Effect of approach channel shape on theformation of vortices at single-horizontal intakes

Download
2019
Sönmez, Can Metin
In an experimental setup of a water intake structure composed of a reservoir-pipe system, the formation of air-entraining vortices under symmetric flow conditions were investigated for different approach channel shapes. In the first set of the experiments the approach channel walls were kept parallel to each other and be perpendicular to the head-wall of the intake structure. In the following sets of the experiments these walls were located at different angles to the head-wall. A series of experiments were conducted on the model with varying approach channel shapes and a wide range of discharges to determine the critical submergences required for the formation of vortices. Consequently, the effect of the approach channel shape on the formation of air-entraining vortices were investigated. Experimental results show that critical submergence is mainly affected by Froude number and approach flow channel shapes. Moreover, a dimensionless equation, related with hydraulic and geometrical parameters, was obtained by using dimensional analysis for the critical submergence. Furthermore, empirical equations were derived to calculate critical submergence by using regression analysis. After that, simplified empirical equation was obtained by eliminating some of the dimensionless parameters. Furthermore, data obtained from the experiments and from the empirical equations are compared with each other’s.

Suggestions

Determination of critical submergence depth at horizontal intakes under asymmetric flow conditions
Göğüş, Mustafa; Köken, Mete; Haspolat, Emre (2015-07-03)
The purpose of the present study is to investigate the hydraulic conditions of air-entraining vortices under asymmetrical flow conditions and derive a general expression to determine the critical submergence depth required for the formation of these vortices at horizontal intake pipes. A series of experiments were conducted in a model composed of a concrete reservoir and intake pipe which was mounted horizontally to the reservoir. Three pipes of different diameters were tested with adjustable plexiglass sid...
Investigation of critical submergence at single and multiple- horizontal intake structures having air- entraining vortices
Gökmener, Serkan; Göğüş, Mustafa; Department of Civil Engineering (2015)
In this experimental study the variation of the critical submergence of air- entraining vortices with important flow and geometrical parameters were investigated at single and multiple- horizontal intake structures. In the scope of this study, three identical pipes of diameter Di=0.265 m were tested at a wide range of discharge with varying side wall clearances under symmetrical and asymmetrical approach flow conditions. Using dimensional analysis dimensionless equation was developed for critical submergenc...
Formation of air-entraining vortices at horizontal intakes without approach flow induced circulation
Göğüş, Mustafa; Köken, Mete (2016-02-01)
The aim of this experimental study is to investigate the effects of hydraulic parameters on the formation of air-entraining vortices at horizontal intake structures without approach flow induced circulation. Six intake pipes of different diameters were tested in the study. The intake pipe to be tested was horizontally mounted to the front side of a large reservoir and then for a wide range of discharges experiments were conducted and critical submergences were detected with adjustable approach channel sidew...
Effect of hydraulic parameters on the formation of vortices at intake structures
Baykara, Ali; Göğüş, Mustafa; Köken, Mete; Department of Civil Engineering (2013)
The aim of this experimental study was to investigate the hydraulic conditions at which air-entraining vortices would form in front of horizontal intakes and to determine the ways of eliminating the formation of these vortices by testing anti-vortex devices. For these reasons, a series of experiments were conducted in an experimental setup composed of a reservoir having the dimensions of 3.10 m x 3.10 m x 2.20 m and a pump connected to the intake pipe. Within the reservoir, between the concrete side walls a...
Determination of critical submergence depth at horizontal intakes
Haspolat, Emre; Göğüş, Mustafa; Köken, Mete; Department of Civil Engineering (2015)
The purpose of the study is to investigate the formation of air entraining vortices under both symmetrical and asymmetrical approach flow conditions in an experimental setup of a horizontal water intake structure composed of a reservoir-pipe system. To determine at which critical submergence the air entraining vortices forming; a series of experiments were conducted in the experimental setup with horizontal pipes of four different diameters. Approach channel side walls of the intake structure model are adju...
Citation Formats
C. M. Sönmez, “Effect of approach channel shape on theformation of vortices at single-horizontal intakes,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.