Prediction of downpull on closing high head gates

Date

2006-01-01

Author

Aydın, İsmail
DÜNDAR, Onur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

207
views

0
downloads

Downpull on tunnel gates installed in the intake structure of a hydroelectric power plant was studied experimentally using a hydraulic model. The pressure distribution on the gate lip surface was measured, and the lip downpull was evaluated by surface-area integration of the measured pressure distribution. An easy to use lip downpull coefficient was defined as a function of the lip angle and gate opening. The lip downpull coefficient function is linked to a one-dimensional mathematical model of unsteady flow in the intake-penstock system. The model is based on the integral energy and continuity equations. Overflow through the gate spacings is also included in the model to compute the water level in the gate shaft and to evaluate the downpull component on the top face of the gate. Time-dependent calculation of the total downpull force acting on a closing gate is exemplified. The total downpull is also measured by the direct weighing method for fixed and closing gates. Predictions of the mathematical model compare favorably with the downpull obtained from the direct weighing method.

Subject Keywords

Pressure distribution, Downpull, Hydraulic gate, Dams, Hydropower

URI

https://hdl.handle.net/11511/38869

Journal

JOURNAL OF HYDRAULIC RESEARCH

DOI

https://doi.org/10.1080/00221686.2006.9521733

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Prediction of downpull on high head gates using computational fluid dynamics Uysal, Mehmet Akış; Köken, Mete; Aydın, İsmail; Department of Civil Engineering (2014) For design purposes it is important to predict the downpull forces on the tunnel gates installed in the intake of a hydropower plant. In this study downpull forces on the gates are evaluated for different closure rates and for different gate lip geometries using computational fluid dynamics and the results are compared to an existing experimental study. Commercial ANSYS FLUENT software is used in the calculations. It is found that downpull coefficients obtained from computational study showed good agreement...
Numerical modelling of reinforced concrete pressure tunnels using the overlapping lattice method Işık, Gökberk; Tuncay, Kağan; Department of Earthquake Studies (2019) Pressure tunnels transmit water from the reservoir to the turbines of hydroelectric power plants. The computational studies conducted to understand the behavior and shed light on the design guides of pressure tunnels were scarcely validated with experimental data as experimental work on pressure tunnels is very limited. Recent experimental studies on reinforced concrete pressure tunnels carried out at Middle East Technical University (METU), for the first time, allow computational models to be validated wit...
Computational modelling of free surface flow in intake structures using flow 3D software Aybar, Akın; Aydın, İsmail; Department of Civil Engineering (2012) Intakes are inlet structures where fluid is accelerated to a certain flow velocity to provide required amount of water into a hydraulic system. Intake size and geometry affects the formation of flow patterns, which can be influential for hydraulic performance of the whole system. An experimental study is conducted by measuring velocity field in the hydraulic model of the head pond of a hydropower plant to investigate vortex formation. Vortex strength based on potential flow theory is calculated from the mea...
Development of a computer software for hydraulic design of small hydropower facility Alimoğlu, Emir; Yanmaz, A Melih; Bozkuş, Zafer; Department of Civil Engineering (2012) Run-of-river type hydroelectrical power plants are the facilities that use only the available flow on the river without storing it to generate electrical energy. These kind of facilities are composed of structural components such as diversion weir, conveyance line, forebay, penstock and power house. In this thesis, a computer program called “MiniHEPP Hydraulic Design” is developed in order to perform the hydraulic design of run-of-river type hydropower plants. This program which runs under the Windows opera...
Experimental Investigation of Flow Conditions over Cambasi Dam Spillway Altan Sakarya, Ayşe Burcu; Aydın, İsmail; Göğüş, Mustafa; Köken, Mete (2013-09-13) The entrance conditions, flow around the piers and the pressure distributions along the centerline and the side of the spillway channel for different discharges were investigated for Cambasi dam that will be constructed at the intersection of Kabali and Hamzabey rivers in Ordu District. Hydraulic model of the spillway was constructed at a length scale of 1/20, based on the Froude similarity. Additionally, the water depths and the velocities through the channel sections at different locations were investigat...

Citation Formats

İ. Aydın and O. DÜNDAR, “Prediction of downpull on closing high head gates,” JOURNAL OF HYDRAULIC RESEARCH, pp. 822–831, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38869.