Hydraulic characteristics of rotational flow shaft spillway for high dams

Abstract

Flood discharge and energy dissipation of large-scale hydraulic and hydroelectric projects are two key technological issues in project planning, design and construction phases. Hydraulic characteristics research of new type high dam flood discharge and energy dissipation facility is one of the major research directions of high-speed hydraulic. To deal with problems of flood discharge and energy dissipation faced in large-scale hydraulic and hydroelectric projects development such as high dam, large discharge and narrow river valley and so on, this paper proposes a new internal rotational flow shaft spillway which suits high arch dam and analyzes the design criteria and size of each part. Discharge volume and ratio of energy dissipation verifications are conducted to the designed internal rotational flow shaft spillway through physical modeling test. Results show that this new discharge and dissipation facility has simple structure; stable discharge volume with good discharge capacity, high ratio of energy dissipation and its project investment is low. Besides, this paper also analyzes the discharge performance of this new discharge and dissipation facility and proposed its discharge function relational expression based on modeling test results. This project research can offer theoretical basis to further body optimization and engineering application of discharge and dissipation facility.