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Published June 1, 1976 | public
Journal Article Open

The Dynamic Transfer Function for a Cavitating Inducer


Knowledge of the dynamic performance of pumps is essential for the prediction of transient behavior and instabilities in hydraulic systems; the necessary information is in the form of a transfer function which relates the instantaneous or fluctuating pressure and mass flow rate at inlet to the same quantities in the discharge from the pump. The presence of cavitation within the pump can have a major effect on this transfer function since dynamical changes in the volume of cavitation contribute to the difference in the instantaneous inlet and discharge mass flow rates. The present paper utilizes results from free streamline cascade theory to evaluate the elements in the transfer function for a cavitating inducer and shows that the numerical results are consistent with the characteristics observed in some dynamic tests on rocket engine turbopumps.

Additional Information

Contributed by the Fluids Engineering Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS and presented at the Winter Annual Meeting, Houston, Texas, November 30-December 4, 1975. Manuscript received at ASME Headquarters August 15, 1975. Paper No. 75-WA/FE-16. The authors are indebted to the George Marshall Space Flight Center, Huntsville, Alabama for support under NASA Contract NAS 8-28046 and to Mr. L. Gross of NASA, Huntsville, Dr. S. Rubin of Aerospace Corporation and Dr. J. Fenwick of the Rocketdyne Division of Rockwell International for valuable suggestions and advice.


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