Hydraulic Performance of Circular Crested Triangular Plan Form Weirs

Noori, Bahzad M. A.; Aaref, Naeema

doi:10.1007/s13369-017-2566-3

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…An intensive study on the hydraulics of flow over triangle plan form sharp crested has been conducted by Noori and Aaref (2016) through testing different weir models concluding that discharge coefficient decreases with the increase of relative upstream water depth above crest presenting an empirical equation for the coefficient of discharge and they showed that small vertex angle weirs give higher magnification values and higher efficiency. Another study is presented by Noori and Aaref (2017) focusing on the performance improvement of triangular plan form weirs by circulating their weir crests through testing twenty-seven weir models in which the vertex angle, weir height and crest diameter are changed during the experimental work. Noori and Aaref (2017) showed that the discharge capacity can be increased by 138% compared to normal sharp crested weirs in case of weirs of vertex angle of 45 degrees, weir height of 15 cm and crest diameter of 2.54 cm, i.e., the ratio of crest diameter to weir height = 0.17.…”

Section: Review Of Literaturementioning

confidence: 99%

“…Another study is presented by Noori and Aaref (2017) focusing on the performance improvement of triangular plan form weirs by circulating their weir crests through testing twenty-seven weir models in which the vertex angle, weir height and crest diameter are changed during the experimental work. Noori and Aaref (2017) showed that the discharge capacity can be increased by 138% compared to normal sharp crested weirs in case of weirs of vertex angle of 45 degrees, weir height of 15 cm and crest diameter of 2.54 cm, i.e., the ratio of crest diameter to weir height = 0.17.…”

Section: Review Of Literaturementioning

confidence: 99%

“…A lot of data and information are not accessible for oblique, triangular, and circular planform sharp crested weirs, and there has not been much effort put into enhancing their performance. (Noori and Aaref. 2017).…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

Aaref

Noori

2021

juod

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The current research aims to get better performance and capacity of discharge of sharp crested oblique weirs by providing veins perpendicular to weir crest in order to deflect the water jet perpendicular to the weir axis. Seven weir models have been constructed and experimented in which the weir height and the oblique angle are kept constants as (P = 25cm) and (α = 40 o ), respectively, during the whole experimental work. Three oblique weir conditions are tested, the first one was testing oblique weir with no veins, while, the second condition was by providing one vein at the middle of crest length and changing vein height three times as (Pv = 25, 20 and 15cm) and the third condition studied was by providing two veins to the oblique weir. From the study of surface profiles, it was realized that the maximum X-distance for the water depth above crest to become horizontal was X = 4.93h from the center of oblique weir with no veins, while, X = 4.59h for oblique weir equipped with one vein and X = 4.93h for oblique weir equipped with two veins (h = upstream water depth above crest). The results of discharge coefficient showed that the ratio of vein height to oblique weir height (Pv/P) has a major role on increasing the discharge coefficient and it was observed that the ratio (Pv/P = 0.6) offers the best performance of the weir. A straightforward power equation is recommended for the relation of (Cd) with (h/P) for sharp crested oblique weir equipped with two veins with high correlation coefficient and low mean percentage error. The capacity of discharge of the oblique weir was increased by 69.6% for a weir equipped with one vein, while, the discharge capacity was increased up to 73.5% for a weir equipped with two veins. The limitations of this study are that testing one oblique angle and keeping the weir height as constant for the range of (h/P) between 0.08 and 0.32.

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Section: Review Of Literaturementioning

confidence: 99%

Section: Review Of Literaturementioning

confidence: 99%

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Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

Aaref

Noori

2021

juod

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“…They found that weirs with lower heights had higher capacity and better performance compared to those with higher heights. Authors in [15] experimentally examined the behavior of sharp crested triangular plan form weirs under free flow conditions using a range of weir models that varied in vertex angle and weir height. They found that the discharge coefficient decreases with an increase in the relative head above crest and that weirs with small vertex angles have low discharge coefficients.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of a Combined Oblique Cylindrical Weir and Gate Structure

Ibrahim

Jafer

Ali

2023

Eng. Technol. Appl. Sci. Res.

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In the present study, the effects of different oblique angles and diameters on the cylindrical weir and below a gate as a combined device have been studied experimentally. For this purpose, sixteen models of combined cylindrical weir-gate structures have been tested in a laboratory flume. These models had four different oblique angles α (300, 450, 600, and 900). For each angle, the diameter of cylindrical weir-gate changed four times (4, 7.3, 9, and 11cm). The results of all models indicate that the theoretical discharge (Qth) is inversely proportional to the ratio of diameter to height (D/h) and length to height (L/h). As the diameter increases and oblique angles decrease, the actual discharge (Qact) increases. A general expression was established linking Qth/g1/2h5/2 and the discharge coefficient Cd with D/h, L/h, and alfa. The discharge coefficient ranged from 0.55 to 0.99 for various oblique angles and decreased as the angle increased. A strong correlation was observed between the estimated and the calculated values.

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“…By examining the hydraulic performance of curved trapezoidal labyrinth overflows in plan, Crookston and Tullis (2012) found that the discharge coefficient of this type of overflow is a function of the ratio of the upstream water head to the height of the overflow. In a laboratory study, Noori and Aaref (2017) analyzed the performance of a circular-crowned labyrinth overflow. They observed that the discharge coefficient is a function of the water head upstream of the overflow, and that increasing the dimensionless parameter of the water head to the height of the overflow reduces the discharge coefficient.…”

Section: Introductionmentioning

confidence: 99%

Using soft computing and machine learning algorithms to predict the discharge coefficient of curved labyrinth overflows

Karami

Rezaei

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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This research aims to estimate the overflow capacity of a curved labyrinth using different intelligent prediction models, namely the adaptive neural-fuzzy inference system, the support vector machine, the M5 model tree, the least-squares support vector machine and the least-squares support vector machine-bat algorithm (LSSVM-BA). A total of 355 empirical data for 6 different congressional overflow models were extracted from the results of a laboratory study on labyrinth overflow models. The parameters of the upstream water head to overflow ratio, the lateral wall angle and the curvature angle were used to estimate the discharge coefficient of curved labyrinth overflows. Based on various statistical evaluation indicators, the results show that those input parameters can be relied upon to predict the discharge coefficient. Specifically, the LSSVM-BA model showed the best prediction accuracy during the training and test phases. Such a low-cost prediction model may have a remarkable practical implication as it could be an economic alternative to the expensive laboratory solution, which is costly and time-consuming.

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Hydraulic Performance of Circular Crested Triangular Plan Form Weirs

Cited by 7 publications

References 8 publications

Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

An Experimental Study of a Combined Oblique Cylindrical Weir and Gate Structure

Using soft computing and machine learning algorithms to predict the discharge coefficient of curved labyrinth overflows

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