Abstract
The stabilities of the rigid models equipped with three different types of the lengths of throttle element in the inlet of leakage passage were examined experimentally and theoretically because the mechanism of the instability occurrence due to cavitating leakage flow was clarified. The experimental results of the damping ratio of the models could be explained the trend in the stability of the system in cavitating flow. The analytical equations would be valid as the calculated results of the damping ratio were in agreement with experimental results. Like the system in cavitating, flow, the self-excited vibrations occurred in the model, when the throttle element was located in near the center of the passage.
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