Test on the Shape Schemes of Jilintai-I Hydropower Station Flood Discharge System

2012 ◽  
Vol 490-495 ◽  
pp. 2902-2905
Author(s):  
Wen Xin Zheng
Keyword(s):  
Local Structure ◽  
Hydropower Station ◽  
Shape Design ◽  
Test Results ◽  
Bottom Slope ◽  
Discharge System ◽  
Flood Discharge ◽  
Sudden Enlargement ◽  
Original Scheme ◽  
Spillway Tunnel

According to the original scheme, the surface spillway tunnel of the Jilintai-I hydropower station flood discharge system was designed to be arranged separately, but not to be combined with diversion tunnel; the radial gate of the lower level spillway tunnel was designed not to have the vertical drop and lateral sudden enlargement, and the discharge structures at oblique tunnel were designed to be cancelled. In this paper, through the test on the hydraulic model, the analysis on the test results and many advisory demonstrations, multiple modifications and optimizations are made for the shape design of the axis, bottom slope and local structure of bottom slope and local structure, and also an analysis is conducted on the test results of the main shape scheme of surface spillway tunnel, and then the related opinions and suggestions are proposed according to the existing problems. The way of the pressured vertical drop and lateral sudden enlargement was ultimately used in lower level spillway tunnel of the hydropower station flood discharge system. Also, in this paper, the author makes a hydraulic test on the main shape design of lower level spillway tunnel based on the original scheme, and then an analysis is conducted on the test results and a final scheme is proposed according to the actual problems.

Pressure Distribution of Pressure and Non-Pressure Sections of a Hydropower Station Spillway Tunnel

2014 ◽  
Vol 716-717 ◽  
pp. 244-247
Author(s):  
Hong Qing Zhang ◽  
Wei Kai Tan ◽  
Yi Long Lou ◽  
Qian Zhao
Keyword(s):  
Pressure Distribution ◽  
Model Experiment ◽  
Hydropower Station ◽  
Maximum Pressure ◽  
Turbulent Model ◽  
Sudden Drop ◽  
Sudden Enlargement ◽  
High Head ◽  
Spillway Tunnel ◽  
Large Discharge

In this paper, we used VOF combining turbulent model to simulate pressure distribution of pressure section and non-pressure section in a hydropower station spillway tunnel with high head and large discharge in China. The results show that in the pressure section of the spillway tunnel, the values of pressure of emergency gate slot, working gate and the pressing slope, getting from physical model experiment and numerical simulation, are all positive. While in the non-pressure section, the No.1、2、3 aerators of the sudden enlargement and sudden drop occur the maximum pressure. And at the back of the No.1、2、3 aerators, where the values of pressure are negative, forms cavity. The conclusions obtained can improve the design of spillway tunnel.

scholarly journals Study on Structure Design of Generator of Flood Discharge Tunnel with Level Swirling Flow

2021 ◽  
Vol 276 ◽  
pp. 02013
Author(s):  
Heng Zhou ◽  
Hui Li ◽  
Jing Liu ◽  
Xinlei Guo ◽  
Weiguo Wang ◽  
...  
Keyword(s):  
Swirling Flow ◽  
Yellow River ◽  
Water Pressure ◽  
Northwest China ◽  
Internal Force ◽  
Structure Design ◽  
Hydropower Station ◽  
Discharge Tunnel ◽  
Flood Discharge ◽  
Spillway Tunnel

Through the design of the Generator of the spillway tunnel, the safe operation efficiency of flood discharge tunnel with the level swirling flow is further improved. This paper takes the horizontal swirl spillway tunnel of Gongboxia Hydropower Station on the Yellow River as an example. First, the project hub facilities of the Gongboxia Hydropower Station are introduced. Moreover, the design of the gradient section and the spinning chamber section in the Generator is also studied. Based on the calculation scheme of structural mechanics, the internal force of the structure under various load combinations such as external water pressure and internal water pressure is calculated. According to Design Codes For Hydraulic Concrete Structure, the structural reinforcement is computed. These provide the basis for the design of the flood discharge tunnel with level swirling flow of large hydropower engineering facilities in Northwest China.

Numerical Simulation on Backwater Downstream of Aerators in Spillway Tunnel with Ultra-Low Frounde Number Flow

2013 ◽  
Vol 444-445 ◽  
pp. 539-543
Author(s):  
Li Qiang Chen ◽  
Jun Xing Wang ◽  
Yu Ting Chen
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Steep Slope ◽  
Hydropower Station ◽  
Bottom Slope ◽  
Circular Arc ◽  
Circular Arcs ◽  
Number Flow ◽  
Spillway Tunnel ◽  
Better Than

The backtracking of flow occurs easily in cavity of aeration step in spillway tunnel with a gentle bottom slope and ultra-low Frounde number, and this influences the intake of air, so combined with the spillway tunnel of Chang heba Hydropower Station, four bodily form of aeration steps are chosen to be studied by both numerical simulation and model test based on κ-ε turbulence model, they are continuous aeration step, U-type aeration step + local steep slope, continuous aeration step + circular arc type steep slope and continuous aeration step + ogee curve steep slope, the results show that, the downstream bottom slope of aeration step with suitable ogee curve or circular arcs can efficiently inhibit the backtracking of flow in continuous aeration step, and can efficiently eliminate hydrops in cavity and in the same time can improve the efficiency of aeration. Usually, the results of bottom slope with an ogee curve are better than that with a circular arc.

Creation and Manipulation of Complex Displacement Features During the Conceptual Phase of Design

1996 ◽  
Author(s):  
P. A. van Elsas ◽  
J. S. M. Vergeest
Keyword(s):  
Boundary Conditions ◽  
Surface Feature ◽  
Free Form ◽  
Shape Design ◽  
Surface Model ◽  
Test Results ◽  
Base Surface ◽  
Feature Design ◽  
Data Explosion ◽  
Free Form Surface

Abstract Surface feature design is not well supported by contemporary free form surface modelers. For one type of surface feature, the displacement feature, it is shown that intuitive controls can be defined for its design. A method is described that, given a surface model, allows a designer to create and manipulate displacement features. The method uses numerically stable calculations, and feedback can be obtained within tenths of a second, allowing the designer to employ the different controls with unprecedented flexibility. The algorithm does not use refinement techniques, that generally lead to data explosion. The transition geometry, connecting a base surface to a displaced region, is found explicitly. Cross-boundary smoothness is dealt with automatically, leaving the designer to concentrate on the design, instead of having to deal with mathematical boundary conditions. Early test results indicate that interactive support is possible, thus making this a useful tool for conceptual shape 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.

Deformation and Energy Absorption of Steel Square Tubes With Optimized Shape Design

2019 ◽  
Author(s):  
Xiaofang Liu ◽  
Ziwen Fang ◽  
Haifeng Hong ◽  
Jianran Wang ◽  
Yanwen Liu ◽  
...  
Keyword(s):  
Impact Force ◽  
Longitudinal Direction ◽  
Axial Direction ◽  
Shape Design ◽  
Test Results ◽  
Element Analysis ◽  
Railway Vehicles ◽  
Side Walls ◽  
Energy Absorbers ◽  
Energy Absorbing

Abstract Square crush tubes have been widely used as impact energy absorbers in automotive and railway vehicles. In this paper, a square tube with vertical plates and dents has been designed to increase the controllability and stability of crash performance. Vertical plates are welded perpendicularly to the side walls of the tube, which increase the transverse stiffness and ensure the tube crashes in longitudinal direction under impact not in ideal axial direction. Dents have been put on the side walls near the front end of the tube to ensure the collapse always start from the front and progress gradually to the end. To validate the design, finite element analysis (FEA) and various experiments has been conducted and evaluated. Firstly, the numerical simulations were carried out using the software LS-DYNA. Then, four specimens were manufactured and tested. The crash velocity, tube deformation and impact force showed great agreement between the simulations and test results. The number of tubes, tube wall thickness, cross-section, trigger plates and dents arrangement can be adjusted to meet the requirements of different applications. In one application, the energy absorbing device with four crush tubes provided progressive controlled collapse with energy absorbing capacity of 1.22MJ and impact force less than 4450kN. This robust crush tube design has been successfully applied in multiple railway vehicles and also has the potential to be applied in other industries such as automotive vehicles.

Test Results of the SMES System in the Ariuragawa Hydropower Station

1992 ◽  
pp. 1035-1038
Author(s):  
Osamu Katahira ◽  
Fumihiko Fukui ◽  
Hidehiko Okada ◽  
Tadao Ezaki ◽  
Kokichi Ogawa ◽  
...  
Keyword(s):  
Hydropower Station ◽  
Test Results
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