Experimental and Numerical Investigation of the Position of Hydraulic Jump Formed by Flow Passing Under the Sluice Gate

Year 2024, , 988 - 1000, 15.09.2024

Ali Yıldız

https://doi.org/10.34248/bsengineering.1463296

Abstract

Sluice gates control the water level in the reservoir and transfer the excessive water above the reservoir capacity to the downstream side in a controlled manner with a certain discharge. The flow passing under a sluice gate can be in free or submerged flow conditions. In the case of free flow, when the flow regime is changed from subcritical to supercritical, hydraulic jump occurs after the gate. The location of the hydraulic jump must be known to prevent the damage caused by the hydraulic jump to hydraulic structures and the channel. In this study, a sluice gate and a linear weir were used to create a hydraulic jump in the rectangular open channel system. The relation of the position of the hydraulic jump with discharge and gate opening was examined. Two different gate openings (e1 = 2.5 cm and e2 = 5 cm) were used in the experiments and experiments were carried out for 34 different discharge values. It has been observed that the hydraulic jump position changes linearly with the discharge. In addition, 2-dimensional numerical models of the physical experimental setups were created, and the hydraulic jump positions and flow depths obtained from the experiments were compared with the numerical models. According to the results obtained from numerical model and physical model showed a consistency of 92.22% for e1 = 2.5 cm gate opening and 95.69% for e2 = 5 cm gate openings.

Keywords

Sluice gate, Fluent, Computational fluid dynamics, Free hydraulic jump

Bent Kapağı Altından Geçen Akımın Oluşturduğu Hidrolik Sıçramanın Konumunun Deneysel ve Nümerik Olarak Belirlenmesi

Abstract

Bent kapakları, rezervuardaki su seviyesini kontrol edilmesini ve kapasitenin üzerindeki fazla suyun belli bir debi ile kontrollü bir şekilde mansap tarafına aktarılmasını sağlarlar. Bir bent kapağının altından geçen akım, serbest veya batmış akım durumda olabilir. Serbest akım durumunda kapak altından sel rejimiyle çıkan akım, nehir rejimine geçişinde, kapak sonrasında bir hidrolik sıçrama meydana getirir. Oluşan hidrolik sıçramanın, etraftaki yapılara ve bulunduğu kanala zarar vermemesi için hidrolik sıçrama konumunun tam olarak bilinmesi gerekmektedir. Bu çalışmada dikdörtgen kesite sahip bir açık kanal sisteminde, hidrolik sıçrama oluşturmak için bent kapağı ve doğrusal savak kullanılmıştır. Oluşan hidrolik sıçramanın konumunun, debi ve kapak açıklığı ile değişimi incelenmiştir. Deneylerde iki farklı kapak açıklığı (e1 =2,5 cm ve e2 =5 cm) kullanılmış ve 34 farklı debi değeri için deneyler yapılmıştır. Hidrolik sıçrama konumunun kapak açıklığına bağlı olarak farklı oranlarda, debi ile lineer değişim gösterdiği görülmüştür. Ayrıca fiziksel deney düzeneklerinin, 2-boyutlu nümerik modelleri oluşturulmuş ve deneylerden elde edilen hidrolik sıçrama konumları ve akım derinlikleri, nümerik modeller ile karşılaştırılmıştır. Elde edilen sonuçlara göre nümerik model ile fiziksel model, e=2,5 cm kapak açıklığı için %92,22 ve e=5 cm kapak açıklığı için %95,69 oranında tutarlılık göstermişlerdir.

Keywords

Bent kapakları, Fluent, Hesaplamalı akışkanlar dinamiği, Serbest hidrolik sıçrama

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