Abstract
An experimental study was conducted to suppress self-excited oscillation of collapsible tubes, where a steel rod was inserted from the downstream bend into a silicone rubber tube. It was found that rod insertion along the tube center was effective in suppressing self-excited oscillation and that insertion with offset from the center was ineffective in suppression. The principal effect of rod insertion is that the rod contacts the internal surface of the tube and prevents collapse when located at the tube center. This was clearly indicated in the measured tube law. Secondary effects are the release of negative pressure impulse and the reduction of jet velocity at the throat.
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