819 Self-Excited Vibration Tests of Air Supply Valve for Ring Follower Gate in Water Release Pipe System of Dam

Abstract

This paper presents the model test results of self-excited vibration of the air supply valve for the ring flower gate in the water release pipe system of dam. The water release pipe system has the main gate and the sub-gate. The sub-gate surely has air valve for inhalation of air. The intense self-excited vibration was occurred in the water release pipe system under practical use. The intense vibration occurred when the air valve was closed, while water was accumulated in the pipe system. Although it is thought that the water hammer generated in the upstream participated in this problem, the main reason is not clarified. In this study, the self excited vibration related to the actual problem was revealed, using the model of the water release pipe system and the air valve.