Numerical Simulation of Stepped Spillways with Front Step Deformation

Abstract

In order to solve the flood discharge problem of both small- and medium-sized warping dams in the Loess Plateau, a stepped spillway scheme, based on an ecological bag, to achieve full-section water flow and energy dissipation has been proposed in this paper. The hydraulic and energy dissipation characteristics of a stepped spillway layout scheme were studied using 3D numerical simulation. As the height of the dams is low and the spillways are short, the research has shown that the traditional single-step layout scheme leads to a low overall energy dissipation rate due to the small amount of energy dissipated in the initial steps. As a result of this, this paper has put forward two kinds of step layout schemes such as the shunt type and the staggered type for the initial steps. Through analysis of the flow state, the pressure distribution, and the total energy dissipation rate, the results have shown that shunt type and staggered type with front step deformation produced an obvious mixing of the water flow, fewer negative pressure areas, and a higher energy dissipation rate. The optimal energy dissipation rate of the staggered type reached 87.75%, and the maximum energy dissipation rate was increased by 27.97%.

Capacity of second spillway of Boguchanskaya HPP

“…Using dependence (14), the total flow rate was calculated for all water discharge openings of spillway No. 2 in the head range from 19 to 10.5 m. The results of these calculations are graphically provided in Figure 6 as curves for spillway No.…”

“…Considering the impact on the downstream flow regime, this method of flow regulation is the most preferred. However, from the point of view of the operation of cranes and hydro-mechanical equipment, this mode is much more In this mode, the required value of the gate opening height is determined by the formula (14) to determine the flow rate; it is flowing from under the gate.…”

“…The issues of designing spillway structures considered in papers [4][5][6][7][8][9][10][11][12][13][14][15][16] should also help in answering the questions about researching the need to improve the existing system of management and planning of hydropower plants within the framework of interacting power and water management systems, using the criteria of economic, social and ecological efficiency. And as indicated in [17], planning long-term power balances and increasing their feasibility should include forecast scenarios of water inflow into reservoirs for up to 1 year and their monthly adjustment, ensuring the safe operation of hydro-technical structures.…”

Performance of the Gomaspan Dam's Stepped Spillway Against Cavitation using CFDcity

“…The dams were examined under a single flow width of (2.5, 4.5, and 5.5) 𝑚 2 . 𝑠 −1 for the varied heights (Li et al 2021).…”

“…For this purpose, a computational fluid dynamics (CFD) code called FLUENT is used. To begin, the code was validated by applying it to the experiments work of (Li et al 2021), and the findings demonstrate great agreement between CFD and the aforementioned experimental data. Second, the algorithm is applied to the designed stepped spillway of the Gomaspan dam, and the cavity index is obtained at each step.…”