Abstract
The flow-induced coupled-mode self-excited vibration of huge Tainter gates were theoretically analyzed, and it was confirmed the validity by the model experiments. However, the experimental results have suggested that the instantaneous flow-rate coefficient does not correspond to 1:1 to vibration of a gate. Therefore, in order to clarify the characteristic of the instantaneous discharge flow from the gate bottom, we had many experiments. However, there was a problem on measurement accuracy in response to the influence of the contraction flow. This paper present the test results for variations in flow rate from the gate bottom. The instantaneous discharge velocity caused by the gate vibration was measured at the down-stream rather than the gate bottom, by LDV. The characteristics of instantaneous discharge flow were examined in detail, and the dependability of gate opening was also examined.
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