brief accounts of the theoretical research conducted on the unsteady cavitation characteristics of liquid rocket engine turbopumps are reported. The objective is to produce estimates of the cavitation compliance and other unsteady characteristics which could then be used in analysis of the pogo instability. Blade cavitation is the particular pheonomenon which is investigated and line arized free streamline methods were employed in both quasistatic and complete dynamic cascade analyses of the unsteady flow. The simpler quasistatic analysis was applied to particular turbopumps but yielded values of compliances significantly smaller than those indirectly obtained from experiments. Reasons for this discrepancy are discussed. The complete dynamic analysis presents a new problem in fundamental hydrodynamics and, though the basic solution is presented, numerical results have not as yet been obtained.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-131415 , E-184.1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A note on the unsteady cavity flow in a tunnel (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The unsteady internal cavitating flow such as the one observed in a pump or a turbine is studied for a simple two-dimensional model of a base-cavitating wedge in an infinite tunnel and it is shown how the cavitation compliance can be calculated using the linearized free streamline theory. Numerical values are obtained for the limiting case of a free jet. Two important features are: First, the cavitation compliance is found to be of complex form, having additional resistive and reactive terms beyond the purely inertial oscillation of the whole channel in 'slug flow.' Second, the compliance has a strong dependence on frequency.
    Keywords: FLUID MECHANICS
    Type: ASME PAPER 73-WA/FE-8 , Winter Annual Meeting; Nov 11, 1973 - Nov 15, 1973; Detroit, MI
    Format: text
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    NASA TECHNICAL REPORTS
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