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 basi s to further body optimization and engineering application of discharge and dissipation facility.

Analysis of the Impact of Effective Length of Morning Glory Spillway on Its Performance (Numerical Study)

“…Investigating the flow of water in the non-sectoral morning glory spillway along with the sectors created in this research, one can show that, according to the nature of the problem, the discharge flow rate of the morning glory spillway is a function of the angle of the sector, the discharge coefficient and the height of the water passing over the spillway as seen in Eq. (5).…”

“…In this study, the geometric and hydraulic characteristics of several large dams with morning glory spillways were selected and the maximum outflow rates were extracted on each one as a case study. Then, using a physical model, five different geometric and hydraulic designs were applied [5].…”

Experimental Investigation on Free Surface Vortices Driven by Tangential Inlets

“…More generally, this phenomenon can affect any hydraulic intake causing important technical problems in industrial applications [1], [2]. The free surface vortex formation can reduce the performance of the hydraulic devices and even damage them if floating matters or gas bubbles are entrained in the flow.…”