This paper presents a report on the results of experiments into the instability of a cavitating inducer, which is considered to be closely related to the POGO phenomena in liquid propellant rockets. The present experiment employed a high speed camera for visual observations. The dynamic pressure of both the inducer upstream and downstream was measured. The difference between rotatingcavitation and cavitation induced low cycle oscillations was examined. The cavities rotated around the periphery of the inducer low cycle oscillations was examined. The cavities rotated around the periphery of the inducer inlet with the constant rotating speed in rotating cavitation, while the cavities oscillated almost in unison in the cavitation induces low cycle oscillation. This suggests that the low cycle oscillation is a system oscillation. The high speed movie films showed the rotating cavitation process and the probability of a higher rotating cavitating zone velocity than that of the inducer blades. Rotating cavitation with very low cycle cavity oscillation for each blade and steady asymmetric cavitation were also presented. In addition, the paper illustrates how the types of cavitation vary with a change of inducer inlet pressure.
An experimental investigation of cavitating inducer instability
Experimentelle Untersuchung der induzierten Kavitation
ASME-Papers ; 1-12
1977
12 Seiten, 16 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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