Fixed-Cone Valve Prototype Tests, New Melones Dam, California

摘要

The report presents the results of tests conducted subsequent to those discussed in US Army Engineer Waterways Experiment Station Technical Report HL-83-2 dated February 1983. The purpose of the tests was to obtain data at a higher pool elevation to: (a) determine the dynamic response of the 78-in.-diam fixed-cone valve and 18-ft-diam hood, (b) determine the probability of valve fatigue-type failure under prolonged operation, and (c) compare results with those of the earlier (basic) tests and model tests. Results of the data reduction include information on discharge characteristics of the fixed-cone valve, evaluations of pressure fluctuations in the valve and hood, vibration responses of the valve and hood, and strain measurements on the valve test vane. The acceleration data revealed no significant changes due to the increase in pool elevation. Mean pressure values in the valve and hood increased as a result of the increase in total head, No negative pressures were recorded. Imposed limitation of the total sleeve travel to a maximum of 28.1 in. prevented the occurrence of a flow control shift.