Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel

2011 ◽  
Vol 54 (S1) ◽  
pp. 33-39 ◽  
Author(s):  
ZhiPing Liu ◽  
Dong Zhang ◽  
HongWei Zhang ◽  
YiHong Wu
Keyword(s):  
Hydraulic Characteristics ◽  
High Head ◽  
Spillway Tunnel ◽  
Large Discharge

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.

Numerical Simulation of Ventilation Characteristics in a Hydropower Station Spillway Tunnel with High Head and Large Discharge

2014 ◽  
Vol 926-930 ◽  
pp. 3527-3530
Author(s):  
Hong Qing Zhang ◽  
Yi Long Lou ◽  
Wei Ping Xing ◽  
Jun Jun Tan
Keyword(s):  
Wind Speed ◽  
Hydropower Station ◽  
Aerated Flow ◽  
Speed Distribution ◽  
Vof Model ◽  
High Head ◽  
Spillway Tunnel ◽  
The Right ◽  
Ventilation Hole ◽  
Large Discharge

High wind speedandloudnoise usually occur in the hydropower station spillway tunnel, which will impact the producing environment of operators. In this paper, turbulent model and VOF modelwere combinedto simulate wind speed and the volume of ventilated airin ventilation holeandthreeaeratorsin the spillway tunnel on the right bank of a hydropower station in China. The results show thatVOF modelcan well simulate ventilated air induced by water drag, andthe volume of ventilated air in ventilation hole is the largest.Wind speed distribution on the longitudinal sectionof the inlet of ventilation hole is non-uniform,and loud noisewill occurthere. Wind speed on the left side of three aerators is higher than that on the right side. The results of the volume of ventilated airin threeaerators simulated by VOF modelare credible, but we should improve the VOF model to more accurately simulate aerated flow.

Analysis the Response of Aerated Flow Depth to the VOF Model

2014 ◽  
Vol 716-717 ◽  
pp. 767-770
Author(s):  
Hong Qing Zhang ◽  
Yi Long Lou ◽  
Qian Zhao ◽  
Wei Kai Tan
Keyword(s):  
Water Depth ◽  
Empirical Formula ◽  
Maximum Deviation ◽  
Flow Depth ◽  
Turbulent Model ◽  
Aerated Flow ◽  
Vof Model ◽  
High Head ◽  
Spillway Tunnel ◽  
Large Discharge

In order to analysis the response of aerated flow depth to the VOF model, in this paper, we used VOF combining turbulent model to simulate aerated flow depth in a hydropower station spillway tunnel with high head and large discharge in China. The results show that aerated flow depth is slightly larger than the experiment water depth, but the maximum deviation are not greater than 5% (except the pile number 0+605.236 m). So, using empirical formula to converse the calculate value of water depth into aerated flow depth can make up for the defects of the VOF model which cannot directly get aerated flow depth of the cross section inside the spillway tunnel. But the section water depth can’t be obtained by empirical formula calculation value conversion when cavity exists in the spillway tunnel.

Comparative Analysis of Wind Speed in Ventilation Hole Simulated by VOF and Euler Model

2014 ◽  
Vol 624 ◽  
pp. 643-646
Author(s):  
Hong Qing Zhang ◽  
Xian Tang Zhang ◽  
Yi Long Lou ◽  
Wei Ping Xing
Keyword(s):  
Wind Speed ◽  
Outlet Section ◽  
Inlet Section ◽  
Two Phase ◽  
Vof Model ◽  
Wind Speed Distribution ◽  
Euler Model ◽  
Spillway Tunnel ◽  
Ventilation Hole ◽  
Large Discharge

In order to analysis the applicability of VOF and Euler models to simulate water-air two-phase flow, VOF model and Euler model, respectively combining turbulent model, were used to simulate wind speed in ventilation hole of working gate in a hydropower station spillway tunnel with high head and large discharge in China. The results show that the dragging force simulated by Euler model is much more effective than that simulated by VOF model, causing significant increase of airflow in ventilation hole. It is obviously that wind speed simulated by Euler model is more close to the measured one, which may also provide evidence for design of ventilation hole. So Euler model is a better method to simulate the characteristic of aerated flow than VOF model. Meanwhile, the maximum wind speed occur near the inlet of ventilation hole, and the maximum value of wind speed is close to 120 m/s, which can cause loud noise. And wind speed distribution on the inlet section and outlet section of ventilation hole is respectively the most non-uniform and uniform. The conclusions obtained can improve the design of ventilation hole.

Simulation and Experiments of Aerated Flow in Curve-Connective Tunnel with High Head and Large Discharge

2016 ◽  
Vol 14 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Shuai Li ◽  
Jian-min Zhang ◽  
Wei-lin Xu ◽  
Jian-gang Chen ◽  
Yong Peng ◽  
...  
Keyword(s):  
Aerated Flow ◽  
High Head ◽  
Large Discharge

Experimental Study on Hydraulic Characteristics of X-Shape Flaring Gate Pier and Deflecting Stilling Basin United Energy Dissipator

2013 ◽  
Vol 376 ◽  
pp. 279-283 ◽  
Author(s):  
Wang Ru Wei
Keyword(s):  
Flow Direction ◽  
Water Discharge ◽  
Pressure Fluctuations ◽  
Impact Pressure ◽  
Hydraulic Characteristics ◽  
Stilling Basin ◽  
Energy Dissipater ◽  
Average Impact ◽  
Large Discharge ◽  
Impact Region

In this paper, the hydraulic characteristics of X-shape flaring gate pier and deflecting stilling basin united energy dissipater are analyzed experimentally on a physical model for large discharge, such as time average impact pressure, close-to-bed velocity in stilling basin and pressure fluctuations. The results show that for large discharge, the deflecting region is the main impact region and the max impact pressure decays with increased water discharge. The close-to-bed velocity decays fast in deflecting stilling basin along the flow direction and for discharge of 14143 m3/s and 17743 m3/s, the max root-mean-square of pressure fluctuation are 2.48 and 2.39 respectively. So the X-shape flaring gate pier and deflecting stilling basin united energy dissipater is a relatively good flood discharge structures combination, which provides strong references for the design of energy dissipater in hydraulic engineering.

Study on Hydraulic Characteristics of the Dragon-Raise-Head Spillway Tunnel

2013 ◽  
Vol 748 ◽  
pp. 1095-1098
Author(s):  
Shu Guang Jing ◽  
Xue Ping Gao ◽  
Yun Peng Han
Keyword(s):  
Discharge Capacity ◽  
Smooth Curve ◽  
Head Loss ◽  
Flow State ◽  
Hydraulic Characteristics ◽  
Curve Section ◽  
Design And Optimization ◽  
Numerical Stimulation ◽  
Reconstruction Project ◽  
Spillway Tunnel

This study compared the hydraulic characteristics of the Dragon-Raise-Head spillway tunnel by using a 3-D turbulence model, taking one specific spill tunnel reconstruction project as an example. In the first place, we proved the feasibility of the numerical stimulation results by the hydraulic model test of the Dragon-Head-Raise spillway tunnel comparatively. Then we comapared discharge capacity, head loss and flow state of four inlet elevations of the Dragon-Raise-Head spillway tunnel. The results showed little influence of different inlet elevations on discharge capacity, head loss and flow state under the premise of smooth curve section. The study would provide evidence for the design and optimization of the Dragon-Raise-Head spillway tunnel.

MODELING THE HYDRAULIC CHARACTERISTICS OF DRAIN VALVE AND BURST FITTING OF AN AIRCRAFT ACCIDENT-RESISTANT FUEL SYSTEM

2020 ◽  
Vol 7 (3) ◽  
pp. 37-44
Author(s):  
KONSTANTIN NAPREENKO ◽  
◽  
ROMAN SAVELEV ◽  
ALEKSEY TROFIMOV ◽  
ANNA LAMTYUGINA ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic Resistance ◽  
Hydraulic Calculation ◽  
Fuel System ◽  
Hydraulic Characteristics ◽  
System A ◽  
Ansys Cfx ◽  
Calculation Results ◽  
Scale Experiment ◽  
Aircraft Accident

The article discusses methods for determining the hydraulic resistance of units of an accident-resistant fuel system. A detailed description of the need to create such fuel systems for modern helicopters is given. The development of such systems today is impossible without the use of the method of mathematical modeling, which allows to qualitatively solve problems arising in the design process. To obtain accurate research results, it is necessary to have a complete description of all elements and assemblies of the system. Methods for determining the hydraulic characteristics of AFS elements using the drag coefficient, reference literature and CFD codes are considered. As the investigated AFS units, a drain valve and burst fitting were studied in the article. A hydraulic calculation of these AFS elements ware performed, the simulation results are presented in the ANSYS CFX software package. Also as the calculation results of bursting fitting, the pressure distribution fields of full and static pressure, velocity and streamlines are also shown. An experimental setup for validating the results obtained using the mathematical modeling method is considered, as well as a methodology for conducting a full-scale experiment to determine the hydraulic resistance of the unit. Materials have been prepared for inclusion in a one-dimensional mathematical model of an accident-resistant fuel system.

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