A Hydropower Station Energy Dissipation Shape Optimization Test

2013 ◽  
Vol 477-478 ◽  
pp. 825-828
Author(s):  
Yang Chen ◽  
Bole Jiang ◽  
Hui Chen
Keyword(s):  
Energy Dissipation ◽  
Power Plant ◽  
Flow Rate ◽  
Side Wall ◽  
Hydropower Station ◽  
Body Type ◽  
Fluctuating Pressure ◽  
Exit Side ◽  
Stilling Basin ◽  
Flood Discharge

In this study, hydraulic model testing is used to optimize the flood discharge and energy dissipation body type of some power plant. Compared from the flow regime, bottom velocity, dynamical pressure and so on, it is found that the fluctuating pressure and bottom velocity at the exit side wall stilling pool bottom, are impoved by surface outlet contraction and intermediate outlet contraction, the largest bottom flow rate of surface outlet is about 13.6m/s, the maximum fluctuating pressure of stilling basin is approximately 6.7×9.81kPa. The problem of large bottom flow rate and fluctuating pressure are solved by this testing result, the result provided references for design.

Experimental Research on Structure of Surface Orifice Flood Discharge and Energy Dissipation of Hydropower Station with Large Discharge

2012 ◽  
Vol 212-213 ◽  
pp. 1048-1056
Author(s):  
Jing Li ◽  
Bo Le Jiang
Keyword(s):  
Energy Dissipation ◽  
Hydropower Station ◽  
Design Flood ◽  
Structure Pattern ◽  
Flow Energy ◽  
Flood Discharge ◽  
Guide Wall ◽  
Energy Dissipation Capacity ◽  
Large Discharge ◽  
Structure Layout

Normally, it is much complicated and difficult to design flood discharge and energy dissipation with large discharge. In this paper, twelve designed schemes of a curtain hydropower station were compared and analyzed repeatedly. It provides better reference scheme for engineering design. On weir surface and middle orifice local hydraulic model with geometry scale of 1:60, the writer tested and researched on energy dissipation capacity ,velocity and flow pattern, pressure distribution and related hydraulics problems of the curtain hydropower station discharging structure layout. Basically practicable discharging structure pattern and stilling pool pattern were put forward, through comparison and optimization of more than ten schemes. The study result showed that the surface orifice adapting proper pattern of flaring gate pier was favorable to increase the energy dissipation efficiency and shorten the length of stilling pool, but had no effect on the phenomenon of water wing hitting both sides of guide wall caused by flaring gate pier, the schemes of canceling flaring gate pier of surface orifice and adapting the declined pattern stilling pool could decrease the stilling pool floor plate velocity of under flow energy dissipation efficiently ,at the same time diminish the phenomenon of water wing hitting guide wall on both sides caused by flaring gate pier and obtain certain satisfying energy dissipation effect, moreover it had much heuristic and inspirational effect on similar projects.

scholarly journals Research on Design and Operation Method of Dewater and Filled System for Cushion Pool of High Dams ——Taking the project of BHT hydropower plant in China as an example

2021 ◽  
Vol 248 ◽  
pp. 03066
Author(s):  
Fang Jie ◽  
Cao Chunjian ◽  
Li Shengbing
Keyword(s):  
Energy Dissipation ◽  
Water Level ◽  
Electric Energy ◽  
Hydropower Plant ◽  
Hydropower Station ◽  
Flood Discharge ◽  
Filling System ◽  
Filling Device ◽  
Large Water ◽  
High Dams

Dam is set in large hydropower station. Cushion pool is built behind the dam for the flood discharge and energy dissipation of the reservoir. Operation of flood discharge and energy dissipation for some time, Cushion pool is dewatering and structure safety of which is study, then cushion pool is filled. Temporary dewater and filled system is used by previous engineer, but is arranged and controlled hard. Based on need of the cushion pool dewatering and filling, for an example of Baihetan hydropower station, necessity and feasibility are study. Then a permanent dewatering and filling system is designed for cushion pool. Design principle and arrange method are described. Many technical difficulties are study and resolved such as effect of valley deformation on the control system of dewatering and filling, demand of dewatering and filling device parameter, performance quota formulate based on large water level amplitude, protective measures in the working condition of much silt on the downstream and humidity in the equipment room of the second-dam and project of dewater drainage outlet under the water. By gravity drainage and filling based on water level difference and pump drainage, much electric energy is saved and personnel operating environment and working conditions are improved.

Hydraulic Model Experimental Research of SUE Hydropower Station

2013 ◽  
Vol 726-731 ◽  
pp. 3554-3558
Author(s):  
Qin Xiang Wang ◽  
Wan Qiang Chu
Keyword(s):  
Energy Dissipation ◽  
Erosion Control ◽  
Hydraulic Model ◽  
Design Flow ◽  
Hydropower Station ◽  
Power Station ◽  
Stilling Basin ◽  
Guide Wall ◽  
Structure Layout

The research of Metamorphosis hydraulic model experiment which is designed on the base of gravity similarity and turbulent resistance similarity into SUE Hydropower Station shows the structure layout and design size of SUE Hydropower Station are reasonable and overflow capacity of sluice can meet the requirements. Upstream circular-arc concrete guide wing wall and the guide wall between downstream stilling basin and power station outlet can play a role of diversion and smoothing the flow pattern. When the flow is more than design flow, the effect of energy dissipation and erosion control of stilling basin is not good. In order to enhance the effect of energy dissipation and erosion control of stilling basin, the basin shall be lengthened and baffle piers shall be set in the stilling basin to assist energy dissipation.

scholarly journals Numerical Simulation of Imported Sediment in a Stilling Basin

2021 ◽  
Vol 9 ◽  
Author(s):  
Rui Wang ◽  
Peng Li ◽  
Zhanbin Li ◽  
Jianchun Han ◽  
Yubin Zhu
Keyword(s):  
Energy Dissipation ◽  
Mass Flow ◽  
Flow Rate ◽  
Two Phase Flow ◽  
Sediment Deposition ◽  
Dam Failure ◽  
Phase Flow ◽  
Two Phase ◽  
Stilling Basin ◽  
Unit Width

Sediment buildup at the bottom of a stilling basin can result in premature drainage of spillway structures and can even lead to dam failure in severe cases. Such failures pose ecological and human safety hazards to downstream areas. To evaluate the sudden discharge and potential dam failure associated with sediment buildup, we developed a two-dimensional two-phase flow simulation model built on a particle-based force balance equation. We compared the flow patterns and energy dissipation effects in the stilling basin at different inlet flows (2, 3, 4.5, and 6.75 m2/s), and the subsequent bottom deposition was compared across different sand discharge mass flow rates (0.1, 0.2, and 0.3 kg/s). The results show that the turbulent energy increased with the increasing inlet unit width flow rate. When more vortices were generated and the flow velocity was reduced significantly, the energy dissipation was more effective. The sediment deposition at the bottom of the stilling basin gradually increased with the decrease of inlet unit width flow and the decrease of the sediment mass flow rate. Meanwhile, at a fixed inlet shape, the change in inlet unit width flow had little effect on the maximum sedimentation height at the bottom of the basin. In addition, the average deposition rate at the bottom of the stilling basin was positively correlated with the inlet sedimentation concentration, and the correlation coefficient could be as high as 0.97. In this two-phase flow method, the error of the simulated value over the theoretical value was less than 10%. This simulation of sediment deposition at the bottom of the stilling basin provides a practical reference for dam managers.

scholarly journals Numerical Study of Fluctuating Pressure on Stilling Basin Slab with Sudden Lateral Enlargement and Bottom Drop

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 238
Author(s):  
Yangliang Lu ◽  
Jinbu Yin ◽  
Zhou Yang ◽  
Kebang Wei ◽  
Zhiming Liu
Keyword(s):  
Velocity Gradient ◽  
Numerical Study ◽  
Side Wall ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
Fluctuating Pressure ◽  
Stilling Basin ◽  
Eddy Simulation ◽  
3D Software ◽  
Les Model

A stilling basin with sudden enlargement and bottom drop leads to complicated hydraulic characteristics, especially a fluctuating pressure distribution beneath 3D spatial hydraulic jumps. This paper used the large eddy simulation (LES) model and the TruVOF method based on FLOW-3D software to simulate the time-average pressure, root mean square (RMS) of fluctuating pressure, maximum and minimum pressure of a stilling basin slab. Compared with physical model results, the simulation results show that the LES model can simulate the fluctuating water flow pressure in a stilling basin reliably. The maximum value of RMS of fluctuating pressure appears in the vicinity of the front of the stilling basin and the extension line of the side wall. Based on the generating mechanism of fluctuating pressure and the Poisson Equation derived from the Navier–Stokes Equation, this paper provides a research method of combining quantitative analysis of influencing factors (fluctuating velocity, velocity gradient, and fluctuating vorticity) and qualitative analysis of the characteristics of fluctuating pressure. The distribution of fluctuating pressure in the swirling zone of the stilling basin and the wall-attached jet zone is mainly affected by the vortex and fluctuating flow velocity, respectively, and the distribution in the impinging zone is caused by fluctuating velocity, velocity gradient and fluctuating vorticity.

scholarly journals Off-Design Dynamic Performance Analysis of a Solar Aided Coal-Fired Power Plant

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2950
Author(s):  
Vinod Kumar ◽  
Liqiang Duan
Keyword(s):  
Power Plant ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Dynamic Performance ◽  
Feed Water ◽  
Saving Rate ◽  
Coal Consumption ◽  
Dynamic Performance Analysis

Coal consumption and CO2 emissions are the major concerns of the 21st century. Solar aided (coal-fired) power generation (SAPG) is paid more and more attention globally, due to the lesser coal rate and initial cost than the original coal-fired power plant and CSP technology respectively. In this paper, the off-design dynamic performance simulation model of a solar aided coal-fired power plant is established. A 330 MW subcritical coal-fired power plant is taken as a case study. On a typical day, three various collector area solar fields are integrated into the coal-fired power plant. By introducing the solar heat, the variations of system performances are analyzed at design load, 75% load, and 50% load. Analyzed parameters with the change of DNI include the thermal oil mass flow rate, the mass flow rate of feed water heated by the solar energy, steam extraction mass flow rate, coal consumption, and the plant thermal efficiency. The research results show that, as DNI increases over a day, the coal saving rate will also increase, the maximum coal saving rate reaches up to 5%, and plant thermal efficiency reaches 40%. It is analyzed that the SAPG system gives the best performance at a lower load and a large aperture area.

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